EP3770295A1 - Manufacturing method for hot stamping component having aluminium-silicon alloy coating, and hot stamping component - Google Patents
Manufacturing method for hot stamping component having aluminium-silicon alloy coating, and hot stamping component Download PDFInfo
- Publication number
- EP3770295A1 EP3770295A1 EP19847997.4A EP19847997A EP3770295A1 EP 3770295 A1 EP3770295 A1 EP 3770295A1 EP 19847997 A EP19847997 A EP 19847997A EP 3770295 A1 EP3770295 A1 EP 3770295A1
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- EP
- European Patent Office
- Prior art keywords
- heating
- aluminum
- silicon alloy
- alloy coating
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000011248 coating agent Substances 0.000 title claims abstract description 126
- 238000000576 coating method Methods 0.000 title claims abstract description 126
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 title abstract 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 179
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000000758 substrate Substances 0.000 claims abstract description 26
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 86
- 229910000676 Si alloy Inorganic materials 0.000 claims description 81
- 238000009792 diffusion process Methods 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 10
- 230000024121 nodulation Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 30
- 238000007747 plating Methods 0.000 description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005275 alloying Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
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- 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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- 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
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- 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
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
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- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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- 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
- C21D11/00—Process control or regulation for heat treatments
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
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- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
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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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C22C38/18—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
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- 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
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- 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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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- 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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- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
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- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
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- 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
Definitions
- the present invention relates to manufacturing technology of hot stamping components, in particular to a manufacturing method of a hot stamping component having an aluminum-silicon alloy coating and a hot stamping component.
- Chinese patent CN101583486B discloses a method of coated stamping products, including the temperature and time of stamping, wherein the heating rate from room temperature to 700 °C is 4-12 °C/s, which aims at ensuring the spot welding performance of stamping components.
- Chinese patent CN102300707B further discloses a heating method of coated hot stamping components, specifically discloses the heating rate under melting temperature, the holding time under austenitizing temperature, etc.
- this heating method still could not solve the problem of adhesion to the roller and nodulation by aluminum-silicon coating, which causes problems such as the decrease in service life of heat treatment furnace roller and peeling of coating of hot stamping components.
- the purpose of the present invention is to provide a manufacturing method of a hot stamping component having an aluminum-silicon alloy coating and a hot stamping component, which can not only effectively solve the problem of adhesion to the roller by aluminum-silicon coating, reduce the nodulation probability of the heat treatment furnace roller and improve the service life of the roller, but can also ensure the integrity of the coating of the hot stamping component and the mechanical properties, welding performance, coating performance and corrosion resistance of the component.
- a manufacturing method of a hot stamping component having an aluminum-silicon alloy coating comprising the following steps: machining a steel plate coated with an aluminum-silicon alloy coating into a blank having a shape required for a part; conducting heat treatment and hot stamping of the blank; wherein, in the heat treatment of the blank, the blank is put into a heat treatment furnace for austenitizing heat treatment, and the heat treatment process of the blank comprises a first heating and holding stage, a second heating and holding stage, and a third heating and holding stage; and wherein:
- the heating and holding time of the second heating and holding stage is zero so that the heat treatment process of the blank comprises two-stages of heating and temperature-holding, consisting of the first heating and holding stage and the third heating and holding stage; compared with the aforementioned three-stage heating and holding, the two-stage heating and holding has the following characteristics: the heating and holding time in the furnace is shortened and the production efficiency is improved, but as the heating temperature is higher, the energy consumption is increased and the requirement for equipment heating capacity is higher; and wherein:
- the temperature increases stepwise in the order of the first, second, and third heating and holding stages or the temperatures in the first, second, and third heating and holding stages are set to be certain temperatures.
- the heat treatment process can be as follows: the temperature and time of the first heating and holding stage are 800 °C and 60 s, respectively; and the temperature and time of the second heating and holding stage are 930 °C and 120 s, respectively; and the temperature and time of the third heating and holding stage are 940 °C and 60 s, respectively.
- the heat treatment process can also be as follows: multiple temperatures, for example 770 °C for 40 s, 820 °C for 30 s and 770 °C for 50 s are set in the first heating and holding stage; and multiple temperatures, for example 900 °C for 60 s and 930 °C for 60 s are set in the second heating and holding stage; and multiple temperatures, for example 935 °C for 60 s and 940 °C for 60 s are set in the third heating and holding stage.
- the time of the heat treatment process of the blank is not less than 150 s and not more than 600 s. Within this time range, the blank after heat treatment has high surface quality, good coating performance, and good welding performance.
- a heat treatment furnace is used in the heat treatment process of the blank.
- the oxygen content in the furnace's atmosphere is not less than 15% and the dew point in the furnace is not higher than -5 °C.
- the final hot stamping component has a low hydrogen content and an excellent resistance to delayed cracking.
- the heat-treated blank is quickly transferred to a mold for stamping, the transfer time is 4-12 seconds, and the blank is in a temperature of not lower than 600 °C before being fed into the mold; the mold is cooled before stamping to ensure that the surface temperature of the mold before stamping is lower than 100 °C, and the cooling rate of the blank is greater than 30 °C/s.
- the microstructure of the hot stamping component obtained through the above process is mainly martensite or bainite, and the hot stamping component has excellent mechanical properties and meets the requirements for use.
- the steel plate coated with an aluminum-silicon alloy coating comprises a substrate and an aluminum-silicon alloy coating on at least one surface of the substrate, and the substrate comprises the following composition in percentage by weight: C: 0.04-0.8%, Si ⁇ 1.2%, Mn: 0.1-5%, P ⁇ 0.3%, S ⁇ 0.1%, Al ⁇ 0.3%, Ti ⁇ 0.5%, B ⁇ 0.1%, Cr ⁇ 3% and the rest being Fe and inevitable impurities.
- the aluminum-silicon alloy coating comprises the following composition in percentage by weight: Si: 4-14%, Fe: 0-4%, and the balance being Al and inevitable impurities.
- the average weight of the aluminum-silicon alloy coating is 58-105 g/m 2 on one side; more preferably, the average weight of the aluminum-silicon alloy coating is 72-88 g/m 2 on one side.
- the final hot stamping component has a uniform appearance and color (no color difference), good coating performance, and good welding performance.
- the aluminum-silicon alloy coating of the hot stamping component obtained by the manufacturing method of the present invention comprises a surface alloy layer and a diffusion layer, and the ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.08-0.5.
- the final hot stamping component has uniform appearance and color, good coating performance and good welding performance.
- the aluminum-silicon alloy coating comprises two layers, the one that is in contact with the substrate is a diffusion layer.
- Al in the aluminum-silicon alloy coating and Fe of the substrate further diffuse to form the diffusion layer.
- Al in the aluminum-silicon alloy coating and Fe of the substrate are alloyed to form a surface alloy layer.
- the ratio of the thickness of the diffusion layer to the total thickness of the aluminum-silicon alloy coating is 0.08-0.5.
- the hot stamping component according to the present invention has a yield strength of 400-1300 MPa, a tensile strength of 500-2000 MPa, and an elongation of 4% or more.
- the elongation of the hot stamping component according to the present invention is 4 to 20%.
- the hot stamping component For the hot stamping component according to the present invention, no coating peels off, the surface roughness meets the requirements, and the ratio of the thickness of the diffusion layer to the thickness of the coating is between 0.08 and 0.5. After electrophoretic coating, the coating film is complete and the coating film adhesion is evaluated as grade 0 or higher.
- the thickness of the diffusion layer and the thickness of the coating meet the requirements, the ratio of the thickness of the diffusion layer to the thickness of the coating is between 0.08 and 0.5, and the spot welding performance is excellent with all the spot welding range being 2KA or above.
- the coating on the hot stamping component according to the present invention can well meet the diffusion of the coating and the austenitization of the substrate, and the melting and adhesion to the roller of the coating can be avoided, thereby obtaining the hot stamping component with good coating performance and substrate performance.
- the melting point of Al-Si alloy of the aluminum-silicon alloy coating is between 580 and 600 °C
- the austenitizing temperature of the steel plate is 840 °C or above
- the aluminum-silicon alloy coating will melt during the heat treatment process, and adhere to the furnace roller.
- Al in the coating and Fe of the substrate will diffuse to form an Fe-Al alloy which has a strong heat resistance and a high melting temperature, and will not cause adhesion to the furnace roller.
- the melting of the aluminum-silicon alloy coating, the adhesion of the coating to the heat treatment furnace roller and the nodulation of the furnace roller are avoided as much as possible.
- the production cycle time by ensuring the coating to reach an appropriate alloying degree, obtaining a suitable thickness of the coating and of the diffusion layer, and the surface quality of the coating, the welding performance and coating performance of the component are guaranteed.
- the beneficial effects of the present invention are as follows: By designing the heat treatment process of the blank, the adhesion of the aluminum-silicon alloy coating to the heat treatment furnace roller is reduced, the occurrence rate of nodulation of the heat treatment furnace roller is reduced, and the maintenance cycle and service life of the roller are extended.
- the heat treatment process of the blank according to the present invention can improve the surface quality of the stamping component and prevent the coating from peeling off during the heat treatment process.
- the heat treatment process of the blank according to present invention adopts a stepwise heating mode, fully considers the characteristics of the aluminum-silicon alloy coating, and appropriately adjusts the temperature and time according to the thickness of the blank, so that the energy can be effectively used and a good energy saving effect is achieved.
- Table 1 shows the compositions of the substrates of the steel plates in Examples of the present invention
- Table 2 shows the manufacturing processes and properties of the hot stamping components in Examples of the present invention.
- a substrate with a thickness of 1.2 mm was subjected to hot dip aluminum plating at 650 °C, the composition of the plating bath is 8% of Si and 2.3% of Fe, with the rest being Al and inevitable impurities.
- the steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape.
- the blank was subjected to a heat treatment, and the specific parameters of the heat treatment are shown in Table 2.
- the appearance of the obtained hot stamping component is shown in Figure 2 .
- the cross-sectional microstructure of the aluminum-silicon alloy coating is shown in Figure 3 .
- the aluminum-silicon alloy coating comprises a surface alloy layer and a diffusion layer, and the ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.25.
- a substrate with a thickness of 0.9 mm was subjected to hot dip aluminum plating at 660 °C, the composition of the plating bath is 9% of Si and 2.5% of Fe, with the rest being Al and inevitable impurities.
- the steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment, and the specific parameters of the heat treatment are shown in Table 2. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.3.
- a substrate with a thickness of 1.0 mm was subjected to hot dip aluminum plating at 660 °C, the composition of the plating bath is 8.5% of Si and 2.5% of Fe, with the rest being Al and inevitable impurities.
- the steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.15.
- a substrate with a thickness of 1.1 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 9.5% of Si and 2.5% of Fe, with the rest being Al and inevitable impurities.
- the steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.28.
- a substrate with a thickness of 1.2 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 8.8% of Si and 2.4% of Fe, with the rest being Al and inevitable impurities.
- the steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.35.
- a substrate with a thickness of 1.5 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 8.8% of Si and 2.4% of Fe, with the rest being Al and inevitable impurities.
- the steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.35.
- a substrate with a thickness of 1.6 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 8.8% of Si and 2.4% of Fe, with the rest being Al and inevitable impurities.
- the steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment.
- the ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.3.
- a substrate with a thickness of 1.8 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 8.8% of Si and 2.4% of Fe, with the rest being Al and inevitable impurities.
- the steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.35.
- a substrate with a thickness of 2.0 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 8.8% of Si and 2.4% of Fe, with the rest being Al and inevitable impurities.
- the steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.4.
- Table 1 Composition of the substrate of the steel in percentage by weight (wt %) Examples C Si Mn P S Al Ti B Cr 1 0.22 0.10 2.90 0.059 0.038 0.09 0.090 0.031 0.150 2 0.10 0.02 0.8 0.018 0.007 0.08 0.001 0.001 0.003 3 0.20 0.23 1.19 0.015 0.040 0.08 0.027 0.005 0.200 4 0.39 0.36 3.00 0.044 0.030 0.07 0.050 0.006 0.300 5 0.08 0.05 0.70 0.02 0.010 0.05 0.002 0.220 6 0.25 0.40 2.30 0.059 0.038 0.09 0.090 0.031 0.150 7 0.12 0.20 0.90 0.018 0.007 0.08 0.001 0.001 0.003 8 0.30 0.30 1.70 0.015 0.040 0.08 0.027 0.005 0.200 9 0.50 0.36 3.00 0.044 0.030 0.07 0.050 0.006 0.300 Comparative Example 0.22 0.10 2.90 0.059 0.038 0.09
- Figure 1 shows the surface of the hot stamping component in Comparative Example.
- the aluminum-silicon coating surface melts, which causes the coating to adhere to the roller.
- Figure 2 shows the surface of the hot stamping component in Example 1 of the present invention.
- the aluminum-silicon alloy coating surface shows no sign of melting, and the alloying is sufficient.
- Figure 3 is a cross-sectional view of the coating of the hot stamping component in Example 1 of the present invention. It can be seen from the Figure that the aluminum-silicon alloy coating comprises two layers, i.e. a surface alloy layer and a diffusion layer. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is about 0.25.
- the substrate mainly consists of martensite.
- Figure 4 shows the ranges of the first, the second and the third heating and holding stages when the thickness of the steel plate coated with an aluminum-silicon alloy coating according to the present invention is less than 1.5 mm.
- the temperature and time of heating and holding in the first heating and holding stage lie within a graph ABCD
- the temperature and time of heating and holding in the second heating and holding stage lie within a graph EFGH
- the temperature and time of heating and holding in the third heating and holding stage lie within a graph IJKL.
- Figure 5 shows the ranges of the first, the second and the third heating and holding stages when the thickness of the steel plate coated with an aluminum-silicon alloy coating according to the present invention is 1.5 mm or more.
- the temperature and time of heating and holding in the first heating and holding stage lie within a graph A'B'C'D'
- the temperature and time of heating and holding in the second heating and holding stage lie within a graph E'F'G'H'
- the temperature and time of heating and holding in the third heating and holding stage lie within a graph I'J'K'L'.
- Figure 6 is a schematic diagram of the temperature and time ranges of heating and holding in the first and the third heating and holding stages of the heat treatment process (two-stage heating and holding) of the blank according to the present invention, the heating and holding time in the second heating and holding stage is zero, which forms a two-stage heating and holding.
- the temperature and time of heating and holding in the first heating and holding stage lie within a graph abcd
- the temperature and time of heating and holding in the third heating and holding stage lie within a graph ijkl.
- the temperature and time of heating and holding in the first heating and holding section lie within a graph a'b'c'd'
- the temperature and time of heating and holding in the third heating and holding stage lie within a graph i'j'k'l'.
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Abstract
Description
- The present invention relates to manufacturing technology of hot stamping components, in particular to a manufacturing method of a hot stamping component having an aluminum-silicon alloy coating and a hot stamping component.
- Lightweight and emission reduction are the main development trends of the automotive industry. High strength of automotive parts is finally achieved by heat treatment for changing the microstructure of the materials when using relatively low-strength materials. This hot forming technique realizes the improvement of forming level of automotive parts and guarantees the high strength properties. Compared with uncoated hot stamping products, the one that has an aluminum-silicon coating has a good thickness and dimensional accuracy, good corrosion resistance and welding performance. The proportion of hot stamping steels with an aluminum-silicon coating accounts for 70% of the hot stamping steels currently in use, and it will get higher and higher for the foreseeable future.
- Chinese patent
CN101583486B discloses a method of coated stamping products, including the temperature and time of stamping, wherein the heating rate from room temperature to 700 °C is 4-12 °C/s, which aims at ensuring the spot welding performance of stamping components. - Chinese patent
CN102300707B further discloses a heating method of coated hot stamping components, specifically discloses the heating rate under melting temperature, the holding time under austenitizing temperature, etc. However, considering the efficiency and production cycle time of the heat treatment furnace during use, users find that this heating method still could not solve the problem of adhesion to the roller and nodulation by aluminum-silicon coating, which causes problems such as the decrease in service life of heat treatment furnace roller and peeling of coating of hot stamping components. - The purpose of the present invention is to provide a manufacturing method of a hot stamping component having an aluminum-silicon alloy coating and a hot stamping component, which can not only effectively solve the problem of adhesion to the roller by aluminum-silicon coating, reduce the nodulation probability of the heat treatment furnace roller and improve the service life of the roller, but can also ensure the integrity of the coating of the hot stamping component and the mechanical properties, welding performance, coating performance and corrosion resistance of the component.
- To achieve the above purpose, the technical solutions of the present invention are as follows.
- A manufacturing method of a hot stamping component having an aluminum-silicon alloy coating, comprising the following steps: machining a steel plate coated with an aluminum-silicon alloy coating into a blank having a shape required for a part; conducting heat treatment and hot stamping of the blank; wherein, in the heat treatment of the blank, the blank is put into a heat treatment furnace for austenitizing heat treatment, and the heat treatment process of the blank comprises a first heating and holding stage, a second heating and holding stage, and a third heating and holding stage;
and wherein: - when the thickness of the steel plate coated with an aluminum-silicon alloy coating is less than 1.5 mm,
- in the first heating and holding stage, the temperature and time of heating and holding lie within a graph ABCD, the graph ABCD represents the ranges of temperature and time defined by coordinates of A (750 °C, 30 s), B (750 °C, 90 s), C (870 °C, 90 s) and D (870 °C, 30 s); and
- in the second heating and holding stage, the temperature and time of heating and holding lie within a graph EFGH, the graph EFGH represents the ranges of temperature and time defined by coordinates of E (875 °C, 60 s), F (875 °C, 240 s), G (930 °C, 150 s) and H (930 °C, 30 s); and
- in the third heating and holding stage, the temperature and time of heating and holding lie within a graph IJKL, the graph IJKL represents the ranges of temperature and time defined by coordinates of I (935 °C, 60 s), J (935 °C, 240 s), K (955 °C, 180 s) and L (955 °C, 30 s);
- when the thickness of steel plate coated with an aluminum-silicon alloy coating is 1.5 mm or more,
- in the first heating and holding stage, the temperature and time of heating and holding lie within a graph A'B'C'D', the graph A'B'C'D' represents the ranges of temperature and time defined by coordinates of A' (750 °C, 30 s), B' (750 °C, 90 s), C' (890 °C, 90 s) and D' (890 °C, 30 s); and
- in the second heating and holding stage, the temperature and time of heating and holding lie within a graph E'F'G'H', the graph E'F'G'H' represents the ranges of temperature and time defined by coordinates of E' (895 °C, 90 s), F' (895 °C, 270 s), G' (940 °C, 210 s) and H' (940 °C, 60 s); and
- in the third heating and holding stage, the temperature and time of heating and holding lie within a graph I'J'K'L', the graph I'J'K'L' represents the ranges of temperature and time defined by coordinates of I' (945 °C, 60 s), J' (945 °C, 240 s), K' (955 °C, 180 s) and L' (955 °C, 30 s).
- Further, the heating and holding time of the second heating and holding stage is zero so that the heat treatment process of the blank comprises two-stages of heating and temperature-holding, consisting of the first heating and holding stage and the third heating and holding stage; compared with the aforementioned three-stage heating and holding, the two-stage heating and holding has the following characteristics: the heating and holding time in the furnace is shortened and the production efficiency is improved, but as the heating temperature is higher, the energy consumption is increased and the requirement for equipment heating capacity is higher;
and wherein: - when the thickness of the steel plate coated with an aluminum-silicon alloy coating is less than 1.5 mm,
- in the first heating and holding stage, the temperature and time of heating and holding lie within a graph abcd, the graph abcd represents the ranges of temperature and time defined by coordinates of a (750 °C, 30 s), b (750 °C, 90 s), c (870 °C, 90 s) and d (870 °C, 30 s); and
- in the third heating and holding stage, the temperature and time of heating and holding lie within a graph ijkl, the graph ijkl represents the ranges of temperature and time defined by coordinates of i (935 °C, 180 s), j (935 °C, 300 s), k (955 °C, 270 s) and 1 (955 °C, 150 s);
- when the thickness of steel plate coated with an aluminum-silicon alloy coating is 1.5 mm or more,
- in the first heating and holding stage, the temperature and time of heating and holding lie within a graph a'b'c'd', the graph a'b'c'd' represents the ranges of temperature and time defined by coordinates of a' (750 °C, 30 s), b' (750 °C, 90 s), c' (890 °C, 90 s) and d' (890 °C, 30 s); and
- in the third heating and holding stage, the temperature and time of heating and holding lie within a graph i'j'k'l', the graph i'j'k'l' represents the ranges of temperature and time defined by coordinates of i' (945 °C, 180 s), j' (945 °C, 300 s), k' (955 °C, 270 s) and 1' (955 °C, 150 s).
- Furthermore, in the heat treatment process of the blank, the temperature increases stepwise in the order of the first, second, and third heating and holding stages or the temperatures in the first, second, and third heating and holding stages are set to be certain temperatures.
- For example, for the steel plate having a thickness of 1.2 mm and an aluminum-silicon alloy coating, the heat treatment process can be as follows: the temperature and time of the first heating and holding stage are 800 °C and 60 s, respectively; and the temperature and time of the second heating and holding stage are 930 °C and 120 s, respectively; and the temperature and time of the third heating and holding stage are 940 °C and 60 s, respectively. The heat treatment process can also be as follows: multiple temperatures, for example 770 °C for 40 s, 820 °C for 30 s and 770 °C for 50 s are set in the first heating and holding stage; and multiple temperatures, for example 900 °C for 60 s and 930 °C for 60 s are set in the second heating and holding stage; and multiple temperatures, for example 935 °C for 60 s and 940 °C for 60 s are set in the third heating and holding stage.
- Preferably, the time of the heat treatment process of the blank is not less than 150 s and not more than 600 s. Within this time range, the blank after heat treatment has high surface quality, good coating performance, and good welding performance.
- Preferably, a heat treatment furnace is used in the heat treatment process of the blank. The oxygen content in the furnace's atmosphere is not less than 15% and the dew point in the furnace is not higher than -5 °C. The final hot stamping component has a low hydrogen content and an excellent resistance to delayed cracking.
- Preferably, in the hot stamping process, the heat-treated blank is quickly transferred to a mold for stamping, the transfer time is 4-12 seconds, and the blank is in a temperature of not lower than 600 °C before being fed into the mold; the mold is cooled before stamping to ensure that the surface temperature of the mold before stamping is lower than 100 °C, and the cooling rate of the blank is greater than 30 °C/s. The microstructure of the hot stamping component obtained through the above process is mainly martensite or bainite, and the hot stamping component has excellent mechanical properties and meets the requirements for use.
- Additionally, the steel plate coated with an aluminum-silicon alloy coating comprises a substrate and an aluminum-silicon alloy coating on at least one surface of the substrate, and the substrate comprises the following composition in percentage by weight: C: 0.04-0.8%, Si<1.2%, Mn: 0.1-5%, P<0.3%, S<0.1%, Al<0.3%, Ti<0.5%, B<0.1%, Cr<3% and the rest being Fe and inevitable impurities.
- Preferably, the aluminum-silicon alloy coating comprises the following composition in percentage by weight: Si: 4-14%, Fe: 0-4%, and the balance being Al and inevitable impurities. By adopting the above-mentioned silicon alloy coating composition, the obtained alloy coating has a uniform and thin thickness, the coating has good adhesion and good machinability.
- Preferably, the average weight of the aluminum-silicon alloy coating is 58-105 g/m2 on one side; more preferably, the average weight of the aluminum-silicon alloy coating is 72-88 g/m2 on one side. By controlling the average weight of the aluminum-silicon alloy coating within the range, the final hot stamping component has a uniform appearance and color (no color difference), good coating performance, and good welding performance.
- In addition, the aluminum-silicon alloy coating of the hot stamping component obtained by the manufacturing method of the present invention comprises a surface alloy layer and a diffusion layer, and the ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.08-0.5. The final hot stamping component has uniform appearance and color, good coating performance and good welding performance.
- Specifically, the aluminum-silicon alloy coating comprises two layers, the one that is in contact with the substrate is a diffusion layer. During the heat treatment process, Al in the aluminum-silicon alloy coating and Fe of the substrate further diffuse to form the diffusion layer. Al in the aluminum-silicon alloy coating and Fe of the substrate are alloyed to form a surface alloy layer. In the component after hot stamping, the ratio of the thickness of the diffusion layer to the total thickness of the aluminum-silicon alloy coating (including the diffusion layer and the surface alloy layer) is 0.08-0.5.
- The hot stamping component according to the present invention has a yield strength of 400-1300 MPa, a tensile strength of 500-2000 MPa, and an elongation of 4% or more.
- Preferably, the elongation of the hot stamping component according to the present invention is 4 to 20%.
- During the heat treatment process of the hot stamping component according to the present invention, no coating melts and adheres to the roller, the coating is complete and has a good adhesion, and there is no significant peeling off the surface.
- For the hot stamping component according to the present invention, no coating peels off, the surface roughness meets the requirements, and the ratio of the thickness of the diffusion layer to the thickness of the coating is between 0.08 and 0.5. After electrophoretic coating, the coating film is complete and the coating film adhesion is evaluated as
grade 0 or higher. - For the hot stamping component according to the present invention, the thickness of the diffusion layer and the thickness of the coating meet the requirements, the ratio of the thickness of the diffusion layer to the thickness of the coating is between 0.08 and 0.5, and the spot welding performance is excellent with all the spot welding range being 2KA or above.
- During the heat treatment process, the coating on the hot stamping component according to the present invention can well meet the diffusion of the coating and the austenitization of the substrate, and the melting and adhesion to the roller of the coating can be avoided, thereby obtaining the hot stamping component with good coating performance and substrate performance.
- Specifically, the melting point of Al-Si alloy of the aluminum-silicon alloy coating is between 580 and 600 °C, the austenitizing temperature of the steel plate is 840 °C or above, the aluminum-silicon alloy coating will melt during the heat treatment process, and adhere to the furnace roller. Meanwhile, Al in the coating and Fe of the substrate will diffuse to form an Fe-Al alloy which has a strong heat resistance and a high melting temperature, and will not cause adhesion to the furnace roller. In the present invention, by controlling dwell time of the aluminum-silicon coating in the heating process and in the heating and holding stages, the melting of the aluminum-silicon alloy coating, the adhesion of the coating to the heat treatment furnace roller and the nodulation of the furnace roller are avoided as much as possible. And according to the production cycle time, by ensuring the coating to reach an appropriate alloying degree, obtaining a suitable thickness of the coating and of the diffusion layer, and the surface quality of the coating, the welding performance and coating performance of the component are guaranteed.
- The beneficial effects of the present invention are as follows:
By designing the heat treatment process of the blank, the adhesion of the aluminum-silicon alloy coating to the heat treatment furnace roller is reduced, the occurrence rate of nodulation of the heat treatment furnace roller is reduced, and the maintenance cycle and service life of the roller are extended. - Moreover, the heat treatment process of the blank according to the present invention can improve the surface quality of the stamping component and prevent the coating from peeling off during the heat treatment process.
- In addition, the heat treatment process of the blank according to present invention adopts a stepwise heating mode, fully considers the characteristics of the aluminum-silicon alloy coating, and appropriately adjusts the temperature and time according to the thickness of the blank, so that the energy can be effectively used and a good energy saving effect is achieved.
-
-
Figure 1 shows a surface of the hot stamping component with an aluminum-silicon alloy coating prepared in Comparative Example 1. -
Figure 2 shows a surface of the hot stamping component with an aluminum-silicon alloy coating prepared in Example 1 of the present invention. -
Figure 3 is a cross-sectional view of the hot stamping component with an aluminum-silicon alloy coating prepared in Example 1 of the present invention. -
Figure 4 is a schematic diagram of the temperature and time ranges of heating and temperature in the first to the third heating and holding stages of the heat treatment process (three-stage heating and holding) of the blank according to the present invention (in the case of the steel plate thickness < 1.5 mm). -
Figure 5 is a schematic diagram of the temperature and time ranges of heating and holding in the first to the third heating and holding stages of the heat treatment process (three-stage heating and holding) of the blank according to the present invention (in the case of the steel plate thickness ≥ 1.5mm). -
Figure 6 is a schematic diagram of the temperature and time ranges of heating and holding in the first and the third heating and holding stages of the heat treatment process (two-stage heating and holding) of the blank according to the present invention. - The present invention is further described below with reference to Examples and Figures.
- Table 1 shows the compositions of the substrates of the steel plates in Examples of the present invention; Table 2 shows the manufacturing processes and properties of the hot stamping components in Examples of the present invention.
- A substrate with a thickness of 1.2 mm was subjected to hot dip aluminum plating at 650 °C, the composition of the plating bath is 8% of Si and 2.3% of Fe, with the rest being Al and inevitable impurities. The steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment, and the specific parameters of the heat treatment are shown in Table 2. The appearance of the obtained hot stamping component is shown in
Figure 2 . The cross-sectional microstructure of the aluminum-silicon alloy coating is shown inFigure 3 . The aluminum-silicon alloy coating comprises a surface alloy layer and a diffusion layer, and the ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.25. - A substrate with a thickness of 0.9 mm was subjected to hot dip aluminum plating at 660 °C, the composition of the plating bath is 9% of Si and 2.5% of Fe, with the rest being Al and inevitable impurities. The steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment, and the specific parameters of the heat treatment are shown in Table 2. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.3.
- A substrate with a thickness of 1.0 mm was subjected to hot dip aluminum plating at 660 °C, the composition of the plating bath is 8.5% of Si and 2.5% of Fe, with the rest being Al and inevitable impurities. The steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.15.
- A substrate with a thickness of 1.1 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 9.5% of Si and 2.5% of Fe, with the rest being Al and inevitable impurities. The steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.28.
- A substrate with a thickness of 1.2 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 8.8% of Si and 2.4% of Fe, with the rest being Al and inevitable impurities. The steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.35.
- A substrate with a thickness of 1.5 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 8.8% of Si and 2.4% of Fe, with the rest being Al and inevitable impurities. The steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.35.
- A substrate with a thickness of 1.6 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 8.8% of Si and 2.4% of Fe, with the rest being Al and inevitable impurities. The steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.3.
- A substrate with a thickness of 1.8 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 8.8% of Si and 2.4% of Fe, with the rest being Al and inevitable impurities. The steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.35.
- A substrate with a thickness of 2.0 mm was subjected to hot dip aluminum plating at 680 °C, the composition of the plating bath is 8.8% of Si and 2.4% of Fe, with the rest being Al and inevitable impurities. The steel plate coated with the aluminum-silicon alloy coating was continuously blanked into a blank with a certain shape. The blank was subjected to a heat treatment. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.4.
Table 1 Composition of the substrate of the steel in percentage by weight (wt %) Examples C Si Mn P S Al Ti B Cr 1 0.22 0.10 2.90 0.059 0.038 0.09 0.090 0.031 0.150 2 0.10 0.02 0.8 0.018 0.007 0.08 0.001 0.001 0.003 3 0.20 0.23 1.19 0.015 0.040 0.08 0.027 0.005 0.200 4 0.39 0.36 3.00 0.044 0.030 0.07 0.050 0.006 0.300 5 0.08 0.05 0.70 0.02 0.010 0.05 0.002 0.002 0.220 6 0.25 0.40 2.30 0.059 0.038 0.09 0.090 0.031 0.150 7 0.12 0.20 0.90 0.018 0.007 0.08 0.001 0.001 0.003 8 0.30 0.30 1.70 0.015 0.040 0.08 0.027 0.005 0.200 9 0.50 0.36 3.00 0.044 0.030 0.07 0.050 0.006 0.300 Comparative Example 0.22 0.10 2.90 0.059 0.038 0.09 0.090 0.031 0.150 Table 2 Examples thickness of the steel plate with coating (mm) the first heating and holding stage the second heating and holding stage the third heating and holding stage the ratio of thickness of alloy layer to thickness of the surface layer temperature (°C) time of heating and holding (s) temperature (°C) time of heating and holding (s) temperature (°C) time of heating and holding (s) 1 1.2 750 85 880 100 935 100 0.25 2 0.9 770 90 890 60 935 60 0.30 3 1.0 790 60 900 130 940 180 0.15 4 1.1 800 70 - - 950 250 0.28 5 1.2 850 55 920 150 950 100 0.35 6 1.5 760 90 900 100 945 100 0.35 7 1.6 790 80 910 170 945 150 0.30 8 1.8 830 70 - - 950 230 0.35 9 2.0 880 60 930 200 950 80 0.40 Comparative Example 1.2 - - - - 945 150 0.05 -
Figure 1 shows the surface of the hot stamping component in Comparative Example. The aluminum-silicon coating surface melts, which causes the coating to adhere to the roller. -
Figure 2 shows the surface of the hot stamping component in Example 1 of the present invention. The aluminum-silicon alloy coating surface shows no sign of melting, and the alloying is sufficient. -
Figure 3 is a cross-sectional view of the coating of the hot stamping component in Example 1 of the present invention. It can be seen from the Figure that the aluminum-silicon alloy coating comprises two layers, i.e. a surface alloy layer and a diffusion layer. The ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is about 0.25. The substrate mainly consists of martensite. -
Figure 4 shows the ranges of the first, the second and the third heating and holding stages when the thickness of the steel plate coated with an aluminum-silicon alloy coating according to the present invention is less than 1.5 mm. The temperature and time of heating and holding in the first heating and holding stage lie within a graph ABCD, the temperature and time of heating and holding in the second heating and holding stage lie within a graph EFGH, and the temperature and time of heating and holding in the third heating and holding stage lie within a graph IJKL. -
Figure 5 shows the ranges of the first, the second and the third heating and holding stages when the thickness of the steel plate coated with an aluminum-silicon alloy coating according to the present invention is 1.5 mm or more. The temperature and time of heating and holding in the first heating and holding stage lie within a graph A'B'C'D', the temperature and time of heating and holding in the second heating and holding stage lie within a graph E'F'G'H', and the temperature and time of heating and holding in the third heating and holding stage lie within a graph I'J'K'L'. -
Figure 6 is a schematic diagram of the temperature and time ranges of heating and holding in the first and the third heating and holding stages of the heat treatment process (two-stage heating and holding) of the blank according to the present invention, the heating and holding time in the second heating and holding stage is zero, which forms a two-stage heating and holding. - When the thickness of the steel plate coated with an aluminum-silicon alloy coating is less than 1.5 mm, the temperature and time of heating and holding in the first heating and holding stage lie within a graph abcd, and the temperature and time of heating and holding in the third heating and holding stage lie within a graph ijkl.
- When the thickness of the steel plate coated with an aluminum-silicon alloy coating is 1.5 mm or more, the temperature and time of heating and holding in the first heating and holding section lie within a graph a'b'c'd', and the temperature and time of heating and holding in the third heating and holding stage lie within a graph i'j'k'l'.
Claims (12)
- A manufacturing method of a hot stamping component having an aluminum-silicon alloy coating, comprising the following steps: machining a steel plate coated with an aluminum-silicon alloy coating into a blank having a shape required for a part; conducting heat treatment and hot stamping of the blank;
wherein, in the heat treatment of the blank, the blank is put into a heat treatment furnace for austenitizing heat treatment, and the heat treatment process of the blank comprises a first heating and holding stage, a second heating and holding stage, and a third heating and holding stage;
and wherein:when the thickness of the steel plate coated with an aluminum-silicon alloy coating is less than 1.5 mm,in the first heating and holding stage, the temperature and time of heating and holding lie within a graph ABCD, the graph ABCD represents the ranges of temperature and time defined by coordinates of A (750 °C, 30 s), B (750 °C, 90 s), C (870 °C, 90 s) and D (870 °C, 30 s); andin the second heating and holding stage, the temperature and time of heating and holding lie within a graph EFGH, the graph EFGH represents the ranges of temperature and time defined by coordinates of E (875 °C, 60 s), F (875 °C, 240 s), G (930 °C, 150 s) and H (930 °C, 30 s); andin the third heating and holding stage, the temperature and time of heating and holding lie within a graph IJKL, the graph IJKL represents the ranges of temperature and time defined by coordinates of I (935 °C, 60 s), J (935 °C, 240 s), K (955 °C, 180 s) and L (955 °C, 30 s);when the thickness of the steel plate coated with an aluminum-silicon alloy coating is 1.5 mm or more,in the first heating and holding stage, the temperature and time of heating and holding lie within a graph A'B'C'D', the graph A'B'C'D' represents the ranges of temperature and time defined by coordinates of A' (750 °C, 30 s), B' (750 °C, 90 s), C' (890 °C, 90 s) and D' (890 °C, 30 s); andin the second heating and holding stage, the temperature and time of heating and holding lie within a graph E'F'G'H', the graph E'F'G'H' represents the ranges of temperature and time defined by coordinates of E' (895 °C, 90 s), F' (895 °C, 270 s), G' (940 °C, 210 s) and H' (940 °C, 60 s); andin the third heating and holding stage, the temperature and time of heating and holding lie within a graph I'J'K'L', the graph I'J'K'L' represents the ranges of temperature and time defined by coordinates of I' (945 °C, 60 s), J' (945 °C, 240 s), K' (955 °C, 180 s) and L' (955 °C, 30 s). - The manufacturing method of a hot stamping component having an aluminum-silicon alloy coating as claimed in claim 1, wherein the heating and holding time of the second heating and holding stage is zero so that the heat treatment process of the blank comprises two-stages of heating and temperature-holding, consisting of the first heating and holding stage and the third heating and holding stage,
and wherein,
when the thickness of the steel plate coated with an aluminum-silicon alloy coating is less than 1.5 mm,
in the first heating and holding stage, the temperature and time of heating and holding lie within a graph abcd, the graph abcd represents the ranges of temperature and time defined by coordinates of a (750 °C, 30 s), b (750 °C, 90 s), c (870 °C, 90 s) and d (870 °C, 30 s); and
in the third heating and holding stage, the temperature and time of heating and holding lie within a graph ijkl, the graph ijkl represents the ranges of temperature and time defined by coordinates of i (935 °C, 180 s), j (935 °C, 300 s), k (955 °C, 270 s) and 1 (955 °C, 150 s);
when the thickness of the steel plate coated with an aluminum-silicon alloy coating is 1.5 mm or more,
in the first heating and holding stage, the temperature and time of heating and holding lie within a graph a'b'c'd', the graph a'b'c'd' represents the ranges of temperature and time defined by coordinates of a' (750 °C, 30 s), b' (750 °C, 90 s), c' (890 °C, 90 s) and d' (890 °C, 30 s); and
in the third heating and holding stage, the temperature and time of heating and holding lie within a graph i'j'k'l', the graph i'j'k'l' represents the ranges of temperature and time defined by coordinates of i' (945 °C, 180 s), j' (945 °C, 300 s), k' (955 °C, 270 s) and l' (955 °C, 150 s). - The manufacturing method of a hot stamping component having an aluminum-silicon alloy coating as claimed in claim 1, wherein in the heat treatment process of the blank, the temperature increases stepwise in the order of the first, second, and third heating and holding stages or the temperatures in the first, second, and third heating and holding stages are set to be certain temperatures.
- The manufacturing method of a hot stamping component having an aluminum-silicon alloy coating as claimed in claim 1, wherein the time of the heat treatment process of the blank is not less than 150 s and not more than 600 s.
- The manufacturing method of a hot stamping component having an aluminum-silicon alloy coating as claimed in claim 1, wherein a heat treatment furnace is used in the heat treatment process of the blank, the oxygen content in the furnace's atmosphere is not less than 15%, and the dew point in the furnace is not higher than -5 °C.
- The manufacturing method of a hot stamping component having an aluminum-silicon alloy coating as claimed in claim 1, wherein in the hot stamping process, the heat-treated blank is quickly transferred to a mold for stamping, the transfer time is 4-12 seconds, and the blank is in a temperature of not lower than 600 °C before being fed into the mold; the mold is cooled before stamping to ensure that the surface temperature of the mold before stamping is lower than 100 °C, and the cooling rate of the blank is greater than 30 °C/s.
- The manufacturing method of a hot stamping component having an aluminum-silicon alloy coating as claimed in claim 1, wherein the steel plate coated with an aluminum-silicon alloy coating comprises a substrate and an aluminum-silicon alloy coating on at least one surface of the substrate, and the substrate comprises the following composition in percentage by weight: C: 0.04-0.8%, Si<1.2%, Mn: 0.1-5%, P<0.3%, S<0.1%, Al<0.3%, Ti<0.5%, B<0.1%, Cr<3%, and the rest being Fe and inevitable impurities.
- The manufacturing method of a hot stamping component having an aluminum-silicon alloy coating as claimed in claim 7, wherein the aluminum-silicon alloy coating comprises the following composition in percentage by weight: Si: 4-14%, Fe: 0-4%, and the balance being Al and inevitable impurities.
- The manufacturing method of a hot stamping component having an aluminum-silicon alloy coating as claimed in claim 7 or 8, wherein the average weight of the aluminum-silicon alloy coating is 58-105 g/m2 on one side.
- The manufacturing method of a hot stamping component having an aluminum-silicon alloy coating as claimed in claim 7 or 8, wherein the average weight of the aluminum-silicon alloy coating is 72-88 g/m2 on one side.
- A hot stamping component obtained by the manufacturing method of a hot stamping component having an aluminum-silicon alloy coating as claimed in any one of claims 1 to 10, wherein the aluminum-silicon alloy coating of the hot stamping component comprises a surface alloy layer and a diffusion layer, and the ratio of the thickness of the diffusion layer to the thickness of the aluminum-silicon alloy coating is 0.08-0.5.
- The hot stamping component obtained by the manufacturing method of a hot stamping component having an aluminum-silicon alloy coating as claimed in claim 11, wherein the hot stamping component has a yield strength of 400-1300 MPa, a tensile strength of 500-2000 MPa, and an elongation of 4% or more.
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CN201811035118.2A CN109518114A (en) | 2018-08-08 | 2018-09-06 | The manufacturing method and hot stamping part of hot stamping part with alusil alloy coating |
PCT/CN2019/104708 WO2020030200A1 (en) | 2018-08-08 | 2019-09-06 | Manufacturing method for hot stamping component having aluminium-silicon alloy coating, and hot stamping component |
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WO2021104462A1 (en) | 2019-11-29 | 2021-06-03 | 宝山钢铁股份有限公司 | High-performance thermoformed component provided with coating, and manufacturing method therefor |
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KR102240850B1 (en) * | 2020-07-10 | 2021-04-16 | 주식회사 포스코 | Manufacturing method of hot fress formed part having excellent productivity, weldability and formability |
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