CN111647802B - Preparation method of hot stamping component coated with aluminum-silicon alloy coating and product thereof - Google Patents

Preparation method of hot stamping component coated with aluminum-silicon alloy coating and product thereof Download PDF

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CN111647802B
CN111647802B CN202010394223.6A CN202010394223A CN111647802B CN 111647802 B CN111647802 B CN 111647802B CN 202010394223 A CN202010394223 A CN 202010394223A CN 111647802 B CN111647802 B CN 111647802B
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heating
heat
aluminum
percent
silicon alloy
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CN111647802A (en
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徐德超
张博明
李学涛
罗新龙
赵海峰
滕华湘
李润昌
王彭涛
徐海卫
于孟
蒋光锐
王海全
巫雪松
鲍成人
张环宇
李研
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Shougang Group Co Ltd
Shougang Jingtang United Iron and Steel Co Ltd
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Shougang Group Co Ltd
Shougang Jingtang United Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The invention belongs to the technical field of hot stamping forming, and particularly relates to a preparation method of a hot stamping component coated with an aluminum-silicon alloy coating, which comprises the following steps: smelting and continuously casting to obtain a steel plate blank, and processing to obtain strip steel; coating the strip steel with an aluminum-silicon alloy plating layer; treating the strip steel coated with the aluminum-silicon alloy plating layer to obtain a steel plate blank; then carrying out heat treatment and hot stamping quenching treatment in sequence to obtain the hot stamping component coated with the aluminum-silicon alloy plating layer; wherein the heat treating the steel plate blank comprises: placing the steel plate blank in a heat treatment furnace for heat treatment; the heat treatment furnace includes: a first heating and heat-preserving section, a second heating and heat-preserving section and a third heating and heat-preserving section. The invention effectively solves the problem of roller sticking and nodulation of the aluminum-silicon coating, and prolongs the service life of the roller; all heating and heat-preserving sections of the heat treatment furnace are reasonably distributed, so that the energy consumption is reduced, and the heat treatment cost is greatly saved.

Description

Preparation method of hot stamping component coated with aluminum-silicon alloy coating and product thereof
Technical Field
The invention belongs to the technical field of hot stamping forming, and particularly relates to a preparation method of a hot stamping component coated with an aluminum-silicon alloy plating layer and a product thereof.
Background
The steel plate with high strength and ultrahigh strength has important significance for the light weight of the automobile body. At present, with the increasing strength required for the steel for vehicle bodies, the plasticity of the steel for vehicle bodies is greatly reduced, the forming performance is also greatly reduced, and particularly, cracking and rebound are easily generated in the forming process of the steel, thereby seriously influencing the shape and the dimensional accuracy of a hot stamping component.
The hot stamping forming technology utilizes the characteristics of the steel plate that the plasticity is increased and the forming resistance is reduced at high temperature, the steel plate blank with lower initial strength is rapidly stamped and formed in a die with a cooling system after being heated at high temperature and is quenched and cooled, and the ultrahigh-strength hot stamping component with the strength of more than 1300 MPa can be obtained, so that the problems that the steel plate is easy to crack and has serious resilience in cold forming can be well solved. In addition, the aluminum-silicon coating has excellent corrosion resistance, and the aluminum-silicon coating can quickly diffuse with the matrix at high temperature due to the high melting point of aluminum, so that intermetallic compounds Fe-Al phase and Fe-Al-Si phase with high melting points are formed, the problem that a large amount of surface oxide skin is generated in the heating process of a hot stamping component without the coating can be well solved, the service life of a die is prolonged, and the production efficiency is improved.
Chinese patent CN101583486B discloses a preparation method of a coated stamping product, wherein the preparation method comprises the temperature and time of hot stamping, the temperature of the hot stamping is raised from room temperature to 700 ℃, and the heating rate is 4-12 ℃/s, so that the spot welding performance of a stamping part can be ensured. Chinese patent CN106466697A discloses a hot-stamped product coated with an aluminum or aluminum alloy plating layer and a manufacturing method thereof, wherein the method does not optimize the heat treatment process, and is prone to generate furnace roller nodulation and other problems, the single temperature is prone to cause energy waste, and in addition, the plating solution of the aluminum or aluminum alloy plating layer does not consider the technical effects brought by Mn, Cr and Ti elements.
In summary, in the prior art, in the method for preparing the hot stamping component coated with the plating layer, the accretion probability of the furnace roller is high, the service life of the roller is short, the temperature of the furnace area of the heating furnace is unreasonable to set, so that energy is wasted, and the obtained hot stamping component has poor mechanical property, coating property and corrosion resistance.
Disclosure of Invention
In view of the above problems, the present invention provides a method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer, and a product thereof. The preparation method can effectively solve the problem of roller sticking and nodulation of the aluminum-silicon coating, greatly reduces the nodulation probability of the roller of the heat treatment furnace, and prolongs the service life of the roller; meanwhile, the preparation method reasonably distributes each heating and heat-preserving section of the heat treatment furnace, reduces energy consumption and greatly saves heat treatment cost; the hot stamping component coated with the aluminum-silicon alloy coating obtained by the preparation method has complete coating and excellent mechanical property, coating property and corrosion resistance, and the preparation method better prevents the problem of excessive coarsening of crystal grains in the austenitizing process of the hot stamping component; the preparation method of the invention has no special requirements on the furnace atmosphere of the roller hearth type heat treatment furnace, and further saves the production cost.
The technical scheme of the invention for realizing the purpose is as follows:
the invention provides a preparation method of a hot stamping component coated with an aluminum-silicon alloy plating layer, which comprises the following steps: smelting and continuously casting to obtain a steel plate blank, and processing the steel plate blank to obtain strip steel; coating the strip steel with an aluminum-silicon alloy coating to obtain the strip steel coated with the aluminum-silicon alloy coating; treating the strip steel coated with the aluminum-silicon alloy plating layer to obtain a steel plate blank; sequentially carrying out heat treatment and hot stamping quenching treatment on the steel plate blank to obtain the hot stamping component coated with the aluminum-silicon alloy plating layer;
wherein the heat treating the steel plate blank comprises: placing the steel plate blank in a heat treatment furnace for heat treatment; the heat treatment furnace includes: a first heating and heat-preserving section, a second heating and heat-preserving section and a third heating and heat-preserving section (wherein the third heating and heat-preserving section is a complete austenitizing and heat-preserving section).
In one embodiment, in the method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to the present invention, the heat treatment furnace is a roller hearth heat treatment furnace;
wherein, when the thickness of the strip steel coated with the aluminum-silicon alloy coating is less than 1.2 mm, the heating temperature and the heat preservation time of the first heating and heat preservation section are limited in the range of an area ABCD (shown as the area ABCD in the attached figure 2 of the invention), and the area ABCD has the range of the heating temperature and the heat preservation time limited by A (600 ℃, 60 s), B (600 ℃, 120 s), C (750 ℃, 120 s) and D (750 ℃, 60 s); the heating temperature and the holding time of the second heating and holding section are limited within the range of the region EFGH (as shown by the region EFGH in the attached fig. 2 of the invention), and the region EFGH has the range of the heating temperature and the holding time limited by E (750 ℃, 100 s), F (850 ℃, 100 s), G (850 ℃, 20 s) and H (750 ℃, 20 s); the heating temperature and the holding time of the third heating and holding section are limited within the range of a region IJKL (as shown by the region IJKL in the attached figure 2 of the invention), and the region IJKL has the range of the heating temperature and the holding time limited by I (850 ℃, 100 s), J (975 ℃, 60 s), K (975 ℃, 20 s) and L (850 ℃, 40 s);
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is 1.2-1.7 mm, the heating temperature and the heat preservation time of the first heating and heat preservation section are limited within the range of an area abcd (shown as the area abcd in the attached figure 2 of the invention), and the area abcd has the ranges of the heating temperature and the heat preservation time limited by a (600 ℃, 60 s), b (600 ℃, 220 s), c (750 ℃, 120 s) and d (750 ℃, 60 s); the heating temperature and the holding time of the second heating and holding section are limited within the range of the region EFGH (as shown by the region EFGH in the attached fig. 2 of the invention), and the region EFGH has the range of the heating temperature and the holding time limited by E (750 ℃, 100 s), F (850 ℃, 100 s), G (850 ℃, 20 s) and H (750 ℃, 20 s); the heating temperature and the holding time of the third heating and holding section are limited within the range of a region IJKL (as shown by the region IJKL in the attached figure 2 of the invention), and the region IJKL has the range of the heating temperature and the holding time limited by I (850 ℃, 100 s), J (975 ℃, 60 s), K (975 ℃, 20 s) and L (850 ℃, 40 s);
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is more than 1.7 mm, the heating temperature and the heat preservation time of the first heating and heat preservation section are limited within the range of the area A 'B' C 'D' (as shown in the area A 'B' C 'D' in the attached figure 3 of the invention), and the area A 'B' C 'D' has the range of the heating temperature and the heat preservation time limited by A '(650 ℃, 100 s), B' (650 ℃, 240 s), C '(800 ℃, 240 s) and D' (800 ℃, 100 s); the heating temperature and the holding time of the second heating and holding section are limited within the range of the region E 'F' G 'H' (as shown in the region E 'F' G 'H' in the attached figure 3 of the invention), and the region E 'F' G 'H' has the range of the heating temperature and the holding time limited by E '(800 ℃, 180 s), F' (900 ℃, 180 s), G '(900 ℃, 60 s) and H' (800 ℃, 60 s); the heating temperature and the holding time of the third heating and holding section are limited within the range of the region I 'J' K 'L' (as shown in the region I 'J' K 'L' in the attached figure 3 of the invention), and the region I 'J' K 'L' has the range of the heating temperature and the holding time limited by I '(900 ℃, 100 s), J' (975 ℃, 60 s), K '(975 ℃, 20 s) and L' (900 ℃, 40 s).
In the scheme, the time for the strip steel with different thickness specifications to rise to the preset temperature in the same temperature furnace is not consistent, but the temperature of the preheating furnace is reasonably set according to different thicknesses so as to obtain the aluminum-silicon alloy coating with better quality.
In one embodiment, in the method for producing a hot-stamped component coated with an al-si alloy plating layer according to the present invention, the first heating and holding section and the second heating and holding section employ an incremental heating mode (i.e., the second heating and holding section has a higher temperature than the first heating and holding section); and the third heating and heat-preserving section adopts a lifting type heating mode with unfixed temperature.
In one embodiment, in the method for manufacturing a hot-stamped component coated with an aluminum-silicon alloy coating layer, when the thickness of the strip steel coated with the aluminum-silicon alloy coating layer is less than 1.2 mm, the heating temperature is 600-750 ℃ in the first heating and heat-preserving section, and the heat-preserving time is 60-120 s; in the second heating and heat-preserving section, the heating temperature is 750-850 ℃, and the heat-preserving time is 20-100 s; in the third heating and heat-preserving section, the heating temperature is 850-975 ℃, and the heat-preserving time is 20-100 s;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is 1.2-1.7 mm, the heating temperature is 600-750 ℃ in the first heating and heat-preserving section, and the heat-preserving time is 60-220 s; in the second heating and heat-preserving section, the heating temperature is 750-850 ℃, and the heat-preserving time is 20-100 s; in the third heating and heat-preserving section, the heating temperature is 850-975 ℃, and the heat-preserving time is 20-100 s;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is larger than 1.7 mm, in the first heating and heat-preserving section, the heating temperature is 650-800 ℃, and the heat-preserving time is 100-240 s; in the second heating and heat-preserving section, the heating temperature is 800-900 ℃, and the heat-preserving time is 60-180 s; in the third heating and heat-preserving section, the heating temperature is 900-975 ℃, and the heat-preserving time is 20-100 s.
In one embodiment, in the method for manufacturing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to the present invention, when the thickness of the steel strip coated with an aluminum-silicon alloy plating layer is less than 1.2 mm, the heating temperature is 630 ℃ and the holding time is 100 s in the first heating and holding section; in the second heating and heat-preserving section, the heating temperature is 790 ℃, and the heat-preserving time is 100 s; in the third heating and heat-preserving section, the heating temperature is 860 ℃, 850 ℃ and 860 ℃ in sequence, and the heat-preserving time is 30 s, 20 s and 30 s in sequence;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is 1.2-1.7 mm, the heating temperature is 740 ℃ and the heat preservation time is 120 s in the first heating and heat preservation section; in the second heating and heat-preserving section, the heating temperature is 830 ℃, and the heat-preserving time is 100 s; in the third heating and heat-preserving section, the heating temperature is 930 ℃ and 940 ℃ in sequence, and the heat-preserving time is 30 s and 30 s in sequence;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is more than 1.7 mm, the heating temperature is 730 ℃ in the first heating and heat-preserving section, and the heat-preserving time is 120 s; in the second heating and heat-preserving section, the heating temperature is 850 ℃, and the heat-preserving time is 80 s; in the third heating and heat-preserving section, the heating temperature is 930 ℃, 920 ℃ and 930 ℃ in sequence, and the heat-preserving time is 20 s, 20 s and 20 s.
In one embodiment, in the method for manufacturing a hot stamped member coated with an al-si alloy plating layer according to the present invention, the smelting and the continuous casting are performed to obtain a steel slab, and the steel slab is processed to obtain a strip steel, including: smelting and continuously casting to obtain a steel plate blank, and sequentially heating, hot rolling, coiling, acid washing and cold rolling the steel plate blank to obtain strip steel;
wherein, by mass percent, the steel slab comprises: 0.12 to 0.40 percent of C, 0.02 to 1.5 percent of Si, 0.02 to 1.5 percent of Al, 0.5 to 3.5 percent of Mn, 0.01 to 0.7 percent of Cr, 0.01 to 0.7 percent of Mo, 0.001 to 0.005 percent of B, less than or equal to 0.005 percent of S, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of N, less than or equal to 0.003 percent of O, and one or more than two of 0.01 to 0.15 percent of Ti, 0.01 to 0.15 percent of Nb and 0.01 to 0.15 percent of V (namely, one or more than two of 0.01 to 0.15 percent of Ti, 0.01 to 0.15 percent of Nb and 0.01 to 0.15 percent of V), and the balance of Fe and inevitable impurities; wherein, the content of (Cr + Mo) is more than or equal to 0.1 percent and less than or equal to 1.0 percent; 0.03 percent to 0.35 percent (Ti + Nb + V);
in a further preferred embodiment, in the method for producing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to the present invention, the steel slab comprises, in mass percent: 0.31% of C, 0.25% of Si, 0.76% of Al, 1.6% of Mn, 0.19% of Cr, 0.13% of Mo, 0.0027% of B, 0.0034% of S, 0.0033% of P, 0.005% of N, 0.003% of O, 0.035% of Ti and 0.13% of V, and the balance of Fe and inevitable impurities.
In one embodiment, in the method for preparing the hot stamping component coated with the aluminum-silicon alloy coating, the heating temperature is 1100-1280 ℃; the final rolling temperature of the hot rolling is 750-950 ℃; the coiling temperature is 500-700 ℃; the total rolling reduction rate of the cold rolling is 40-80%.
In one embodiment, the method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to the present invention, in which the strip steel is coated with the aluminum-silicon alloy plating layer to obtain the strip steel coated with the aluminum-silicon alloy plating layer, includes: annealing the strip steel, immersing the strip steel into an aluminum-silicon alloy plating solution in an aluminum-silicon pot for 2-20 s, and cooling at a cooling rate of 3-50 ℃/s to a temperature of less than or equal to 300 ℃ to obtain the strip steel coated with an aluminum-silicon alloy plating layer; and processing the strip steel coated with the aluminum-silicon alloy plating layer into a blank with the size required by a hot stamping component to obtain a steel plate blank.
Wherein the annealing treatment process comprises the following steps: heating the strip steel to the temperature of 720-850 ℃, preserving the heat for 1-5 min, and then cooling the strip steel to the temperature of 600-700 ℃ at the cooling rate of 5-50 ℃/s;
the temperature of the aluminum-silicon pot is 600-700 ℃;
the aluminum-silicon alloy plating solution comprises the following components in percentage by mass: 8-10% of Si, 0.001-0.1% of Ti, 2-2.6% of Fe, Mn and Cr; wherein, the content of (Mn + Cr) is more than or equal to 0.001% and less than or equal to 0.1%;
in a further preferred embodiment, in the method for producing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to the present invention, the aluminum-silicon alloy plating solution includes, in mass percent: 9 percent of Si, 0.01 percent of Ti, 2 percent of Fe, 0.07 percent of Mn0.01 percent of Cr.
In a further preferred embodiment, in the method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to the present invention, the aluminum-silicon alloy plating layer has a mass per unit area of 10 to 150 g/m2；
In a further preferred embodiment, in the method for producing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to the present invention, the steel strip coated with an aluminum-silicon alloy plating layer includes: a strip steel substrate and the aluminum-silicon alloy plating layer on at least one surface of the strip steel substrate.
In one embodiment, the method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to the present invention includes the steps of treating the aluminum-silicon alloy plating layer-coated steel strip to obtain a steel sheet blank, including: the strip steel coated with the aluminum-silicon alloy coating is sequentially subjected to finishing, straightening and rolling to obtain a steel coil; uncoiling and blanking the steel coil to obtain a steel plate blank;
in a further preferred embodiment, in the method for producing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to the present invention, the hot-stamping quenching process includes: and stamping the steel plate blank in a stamping and quenching die, cooling to 18-31 ℃ at a cooling rate of more than or equal to 20 ℃/s, and cooling for 3-15 s under the condition of pressure maintaining to obtain the hot stamping component coated with the aluminum-silicon alloy coating.
The invention also provides the hot stamping component coated with the aluminum-silicon alloy plating layer, which is prepared by the preparation method of the hot stamping component coated with the aluminum-silicon alloy plating layer;
in a further preferred embodiment, in the aluminum-silicon alloy plating layer-coated hot-stamped component according to the present invention, the aluminum-silicon alloy plating layer-coated hot-stamped component includes, in mass percent: 0.12 to 0.40 percent of C, 0.02 to 1.5 percent of Si, 0.02 to 1.5 percent of Al, 0.5 to 3.5 percent of Mn, 0.01 to 0.7 percent of Cr, 0.01 to 0.7 percent of Mo, 0.001 to 0.005 percent of B, less than or equal to 0.005 percent of S, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of N, less than or equal to 0.003 percent of O, and one or more than two of 0.01 to 0.15 percent of Ti, 0.01 to 0.15 percent of Nb and 0.01 to 0.15 percent of V (namely, one or more than two of 0.01 to 0.15 percent of Ti, 0.01 to 0.15 percent of Nb and 0.01 to 0.15 percent of V), and the balance of Fe and inevitable impurities; wherein, the content of (Cr + Mo) is more than or equal to 0.1 percent and less than or equal to 1.0 percent; 0.03 percent to 0.35 percent (Ti + Nb + V); in the formula in the scheme, symbols such as Cr, Mo, Ti, Nb, V and the like represent percentage content values.
The coating aluminum-silicon alloy plating layer comprises the following components in percentage by mass: 8-10% of Si, 0.001-0.1% of Ti, 2-2.6% of Fe, Mn and Cr; wherein, the content of (Mn + Cr) is more than or equal to 0.001% and less than or equal to 0.1%;
in a further preferred embodiment, in the aluminum-silicon alloy plating layer-coated hot-stamped component according to the present invention, the aluminum-silicon alloy plating layer-coated hot-stamped component includes, in mass percent: 0.31% of C, 0.25% of Si, 0.76% of Al, 1.6% of Mn, 0.19% of Cr, 0.13% of Mo, 0.0027% of B, 0.0034% of S, 0.0033% of P, 0.005% of N, 0.003% of O, 0.035% of Ti and 0.13% of V, and the balance of Fe and inevitable impurities.
In a further preferred embodiment, in the aluminum-silicon alloy plated coated hot stamped component according to the invention, the aluminum-silicon alloy plated coated layer comprises, in mass percent: 9 percent of Si, 0.01 percent of Ti, 2 percent of Fe, 0.07 percent of Mn0.01 percent of Cr.
The hot stamping component coated with the aluminum-silicon alloy plating layer has excellent mechanical properties, wherein the yield strength is 800-1400 MPa, the tensile strength is 1300-2000 MPa, and the elongation is more than or equal to 4%.
The aluminum-silicon alloy plating solution comprises the following components: the Mn element can prevent the recrystallization process of the aluminum alloy, thereby increasing the recrystallization temperature and remarkably refining recrystallized grains. Cr element can be formed in aluminum
Figure DEST_PATH_IMAGE002
And the intermetallic compounds can block the nucleation and growth process of recrystallization, and finally can improve the toughness of the aluminum-silicon alloy plating layer. Ti element is capable of forming with aluminum
Figure DEST_PATH_IMAGE004
The phase becomes a non-spontaneous core during crystallization, thereby improving the problem of grain coarsening of the aluminum-silicon alloy plating layer. Further, the inventors have found through research that too low Si content is liable to form an explosive structure, thereby affecting the performance of the aluminum-silicon alloy plating layer, but too high Si content affects the subsequent coating performance. In the present invention, when the Si content is more than 10.5%, the roughness of the resulting hot stamped member is too small (i.e., too smooth) and is not suitable for coating. The inventors have gone through a large number ofOptimizing a balance test, and finally setting the Si content in the aluminum-silicon alloy plating solution to be 8-10%, thereby realizing the excellent comprehensive performance of the aluminum-silicon alloy plating layer. In the invention, if the contents of Mn and Cr are too low, the effect of improving the grain size and the toughness is not facilitated, and if the contents of Mn and Cr are too high, the melting point of the molten aluminum is easily increased, so that the hot dipping efficiency is not facilitated and the energy is not facilitated to be saved.
One or more technical embodiments of the present invention have at least the following technical effects or advantages:
(1) the preparation method can effectively solve the problem of roller sticking and nodulation of the aluminum-silicon coating, greatly reduces the nodulation probability of the roller of the heat treatment furnace, and prolongs the service life of the roller; meanwhile, according to the preparation method, each heating and heat-preserving section of the heat treatment furnace is reasonably distributed according to the thickness of the strip steel coated with the aluminum-silicon alloy coating, the length of the roller-hearth heat treatment furnace and the number of actual production line furnace areas, so that the energy consumption is reduced, and the heat treatment cost is greatly saved; the hot stamping component coated with the aluminum-silicon alloy coating obtained by the preparation method has complete coating and excellent mechanical property, coating property and corrosion resistance, and the preparation method better prevents the problem of excessive coarsening of crystal grains in the austenitizing process of the hot stamping component; the preparation method of the invention has no special requirements on the furnace atmosphere of the roller hearth type heat treatment furnace, and further saves the production cost.
(2) The invention reduces the heat preservation time of the steel plate material at the temperature higher than the complete austenitizing temperature by reasonably distributing each heating heat preservation section of the roller-hearth heat treatment furnace, thereby preventing austenite grains from being coarsened excessively and improving the mechanical property of steel.
(3) The hot stamping component coated with the aluminum-silicon alloy plating layer has excellent mechanical properties, wherein the yield strength is 800-1400 MPa, the tensile strength is 1300-2000 MPa, and the elongation is more than or equal to 4%.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 shows surface defects of a hot-stamped member coated with an Al-Si alloy plating layer, which are caused by accretion of a furnace roll of a heat treatment furnace, when the member is produced by a conventional method;
FIG. 2 is a schematic view showing the ranges of the heating temperature and the holding time in the first heating and holding section, the second heating and holding section, and the third heating and holding section of the heat treatment furnace according to the present invention (when the thickness of the Al-Si alloy plating layer-coated steel strip is < 1.2 mm and when the thickness of the Al-Si alloy plating layer-coated steel strip is 1.2 to 1.7 mm);
FIG. 3 is a schematic view showing the ranges of heating temperature and holding time in the first heat-retaining section, the second heat-retaining section and the third heat-retaining section of the heat treatment furnace according to the present invention (when the thickness of the Al-Si alloy coated steel strip is more than 1.7 mm);
FIG. 4 is a cross-sectional view of a hot-stamped component coated with an Al-Si alloy plating layer, produced in example 1 of the present invention;
fig. 5 shows a schematic diagram of dividing a heating and heat-preserving section of a roller hearth heat treatment furnace in the preparation method of embodiment 1 of the present invention (where a temperature zone 1 is the first heating and heat-preserving section of the present invention, a temperature zone 2 is the second heating and heat-preserving section of the present invention, and a temperature zone 3 is the third heating and heat-preserving section of the present invention).
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
the invention provides a preparation method of a hot stamping component coated with an aluminum-silicon alloy plating layer, which comprises the following steps: smelting and continuously casting to obtain a steel plate blank, and processing the steel plate blank to obtain strip steel; coating the strip steel with an aluminum-silicon alloy coating to obtain the strip steel coated with the aluminum-silicon alloy coating; treating the strip steel coated with the aluminum-silicon alloy plating layer to obtain a steel plate blank; sequentially carrying out heat treatment and hot stamping quenching treatment on the steel plate blank to obtain the hot stamping component coated with the aluminum-silicon alloy plating layer;
wherein the heat treating the steel plate blank comprises: placing the steel plate blank in a heat treatment furnace for heat treatment; the heat treatment furnace includes: a first heating and heat-preserving section, a second heating and heat-preserving section and a third heating and heat-preserving section (wherein the third heating and heat-preserving section is a complete austenitizing and heat-preserving section).
In one embodiment, in the method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to the present invention, the heat treatment furnace is a roller hearth heat treatment furnace;
wherein, when the thickness of the strip steel coated with the aluminum-silicon alloy coating is less than 1.2 mm, the heating temperature and the heat preservation time of the first heating and heat preservation section are limited in the range of an area ABCD (shown as the area ABCD in the attached figure 2 of the invention), and the area ABCD has the range of the heating temperature and the heat preservation time limited by A (600 ℃, 60 s), B (600 ℃, 120 s), C (750 ℃, 120 s) and D (750 ℃, 60 s); the heating temperature and the holding time of the second heating and holding section are limited within the range of the region EFGH (as shown by the region EFGH in the attached fig. 2 of the invention), and the region EFGH has the range of the heating temperature and the holding time limited by E (750 ℃, 100 s), F (850 ℃, 100 s), G (850 ℃, 20 s) and H (750 ℃, 20 s); the heating temperature and the holding time of the third heating and holding section are limited within the range of a region IJKL (as shown by the region IJKL in the attached figure 2 of the invention), and the region IJKL has the range of the heating temperature and the holding time limited by I (850 ℃, 100 s), J (975 ℃, 60 s), K (975 ℃, 20 s) and L (850 ℃, 40 s);
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is 1.2-1.7 mm, the heating temperature and the heat preservation time of the first heating and heat preservation section are limited within the range of an area abcd (shown as the area abcd in the attached figure 2 of the invention), and the area abcd has the ranges of the heating temperature and the heat preservation time limited by a (600 ℃, 60 s), b (600 ℃, 220 s), c (750 ℃, 120 s) and d (750 ℃, 60 s); the heating temperature and the holding time of the second heating and holding section are limited within the range of the region EFGH (as shown by the region EFGH in the attached fig. 2 of the invention), and the region EFGH has the range of the heating temperature and the holding time limited by E (750 ℃, 100 s), F (850 ℃, 100 s), G (850 ℃, 20 s) and H (750 ℃, 20 s); the heating temperature and the holding time of the third heating and holding section are limited within the range of a region IJKL (as shown by the region IJKL in the attached figure 2 of the invention), and the region IJKL has the range of the heating temperature and the holding time limited by I (850 ℃, 100 s), J (975 ℃, 60 s), K (975 ℃, 20 s) and L (850 ℃, 40 s);
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is more than 1.7 mm, the heating temperature and the heat preservation time of the first heating and heat preservation section are limited within the range of the area A 'B' C 'D' (as shown in the area A 'B' C 'D' in the attached figure 3 of the invention), and the area A 'B' C 'D' has the range of the heating temperature and the heat preservation time limited by A '(650 ℃, 100 s), B' (650 ℃, 240 s), C '(800 ℃, 240 s) and D' (800 ℃, 100 s); the heating temperature and the holding time of the second heating and holding section are limited within the range of the region E 'F' G 'H' (as shown in the region E 'F' G 'H' in the attached figure 3 of the invention), and the region E 'F' G 'H' has the range of the heating temperature and the holding time limited by E '(800 ℃, 180 s), F' (900 ℃, 180 s), G '(900 ℃, 60 s) and H' (800 ℃, 60 s); the heating temperature and the holding time of the third heating and holding section are limited within the range of the region I 'J' K 'L' (as shown in the region I 'J' K 'L' in the attached figure 3 of the invention), and the region I 'J' K 'L' has the range of the heating temperature and the holding time limited by I '(900 ℃, 100 s), J' (975 ℃, 60 s), K '(975 ℃, 20 s) and L' (900 ℃, 40 s).
In the scheme, the time for the strip steel with different thickness specifications to rise to the preset temperature in the same temperature furnace is not consistent, but the temperature of the preheating furnace is reasonably set according to different thicknesses so as to obtain the aluminum-silicon alloy coating with better quality.
In one embodiment, in the method for producing a hot-stamped component coated with an al-si alloy plating layer according to the present invention, the first heating and holding section and the second heating and holding section employ an incremental heating mode (i.e., the second heating and holding section has a higher temperature than the first heating and holding section); and the third heating and heat-preserving section adopts a lifting type heating mode with unfixed temperature.
In one embodiment, in the method for manufacturing a hot-stamped component coated with an aluminum-silicon alloy coating layer, when the thickness of the strip steel coated with the aluminum-silicon alloy coating layer is less than 1.2 mm, the heating temperature is 600-750 ℃ in the first heating and heat-preserving section, and the heat-preserving time is 60-120 s; in the second heating and heat-preserving section, the heating temperature is 750-850 ℃, and the heat-preserving time is 20-100 s; in the third heating and heat-preserving section, the heating temperature is 850-975 ℃, and the heat-preserving time is 20-100 s;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is 1.2-1.7 mm, the heating temperature is 600-750 ℃ in the first heating and heat-preserving section, and the heat-preserving time is 60-220 s; in the second heating and heat-preserving section, the heating temperature is 750-850 ℃, and the heat-preserving time is 20-100 s; in the third heating and heat-preserving section, the heating temperature is 850-975 ℃, and the heat-preserving time is 20-100 s;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is larger than 1.7 mm, in the first heating and heat-preserving section, the heating temperature is 650-800 ℃, and the heat-preserving time is 100-240 s; in the second heating and heat-preserving section, the heating temperature is 800-900 ℃, and the heat-preserving time is 60-180 s; in the third heating and heat-preserving section, the heating temperature is 900-975 ℃, and the heat-preserving time is 20-100 s.
In one embodiment, in the method for manufacturing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to the present invention, when the thickness of the steel strip coated with an aluminum-silicon alloy plating layer is less than 1.2 mm, the heating temperature is 630 ℃ and the holding time is 100 s in the first heating and holding section; in the second heating and heat-preserving section, the heating temperature is 790 ℃, and the heat-preserving time is 100 s; in the third heating and heat-preserving section, the heating temperature is 860 ℃, 850 ℃ and 860 ℃ in sequence, and the heat-preserving time is 30 s, 20 s and 30 s in sequence;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is 1.2-1.7 mm, the heating temperature is 740 ℃ and the heat preservation time is 120 s in the first heating and heat preservation section; in the second heating and heat-preserving section, the heating temperature is 830 ℃, and the heat-preserving time is 100 s; in the third heating and heat-preserving section, the heating temperature is 930 ℃ and 940 ℃ in sequence, and the heat-preserving time is 30 s and 30 s in sequence;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is more than 1.7 mm, the heating temperature is 730 ℃ in the first heating and heat-preserving section, and the heat-preserving time is 120 s; in the second heating and heat-preserving section, the heating temperature is 850 ℃, and the heat-preserving time is 80 s; in the third heating and heat-preserving section, the heating temperature is 930 ℃, 920 ℃ and 930 ℃ in sequence, and the heat-preserving time is 20 s, 20 s and 20 s.
In one embodiment, in the method for manufacturing a hot stamped member coated with an al-si alloy plating layer according to the present invention, the smelting and the continuous casting are performed to obtain a steel slab, and the steel slab is processed to obtain a strip steel, including: smelting and continuously casting to obtain a steel plate blank, and sequentially heating, hot rolling, coiling, acid washing and cold rolling the steel plate blank to obtain strip steel;
wherein, by mass percent, the steel slab comprises: 0.12 to 0.40 percent of C, 0.02 to 1.5 percent of Si, 0.02 to 1.5 percent of Al, 0.5 to 3.5 percent of Mn, 0.01 to 0.7 percent of Cr, 0.01 to 0.7 percent of Mo, 0.001 to 0.005 percent of B, less than or equal to 0.005 percent of S, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of N, less than or equal to 0.003 percent of O, and one or more than two of 0.01 to 0.15 percent of Ti, 0.01 to 0.15 percent of Nb and 0.01 to 0.15 percent of V (namely, one or more than two of 0.01 to 0.15 percent of Ti, 0.01 to 0.15 percent of Nb and 0.01 to 0.15 percent of V), and the balance of Fe and inevitable impurities; wherein, the content of (Cr + Mo) is more than or equal to 0.1 percent and less than or equal to 1.0 percent; 0.03 percent to 0.35 percent (Ti + Nb + V);
in a further preferred embodiment, in the method for producing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to the present invention, the steel slab comprises, in mass percent: 0.31% of C, 0.25% of Si, 0.76% of Al, 1.6% of Mn, 0.19% of Cr, 0.13% of Mo, 0.0027% of B, 0.0034% of S, 0.0033% of P, 0.005% of N, 0.003% of O, 0.035% of Ti and 0.13% of V, and the balance of Fe and inevitable impurities.
In one embodiment, in the method for preparing the hot stamping component coated with the aluminum-silicon alloy coating, the heating temperature is 1100-1280 ℃; the final rolling temperature of the hot rolling is 750-950 ℃; the coiling temperature is 500-700 ℃; the total rolling reduction rate of the cold rolling is 40-80%.
In one embodiment, the method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to the present invention, in which the strip steel is coated with the aluminum-silicon alloy plating layer to obtain the strip steel coated with the aluminum-silicon alloy plating layer, includes: annealing the strip steel, immersing the strip steel into an aluminum-silicon alloy plating solution in an aluminum-silicon pot for 2-20 s, and cooling at a cooling rate of 3-50 ℃/s to a temperature of less than or equal to 300 ℃ to obtain the strip steel coated with an aluminum-silicon alloy plating layer; and processing the strip steel coated with the aluminum-silicon alloy plating layer into a blank with the size required by a hot stamping component to obtain a steel plate blank.
Wherein the annealing treatment process comprises the following steps: heating the strip steel to the temperature of 720-850 ℃, preserving the heat for 1-5 min, and then cooling the strip steel to the temperature of 600-700 ℃ at the cooling rate of 5-50 ℃/s;
the temperature of the aluminum-silicon pot is 600-700 ℃;
the aluminum-silicon alloy plating solution comprises the following components in percentage by mass: 8-10% of Si, 0.001-0.1% of Ti, 2-2.6% of Fe, Mn and Cr; wherein, the content of (Mn + Cr) is more than or equal to 0.001% and less than or equal to 0.1%;
in a further preferred embodiment, in the method for producing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to the present invention, the aluminum-silicon alloy plating solution includes, in mass percent: 9 percent of Si, 0.01 percent of Ti, 2 percent of Fe, 0.07 percent of Mn0.01 percent of Cr.
In a further preferred embodiment, in the method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to the present invention, the aluminum-silicon alloy plating layer has a mass per unit area of 10 to 150 g/m2；
In a further preferred embodiment, in the method for producing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to the present invention, the steel strip coated with an aluminum-silicon alloy plating layer includes: a strip steel substrate and the aluminum-silicon alloy plating layer on at least one surface of the strip steel substrate.
In one embodiment, the method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to the present invention includes the steps of treating the aluminum-silicon alloy plating layer-coated steel strip to obtain a steel sheet blank, including: the strip steel coated with the aluminum-silicon alloy coating is sequentially subjected to finishing, straightening and rolling to obtain a steel coil; uncoiling and blanking the steel coil to obtain a steel plate blank;
in a further preferred embodiment, in the method for producing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to the present invention, the hot-stamping quenching process includes: and stamping the steel plate blank in a stamping and quenching die, cooling to 18-31 ℃ at a cooling rate of more than or equal to 20 ℃/s, and cooling for 3-15 s under the condition of pressure maintaining to obtain the hot stamping component coated with the aluminum-silicon alloy coating.
The invention also provides the hot stamping component coated with the aluminum-silicon alloy plating layer, which is prepared by the preparation method of the hot stamping component coated with the aluminum-silicon alloy plating layer;
in a further preferred embodiment, in the aluminum-silicon alloy plating layer-coated hot-stamped component according to the present invention, the aluminum-silicon alloy plating layer-coated hot-stamped component includes, in mass percent: 0.12 to 0.40 percent of C, 0.02 to 1.5 percent of Si, 0.02 to 1.5 percent of Al, 0.5 to 3.5 percent of Mn, 0.01 to 0.7 percent of Cr, 0.01 to 0.7 percent of Mo, 0.001 to 0.005 percent of B, less than or equal to 0.005 percent of S, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of N, less than or equal to 0.003 percent of O, and one or more than two of 0.01 to 0.15 percent of Ti, 0.01 to 0.15 percent of Nb and 0.01 to 0.15 percent of V (namely, one or more than two of 0.01 to 0.15 percent of Ti, 0.01 to 0.15 percent of Nb and 0.01 to 0.15 percent of V), and the balance of Fe and inevitable impurities; wherein, the content of (Cr + Mo) is more than or equal to 0.1 percent and less than or equal to 1.0 percent; 0.03 percent to 0.35 percent (Ti + Nb + V); in the formula in the scheme, symbols such as Cr, Mo, Ti, Nb, V and the like represent percentage content values.
The coating aluminum-silicon alloy plating layer comprises the following components in percentage by mass: 8-10% of Si, 0.001-0.1% of Ti, 2-2.6% of Fe, Mn and Cr; wherein, the content of (Mn + Cr) is more than or equal to 0.001% and less than or equal to 0.1%;
in a further preferred embodiment, in the aluminum-silicon alloy plating layer-coated hot-stamped component according to the present invention, the aluminum-silicon alloy plating layer-coated hot-stamped component includes, in mass percent: 0.31% of C, 0.25% of Si, 0.76% of Al, 1.6% of Mn, 0.19% of Cr, 0.13% of Mo, 0.0027% of B, 0.0034% of S, 0.0033% of P, 0.005% of N, 0.003% of O, 0.035% of Ti and 0.13% of V, and the balance of Fe and inevitable impurities.
In a further preferred embodiment, in the aluminum-silicon alloy plated coated hot stamped component according to the invention, the aluminum-silicon alloy plated coated layer comprises, in mass percent: 9 percent of Si, 0.01 percent of Ti, 2 percent of Fe, 0.07 percent of Mn0.01 percent of Cr.
The hot stamping component coated with the aluminum-silicon alloy plating layer has excellent mechanical properties, wherein the yield strength is 800-1400 MPa, the tensile strength is 1300-2000 MPa, and the elongation is more than or equal to 4%.
The method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to the present application will be described in detail below with reference to examples, comparative examples, and experimental data.
Example 1:
in the embodiment, 10 test groups are adopted, and in the test groups 1 to 10, the hot stamping component coated with the aluminum-silicon alloy plating layer is prepared by adopting the preparation method of the hot stamping component coated with the aluminum-silicon alloy plating layer;
firstly, smelting and continuously casting to obtain a steel plate blank, and sequentially heating, hot rolling, coiling, acid washing and cold rolling the steel plate blank to obtain strip steel;
wherein the steel plate blank comprises the chemical components shown in the table 1 in percentage by mass;
table 1: the steel slab comprises the chemical components
Figure DEST_PATH_IMAGE005
Wherein the heating temperature is 1100-1280 ℃; the final rolling temperature of the hot rolling is 750-950 ℃; the coiling temperature is 500-700 ℃; then carrying out conventional acid washing to remove surface oxide skin; and then carrying out cold rolling, wherein the total rolling reduction rate of the cold rolling is 40-80%. The specific preparation process parameters are shown in table 2:
table 2: the technological parameters of the invention
Figure DEST_PATH_IMAGE006
Secondly, annealing the strip steel obtained in the first step, immersing the strip steel into an aluminum-silicon alloy plating solution in an aluminum-silicon pot for 2-20 s, and cooling the strip steel at a cooling rate of 3-50 ℃/s until the temperature is less than or equal to 300 ℃ to obtain the strip steel coated with an aluminum-silicon alloy plating layer;
wherein the annealing treatment process comprises the following steps: heating the strip steel to the temperature of 720-850 ℃, preserving the heat for 1-5 min, and then cooling the strip steel to the temperature of 600-700 ℃ at the cooling rate of 5-50 ℃/s;
the temperature of the aluminum-silicon pot is 600-700 ℃;
the obtained strip steel coated with the aluminum-silicon alloy coating comprises the following components: a strip steel substrate and the aluminum-silicon alloy plating layer on at least one surface of the strip steel substrate.
Table 3: the aluminum-silicon alloy plating solution comprises the chemical components
Figure DEST_PATH_IMAGE007
Table 4: the annealing and dip plating process parameters of the invention
Figure 571102DEST_PATH_IMAGE008
Thirdly, the strip steel coated with the aluminum-silicon alloy coating layer obtained in the second step is subjected to finishing, straightening and coiling to obtain a steel coil; uncoiling and blanking the steel coil, and processing the steel coil into a required size to obtain a steel plate blank; placing the steel plate blank in a roller hearth type heat treatment furnace for heat treatment, wherein the roller hearth type heat treatment furnace comprises: a first heating and heat-preserving section, a second heating and heat-preserving section and a third heating and heat-preserving section. And stamping the obtained steel plate blank in a stamping and quenching die, cooling to 18-31 ℃ at a cooling rate of more than or equal to 20 ℃/s, and cooling for 3-15 s under the condition of pressure maintaining to obtain the hot stamping component coated with the aluminum-silicon alloy plating layer. The first heating and heat-preserving section adopts an incremental heating mode; the second heating and heat-preserving section adopts an incremental heating mode; and the third heating and heat-preserving section adopts a lifting type heating mode with unfixed temperature. Wherein the third heating and heat-preserving section is a complete austenitizing and heat-preserving section.
Table 5: the heat treatment process parameters of the steel plate blank
Figure DEST_PATH_IMAGE009
In the above test group 1, the roller hearth-type heat treatment furnace had 9 heating furnaces; in test group 2, the roller hearth heat treatment furnace had 8 heating furnaces; in test group 3, the roller hearth heat treatment furnace had 7 heating furnaces; in test group 4, the roller hearth heat treatment furnace had 6 heating furnaces; in test group 5, the roller hearth heat treatment furnace had 5 heating furnaces; as shown in fig. 5; in addition, in test group 6, the roller hearth heat treatment furnace had 9 heating furnaces; in test group 7, the roller hearth heat treatment furnace had 8 heating furnaces; in test group 8, the roller hearth heat treatment furnace had 7 heating furnaces; in test group 9, the roller hearth heat treatment furnace had 6 heating furnaces; in test group 10, the roller hearth heat treatment furnace had 5 heating furnaces
The mechanical properties of the hot stamped member coated with the aluminum-silicon alloy plating layer obtained above were measured, and the results are shown in table 6.
Table 6: results of mechanical Property testing
Figure 19401DEST_PATH_IMAGE010
The data in the above embodiments show that the hot stamping component coated with the aluminum-silicon alloy plating layer has excellent mechanical properties, wherein the yield strength is 800-. The invention reduces the heat preservation time of the steel plate material at the temperature higher than the complete austenitizing temperature by reasonably distributing each heating heat preservation section of the roller-hearth heat treatment furnace, thereby preventing austenite grains from being coarsened excessively and improving the mechanical property of steel.
In addition, the attached figure 2 of the invention shows a range schematic diagram of the heating temperature and the holding time of the first heating and holding section, the second heating and holding section and the third heating and holding section of the heat treatment furnace of the invention (when the thickness of the steel strip coated with the aluminum-silicon alloy plating layer is less than 1.2 mm and when the thickness of the steel strip coated with the aluminum-silicon alloy plating layer is 1.2-1.7 mm); FIG. 3 is a schematic view showing the ranges of the heating temperature and holding time in the first heat-holding section, the second heat-holding section and the third heat-holding section of the heat treatment furnace according to the present invention (when the thickness of the Al-Si alloy coated steel strip is more than 1.7 mm); FIG. 4 is a sectional view of a hot-stamped component coated with an Al-Si alloy plating layer, produced in example 1 of the present invention; fig. 5 is a schematic diagram showing the division of the heating and heat-insulating sections of the roller-hearth heat treatment furnace in the preparation method of embodiment 1 of the present invention (where the temperature zone 1 is the first heating and heat-insulating section of the present invention, the temperature zone 2 is the second heating and heat-insulating section of the present invention, and the temperature zone 3 is the third heating and heat-insulating section of the present invention).
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. A method of producing a hot-stamped component coated with an aluminum-silicon alloy plating layer, the method comprising the steps of: smelting and continuously casting to obtain a steel plate blank, and processing the steel plate blank to obtain strip steel; coating the strip steel with an aluminum-silicon alloy coating to obtain the strip steel coated with the aluminum-silicon alloy coating; treating the strip steel coated with the aluminum-silicon alloy plating layer to obtain a steel plate blank; sequentially carrying out heat treatment and hot stamping quenching treatment on the steel plate blank to obtain the hot stamping component coated with the aluminum-silicon alloy plating layer;
smelting and continuously casting to obtain a steel slab, and processing the steel slab to obtain strip steel, wherein the steel slab comprises the following steps: smelting and continuously casting to obtain a steel plate blank, and sequentially heating, hot rolling, coiling, acid washing and cold rolling the steel plate blank to obtain strip steel;
wherein, by mass percent, the steel slab comprises: 0.12 to 0.40 percent of C, 0.02 to 1.5 percent of Si, 0.02 to 1.5 percent of Al, 0.5 to 3.5 percent of Mn, 0.01 to 0.7 percent of Cr, 0.01 to 0.7 percent of Mo, 0.001 to 0.005 percent of B, less than or equal to 0.005 percent of S, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of N, less than or equal to 0.003 percent of O, 0.01 to 0.15 percent of Ti, 0.01 to 0.15 percent of Nb and 0.01 to 0.15 percent of V, and the balance of Fe and inevitable impurities; wherein, the content of (Cr + Mo) is more than or equal to 0.1 percent and less than or equal to 1.0 percent; 0.03 percent to 0.35 percent (Ti + Nb + V);
the method for coating the aluminum-silicon alloy coating on the strip steel to obtain the strip steel coated with the aluminum-silicon alloy coating comprises the following steps: annealing the strip steel, immersing the strip steel into an aluminum-silicon alloy plating solution in an aluminum-silicon pot for 2-20 s, and cooling at a cooling rate of 3-50 ℃/s to a temperature of less than or equal to 300 ℃ to obtain the strip steel coated with an aluminum-silicon alloy plating layer;
wherein the annealing treatment process comprises the following steps: heating the strip steel to the temperature of 720-850 ℃, preserving the heat for 1-5 min, and then cooling the strip steel to the temperature of 600-700 ℃ at the cooling rate of 5-50 ℃/s;
the temperature of the aluminum-silicon pot is 600-700 ℃;
the aluminum-silicon alloy plating solution comprises the following components in percentage by mass: 8-10% of Si, 0.001-0.1% of Ti, 2-2.6% of Fe, Mn and Cr; wherein, the content of (Mn + Cr) is more than or equal to 0.001% and less than or equal to 0.1%;
wherein the heat treating the steel plate blank comprises: placing the steel plate blank in a heat treatment furnace for heat treatment; the heat treatment furnace includes: the system comprises a first heating and heat-preserving section, a second heating and heat-preserving section and a third heating and heat-preserving section, wherein the first heating and heat-preserving section and the second heating and heat-preserving section adopt incremental heating modes; the third heating and heat-preserving section adopts a lifting type heating mode with unfixed temperature;
wherein, when the thickness of the strip steel coated with the aluminum-silicon alloy coating layer is less than 1.2 mm, the heating temperature and the heat preservation time of the first heating and heat preservation section are limited in a range of an area ABCD, and the area ABCD has the range of the heating temperature and the heat preservation time limited by A (600 ℃, 60 s), B (600 ℃, 120 s), C (750 ℃, 120 s) and D (750 ℃, 60 s); the heating temperature and holding time of the second heating and holding section are defined within a range of a region EFGH having a range of heating temperatures and holding times defined by E (750 ℃, 100 s), F (850 ℃, 100 s), G (850 ℃, 20 s), H (750 ℃, 20 s); the heating temperature and holding time of the third heating and holding section are defined within the range of the region IJKL having the ranges of the heating temperature and holding time defined by I (850 ℃, 100 s), J (975 ℃, 60 s), K (975 ℃, 20 s), L (850 ℃, 40 s);
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is 1.2-1.7 mm, the heating temperature and the heat preservation time of the first heating and heat preservation section are limited within the range of an area abcd, and the range of the heating temperature and the heat preservation time of the area abcd is limited by a (600 ℃, 60 s), b (600 ℃, 220 s), c (750 ℃, 120 s) and d (750 ℃, 60 s); the heating temperature and holding time of the second heating and holding section are defined within a range of a region EFGH having a range of heating temperatures and holding times defined by E (750 ℃, 100 s), F (850 ℃, 100 s), G (850 ℃, 20 s), H (750 ℃, 20 s); the heating temperature and holding time of the third heating and holding section are defined within the range of the region IJKL having the ranges of the heating temperature and holding time defined by I (850 ℃, 100 s), J (975 ℃, 60 s), K (975 ℃, 20 s), L (850 ℃, 40 s);
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is more than 1.7 mm, the heating temperature and the heat preservation time of the first heating and heat preservation section are limited in the range of the area A 'B' C 'D', and the area A 'B' C 'D' has the range of the heating temperature and the heat preservation time limited by A '(650 ℃, 100 s), B' (650 ℃, 240 s), C '(800 ℃, 240 s) and D' (800 ℃, 100 s); the heating temperature and the holding time of the second heating and holding section are defined within a range of a region E 'F' G 'H' having the ranges of the heating temperature and the holding time defined by E '(800 ℃, 180 s), F' (900 ℃, 180 s), G '(900 ℃, 60 s), H' (800 ℃, 60 s); the heating temperature and the holding time of the third heating and holding section are defined within a range of a region I 'J' K 'L' having the ranges of the heating temperature and the holding time defined by I '(900 ℃, 100 s), J' (975 ℃, 60 s), K '(975 ℃, 20 s), L' (900 ℃, 40 s);
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is less than 1.2 mm, in the first heating and heat-preserving section, the heating temperature is 600-750 ℃, and the heat-preserving time is 60-120 s; in the second heating and heat-preserving section, the heating temperature is 750-850 ℃, and the heat-preserving time is 20-100 s; in the third heating and heat-preserving section, the heating temperature is 850-975 ℃, and the heat-preserving time is 20-100 s;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is 1.2-1.7 mm, the heating temperature is 600-750 ℃ in the first heating and heat-preserving section, and the heat-preserving time is 60-220 s; in the second heating and heat-preserving section, the heating temperature is 750-850 ℃, and the heat-preserving time is 20-100 s; in the third heating and heat-preserving section, the heating temperature is 850-975 ℃, and the heat-preserving time is 20-100 s;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is larger than 1.7 mm, in the first heating and heat-preserving section, the heating temperature is 650-800 ℃, and the heat-preserving time is 100-240 s; in the second heating and heat-preserving section, the heating temperature is 800-900 ℃, and the heat-preserving time is 60-180 s; in the third heating and heat-preserving section, the heating temperature is 900-975 ℃, and the heat-preserving time is 20-100 s.
2. The method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to claim 1, wherein the heat treatment furnace is a roller hearth heat treatment furnace.
3. The method for producing an aluminum-silicon alloy plated hot-stamped member according to claim 1 or 2, wherein the heating temperature is 630 ℃ and the keeping time is 100 s in the first heating and keeping section when the thickness of the aluminum-silicon alloy plated steel strip is less than 1.2 mm; in the second heating and heat-preserving section, the heating temperature is 790 ℃, and the heat-preserving time is 100 s; in the third heating and heat-preserving section, the heating temperature is 860 ℃, 850 ℃ and 860 ℃ in sequence, and the heat-preserving time is 30 s, 20 s and 30 s in sequence;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is 1.2-1.7 mm, the heating temperature is 740 ℃ and the heat preservation time is 120 s in the first heating and heat preservation section; in the second heating and heat-preserving section, the heating temperature is 830 ℃, and the heat-preserving time is 100 s; in the third heating and heat-preserving section, the heating temperature is 930 ℃ and 940 ℃ in sequence, and the heat-preserving time is 30 s and 30 s in sequence;
when the thickness of the strip steel coated with the aluminum-silicon alloy coating is more than 1.7 mm, the heating temperature is 730 ℃ in the first heating and heat-preserving section, and the heat-preserving time is 120 s; in the second heating and heat-preserving section, the heating temperature is 850 ℃, and the heat-preserving time is 80 s; in the third heating and heat-preserving section, the heating temperature is 930 ℃, 920 ℃ and 930 ℃ in sequence, and the heat-preserving time is 20 s, 20 s and 20 s.
4. The method for producing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to claim 1 or 2, characterized in that,
the steel plate blank comprises the following components in percentage by mass: 0.31% of C, 0.25% of Si, 0.76% of Al, 1.6% of Mn, 0.19% of Cr, 0.13% of Mo, 0.0027% of B, 0.0034% of S, 0.0033% of P, 0.005% of N, 0.003% of O, 0.035% of Ti and 0.13% of V, and the balance of Fe and inevitable impurities.
5. The method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to claim 1, wherein the heating temperature is 1100 to 1280 ℃; the final rolling temperature of the hot rolling is 750-950 ℃; the coiling temperature is 500-700 ℃; the total rolling reduction rate of the cold rolling is 40-80%.
6. The method for producing a hot-stamped component coated with an aluminum-silicon alloy plating layer according to claim 1 or 2, characterized in that,
the aluminum-silicon alloy plating solution comprises the following components in percentage by mass: 9 percent of Si, 0.01 percent of Ti, 2 percent of Fe, 0.07 percent of Mn0.01 percent of Cr;
the mass per unit area of the aluminum-silicon alloy coating is 10-150 g/m2；
The strip steel coated with the aluminum-silicon alloy coating comprises: a strip steel substrate and the aluminum-silicon alloy plating layer on at least one surface of the strip steel substrate.
7. The method for producing a hot-stamped member coated with an aluminum-silicon alloy plating layer according to claim 1 or 2, wherein the processing of the steel strip coated with an aluminum-silicon alloy plating layer to obtain a steel sheet blank includes: the strip steel coated with the aluminum-silicon alloy coating is sequentially subjected to finishing, straightening and rolling to obtain a steel coil; uncoiling and blanking the steel coil to obtain a steel plate blank;
the hot stamping quenching treatment process comprises the following steps: and stamping the steel plate blank in a stamping and quenching die, cooling to 18-31 ℃ at a cooling rate of more than or equal to 20 ℃/s, and cooling for 3-15 s under the condition of pressure maintaining to obtain the hot stamping component coated with the aluminum-silicon alloy coating.
8. The aluminum-silicon alloy plated coated hot-stamped member produced by the method for producing an aluminum-silicon alloy plated coated hot-stamped member according to any one of claims 1 to 7, wherein;
the hot stamping component coated with the aluminum-silicon alloy plating layer comprises the following components in percentage by mass: 0.12 to 0.40 percent of C, 0.02 to 1.5 percent of Si, 0.02 to 1.5 percent of Al, 0.5 to 3.5 percent of Mn, 0.01 to 0.7 percent of Cr, 0.01 to 0.7 percent of Mo, 0.001 to 0.005 percent of B, less than or equal to 0.005 percent of S, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of N, less than or equal to 0.003 percent of O, 0.01 to 0.15 percent of Ti, 0.01 to 0.15 percent of Nb and 0.01 to 0.15 percent of V, and the balance of Fe and inevitable impurities; wherein, the content of (Cr + Mo) is more than or equal to 0.1 percent and less than or equal to 1.0 percent; 0.03 percent to 0.35 percent (Ti + Nb + V);
the coating aluminum-silicon alloy plating layer comprises the following components in percentage by mass: 8-10% of Si, 0.001-0.1% of Ti, 2-2.6% of Fe, Mn and Cr; wherein, the content of (Mn + Cr) is more than or equal to 0.001% and less than or equal to 0.1%.
9. The aluminum-silicon alloy plated hot-stamped member according to claim 8, wherein;
the hot stamping component coated with the aluminum-silicon alloy plating layer comprises the following components in percentage by mass: 0.31% of C, 0.25% of Si, 0.76% of Al, 1.6% of Mn, 0.19% of Cr, 0.13% of Mo, 0.0027% of B, 0.0034% of S, 0.0033% of P, 0.005% of N, 0.003% of O, 0.035% of Ti and 0.13% of V, and the balance of Fe and inevitable impurities;
the coating aluminum-silicon alloy plating layer comprises the following components in percentage by mass: 9 percent of Si, 0.01 percent of Ti, 2 percent of Fe, 0.07 percent of Mn0.01 percent of Cr.
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