CN114107818B - 1000 MPa-grade hot-galvanized dual-phase steel and production method thereof - Google Patents
1000 MPa-grade hot-galvanized dual-phase steel and production method thereof Download PDFInfo
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Abstract
The invention discloses 1000 MPa-grade hot-galvanized dual-phase steel and a production method thereof, and the formula comprises the following components: C. si, mn, mo, P, S, nb, al and Fe, wherein the production method comprises the steps of smelting in a converter; step two, refining outside the furnace; step three, continuous casting; step four, hot rolling; step five, acid washing; step six, cold rolling; step seven, continuous annealing; step eight, hot galvanizing; the production method adopts a low-C-Si-Mn component system, adds a proper amount of alloy elements to enhance the hardenability of the material, improve the wettability of the surface of the steel strip and the thermal stability of a precipitated phase, and is beneficial to the improvement of the surface quality of the steel strip and the regulation and control of the structure performance.
Description
Technical Field
The invention relates to the technical field of alloy preparation, in particular to 1000 MPa-grade hot-galvanized dual-phase steel and a production method thereof.
Background
The method has the advantages that the energy consumption and carbon emission can be greatly reduced by reducing the weight of a car body in the automobile industry, under the large background of energy conservation and environmental protection, in order to realize the light weight of the car and improve the safety of the car, the utilization of the advanced high-strength steel with the advantages of higher weight reduction potential, collision absorption energy and the like to replace the traditional steel for the car becomes necessary trend, the advanced high-strength steel is widely applied to the manufacture of the car and is the most promising car structural material, wherein the dual-phase steel containing soft-phase ferrite and hard-phase martensite is the most typical advanced high-strength steel, the higher processing hardening rate of the dual-phase steel is crucial to the forming and the stability of a collision area which may appear in the collision process of the car, the manufacturing concept of the modern car provides different requirements on corrosion resistance, excellent ductility, formability and the like for the advanced high-strength steel, the hot-galvanized dual-phase steel has high strength, high plasticity and good corrosion resistance, is one of the most promising steel for the car, the rational application of the dual-phase steel has important significance to realizing the light weight and improving the safety of the car, and the preparation process of the existing hot-galvanized dual-phase steel comprises the following steps:
1. CN201610542806.2, a 1000MPa grade low carbon hot galvanizing dual-phase steel and a preparation method thereof, wherein Cr and Mo are compositely added in chemical components, the cold rolling reduction rate is 40-60%, the steel is cooled in two sections after annealing, the first section is cooled from the annealing temperature to the zinc pool nose temperature 440-460 ℃ at the cooling rate of 10-50 ℃/s, and the second section is cooled to the room temperature at the final cooling rate of 4-10 ℃/s after galvanizing;
2. CN200810119822.6, a 1000MPa grade cold-rolled hot-galvanized dual-phase steel and a manufacturing method thereof, wherein, cr and Mo are added compositely in chemical components, wherein, al:0.005% -0.03%, nb:0.01% -0.03%, ti: 0.01-0.02 percent, cooling in two sections after annealing, wherein the cooling speed CR1 of the first section from the annealing temperature to the zinc bath temperature is 10-20 ℃/s, and the cooling speed CR2 after galvanizing is 8-20 ℃/s to the room temperature;
3. CN201410827950.1, a 1000MPa grade high-aluminum hot-dip galvanized dual-phase steel and a preparation method thereof, wherein Cr and Mo are added in chemical components in a compounding manner, wherein Al: 0.70-0.90 percent, no microalloy elements Nb, V and Ti are added, the finishing rolling temperature is controlled to be 800-850 ℃, and the cooling speed CR1 from the annealing temperature to the slow cooling temperature is 5-10 ℃/s; the cooling speed CR2 from the slow cooling temperature to the zinc bath temperature is 15-22 ℃/s; the temperature of the coating section is 450-470 ℃, the galvanizing time is 6-10s, the cooling speed CR3 after galvanizing is 10-20 ℃/s, and the steel plate is cooled to the room temperature;
4. CN201610169781.6, a 980MPa grade vanadium-containing superfine grain cold-rolled dual-phase steel and a preparation method thereof, the chemical composition design characteristics are that a microalloy element V with relatively high content is added, the steel is slowly cooled from the annealing temperature to the rapid cooling starting temperature of 660-720 ℃, and the slow cooling rate CR1 is 1-5 ℃/s; then quickly cooling to the overaging temperature of 150-350 ℃, the quick cooling rate CR2 is 10-50 ℃/s, and finally cooling to the room temperature;
the manufacturing method described in the above patent involves the addition of a relatively high content of Al and the microalloying element V in addition to the composite addition of Cr, mo, the two-stage cooling described in patents 1, 2 and 4, and the three-stage cooling described in patent 3.
Disclosure of Invention
The invention aims to provide 1000 MPa-grade hot-galvanized dual-phase steel and a production method thereof, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a1000 MPa-grade hot-galvanized dual-phase steel comprises the following components: C. si, mn, mo, P, S, nb, al and Fe, wherein the mass percent of each component is as follows: 0.08 to 0.12 percent of C, 0.25 to 0.55 percent of Si, 2.20 to 2.60 percent of Mn, 0.10 to 0.30 percent of Mo, 0.001 to 0.025 percent of P, 0.001 to 0.015 percent of S, 0.020 to 0.060 percent of Nb, 0.020 to 0.060 percent of Al, and the balance of Fe and inevitable impurities.
Preferably, the components are as follows in percentage by mass: 0.10% of C, 0.38% of Si, 2.42% of Mn, 0.123% of Mo, 0.011% of P, 0.007% of S, 0.040% of Nb, 0.039% of Al, and the balance of Fe and inevitable impurities.
A production method of 1000 MPa-grade hot-galvanized dual-phase steel comprises the steps of smelting in a converter; step two, refining outside the furnace; step three, continuous casting; step four, hot rolling; step five, acid washing; step six, cold rolling; step seven, continuous annealing; step eight, hot galvanizing;
in the first step, smelting in a furnace in an oxidizing atmosphere to obtain primary molten steel;
in the second step, the primary molten steel prepared in the first step is transferred to a refining furnace in a reducing atmosphere for refining to obtain refined molten steel;
in the third step, the refined molten steel prepared in the second step is continuously cast to obtain a steel billet meeting the requirements of the mass percentage content of each component;
in the fourth step, the billet prepared in the third step is placed in a stepping heating furnace to be heated, the temperature is kept at 1220-1280 ℃ for 2-3 hours, alloy elements are basically dissolved, the discharged billet is descaled by high-pressure water with the pressure not lower than 20MPa, the processed billet is conveyed to a roughing mill to be rolled, the initial rolling temperature is 1000-1170 ℃, the intermediate billet after rough rolling is conveyed to a finishing mill group to be rolled for 7 passes, the steel strip after finish rolling is coiled after being cooled, the coiling temperature is 630-670 ℃, and finally the hot rolled steel strip is obtained;
in the fifth step, the hot rolled steel strip prepared in the fourth step is subjected to acid pickling treatment by adopting a high-temperature low-speed acid pickling process;
in the sixth step, the hot rolled steel strip pickled in the fifth step is subjected to cold rolling treatment to obtain a cold rolled steel strip;
in the seventh step, the cold-rolled steel strip prepared in the sixth step is subjected to continuous annealing treatment, and the continuous annealing treatment is carried out in two sections;
and in the eighth step, hot galvanizing treatment is carried out on the steel strip annealed in the seventh step, and the finished hot galvanizing dual-phase steel can be obtained after two sections of cooling are carried out on the galvanized steel strip.
Preferably, in the fourth step, the temperature of the intermediate blank after rough rolling is more than or equal to 960 ℃, the cooling treatment mode is laminar cooling, and the thickness of the hot rolled steel strip is 2.6-3.8mm.
Preferably, in the fifth step, the temperature of the acid solution is 75-85 ℃, and the pickling speed is 80-100m/min.
Preferably, in the sixth step, the cold rolling reduction is 60-80%.
Preferably, in the seventh step, the first section is cooled from the annealing temperature of 800-850 ℃ to the slow cooling temperature of 650-750 ℃, the cooling rate CR1 is 4-15 ℃/s, the second section is cooled from the slow cooling temperature of 650-750 ℃ to the zinc pot temperature of 455-465 ℃, and the cooling rate CR2 is 15-35 ℃/s.
Preferably, in the step eight, the hot galvanizing time is 4-8s, the first section is cooled to 250-270 ℃ from the zinc pot temperature of 455-465 ℃ at the cooling rate of 8-15 ℃/s, and the second section is cooled to 130-150 ℃ at the cooling rate of 4-7 ℃/s.
Compared with the prior art, the invention has the beneficial effects that: the formula of the invention adopts a low C-Si-Mn component system, and a proper amount of alloy elements are added to enhance the hardenability of the material, improve the wettability of the surface of the steel strip and the thermal stability of a precipitated phase, thereby being beneficial to the improvement of the surface quality of the steel strip and the regulation and control of the structure performance.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a graph of a CCT test according to the present invention;
FIG. 3 is a graph of an annealing process of the present invention;
FIG. 4 is a topographical view of a product of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, a technical solution provided by the present invention is:
example 1:
a1000 MPa-grade hot-galvanized dual-phase steel comprises the following components in percentage by weight: C. si, mn, mo, P, S, nb, al and Fe, wherein the mass percent of each component is as follows: 0.10% of C, 0.38% of Si, 2.42% of Mn, 0.123% of Mo, 0.011% of P, 0.007% of S, 0.040% of Nb, 0.039% of Al, and the balance of Fe and inevitable impurities.
A production method of 1000 MPa-grade hot-galvanized dual-phase steel comprises the steps of smelting in a converter; step two, refining outside the furnace; step three, continuous casting; step four, hot rolling; step five, acid washing; step six, cold rolling; step seven, continuous annealing; step eight, hot galvanizing;
in the first step, smelting in a furnace in an oxidizing atmosphere to obtain primary molten steel;
in the second step, the primary molten steel prepared in the first step is transferred to a refining furnace in a reducing atmosphere for refining to obtain refined molten steel;
in the third step, continuously casting the refined molten steel prepared in the second step to obtain a steel billet meeting the requirements of the mass percentage content of each component;
in the fourth step, the billet prepared in the third step is placed in a stepping heating furnace to be heated, the temperature is kept for 2.5 hours at 1240 ℃ so that alloy elements are basically dissolved, the billet after being discharged from the furnace is subjected to high-pressure water descaling treatment, so that the iron scale is better removed and the generation of edge cracks is inhibited, then the treated billet is conveyed to a roughing mill to be rolled, the initial rolling temperature is 1080 ℃, the temperature of the intermediate billet after rough rolling is not less than 960 ℃, the intermediate billet after rough rolling is conveyed to a finishing mill group to be rolled for 7 passes, the finishing rolling temperature is 885 ℃, the intermediate billet after finish rolling is coiled after cooling treatment, the coiling temperature is 650 ℃, and finally the hot rolled steel strip is obtained, wherein the cooling treatment mode is laminar cooling, and the thickness of the hot rolled steel strip is 2.6mm;
in the fifth step, the hot rolled steel strip prepared in the fourth step is subjected to acid pickling by adopting a high-temperature low-speed acid pickling process, wherein the acid liquor temperature is 82 ℃, and the acid pickling speed is 88m/min;
in the sixth step, the hot rolled steel strip pickled in the fifth step is subjected to cold rolling treatment to obtain a cold rolled steel strip, so that the crystal grain crushing degree, the dislocation density and the recrystallization driving force are increased, the cold rolling reduction is 61.5%, and the final specification of the cold rolling is 1.0mm;
in the seventh step, the cold-rolled steel strip prepared in the sixth step is subjected to continuous annealing treatment, the continuous annealing treatment is carried out in two sections, the first section is cooled from the annealing temperature of 830 ℃ to the slow cooling temperature of 710 ℃, the cooling rate CR1 is 15 ℃/s, the cooling rate in the process is fast and short, the volume fraction of austenite required in the annealing process of a two-phase region can be kept unchanged, the second section is cooled from the slow cooling temperature of 710 ℃ to the zinc pot temperature of 460 ℃, the cooling rate CR2 is 29 ℃/s, and the cooling rate in the process is faster so as to avoid bainite phase transformation;
and in the eighth step, hot galvanizing treatment is carried out on the steel strip annealed in the seventh step, the hot galvanizing time is 5s, the galvanized steel strip is cooled in two sections, a finished hot galvanizing dual-phase steel can be obtained, the first section is cooled to 261 ℃ from the temperature of a zinc pot at 460 ℃ at the cooling rate of 11 ℃/s, the transformation from austenite to martensite can be completed in the process, the zinc layer can be completely solidified, the zinc layer is prevented from being bonded on the surface of the roller, the second section is cooled to 145 ℃ at the cooling rate of 7 ℃/s, the process speed is 110m/min, and the coating can be prevented from cracking due to the low cooling rate in the process.
Example 2:
a1000 MPa-grade hot-galvanized dual-phase steel comprises the following components in percentage by weight: C. si, mn, mo, P, S, nb, al and Fe, wherein the mass percent of each component is as follows: 0.11% of C, 0.41% of Si, 2.53% of Mn, 0.185% of Mo, 0.013% of P, 0.009% of S, 0.04% of Nb, 0.041% of Al, and the balance Fe and inevitable impurities.
A production method of 1000 MPa-grade hot-galvanized dual-phase steel comprises the steps of smelting in a converter; step two, refining outside the furnace; step three, continuous casting; step four, hot rolling; step five, acid washing; step six, cold rolling; step seven, continuous annealing; step eight, hot galvanizing;
in the first step, smelting in a furnace in an oxidizing atmosphere to obtain primary molten steel;
in the second step, the primary molten steel prepared in the first step is transferred to a refining furnace in a reducing atmosphere for refining to obtain refined molten steel;
in the third step, the refined molten steel prepared in the second step is continuously cast to obtain a steel billet meeting the requirements of the mass percentage content of each component;
in the fourth step, the billet prepared in the third step is placed in a stepping heating furnace to be heated, the temperature is kept for 2.5 hours at 1270 ℃, alloy elements are basically dissolved, the billet taken out of the furnace is subjected to high-pressure water descaling treatment, so that the scale is better removed and the generation of edge cracks is better inhibited, the treated billet is conveyed to a roughing mill to be rolled, the initial rolling temperature is 1150 ℃, the temperature of the intermediate billet after roughing is not less than 960 ℃, the intermediate billet after roughing is conveyed to a finishing mill group to be rolled for 7 passes, the final rolling temperature is 890 ℃, the intermediate billet after finishing is cooled and coiled, the coiling temperature is 645 ℃, a hot rolled steel strip is finally obtained, the cooling treatment mode is laminar cooling, and the thickness of the hot rolled steel strip is 3.2mm;
in the fifth step, the hot rolled steel strip prepared in the fourth step is subjected to acid pickling by adopting a high-temperature low-speed acid pickling process, wherein the acid liquor temperature is 83 ℃, and the acid pickling speed is 95m/min;
in the sixth step, the hot rolled steel strip pickled in the fifth step is subjected to cold rolling treatment to obtain a cold rolled steel strip, so that the crystal grain crushing degree, the dislocation density and the recrystallization driving force are increased, the cold rolling reduction is 62.5%, and the final specification of the cold rolling is 1.2mm;
in the seventh step, the cold-rolled steel strip prepared in the sixth step is subjected to continuous annealing treatment, the continuous annealing treatment is carried out in two sections, the first section is cooled from the annealing temperature of 820 ℃ to the slow cooling temperature of 680 ℃, the cooling rate CR1 is 12 ℃/s, the cooling rate in the process is fast and short, the volume fraction of austenite required in the annealing process of a two-phase region can be kept unchanged, the second section is cooled from the slow cooling temperature of 680 ℃ to the temperature of a zinc pot of 460 ℃, the cooling rate CR2 is 19 ℃/s, and the cooling rate in the process is faster so as to avoid bainite phase transition;
and in the eighth step, hot galvanizing treatment is carried out on the steel strip annealed in the seventh step, the hot galvanizing time is 5s, the galvanized steel strip is cooled in two sections, a finished hot galvanizing dual-phase steel can be obtained, the first section is cooled to 261 ℃ from the temperature of a zinc pot at 460 ℃ at the cooling rate of 8 ℃/s, the transformation from austenite to martensite can be completed in the process, the zinc layer can be completely solidified, the zinc layer is prevented from being bonded on the surface of the roller, the second section is cooled to 145 ℃ at the cooling rate of 5 ℃/s, the process speed is 80m/min, and the coating can be prevented from cracking due to the low cooling rate in the process.
The properties of the examples are compared in the following table:
based on the above, the invention adopts a low C-Si-Mn component system, adds higher content of Mn for improving hardenability and reducing critical cooling rate, adds element Mo for improving the wettability of the surface of the steel plate and molten zinc liquid, adds a proper amount of microalloy element Nb for improving the volume fraction of a precipitated phase, refines the size of the precipitated phase and improves the thermal stability thereof, is beneficial to regulation and control of structure performance, adopts a high-temperature low-speed pickling process for improving the pickling effect and improving the surface quality of the steel strip, and ensures that the volume fraction of austenite obtained in a two-phase region is kept unchanged and bainite phase transformation is avoided by cooling the steel strip in two sections before galvanization; the galvanized steel strip is cooled in two stages again to complete the martensitic transformation and avoid surface defects, and the annealing process is shown in figure 3, wherein I: heating section, II: heat preservation section, III: slow cooling section, IV: fast cooling section, V: cooling section one after plating VI: and a second cooling section after plating. CR1-CR4 represent the cooling rates of a total of four cooling stages before and after galvanization, respectively.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. A1000 MPa-grade hot-galvanized dual-phase steel and a production method thereof comprise the following components: C. si, mn, mo, P, S, nb, al and Fe, characterized in that: the mass percentage of each component is as follows: 0.08-0.12% of C, 0.25-0.55% of Si, 2.20-2.60% of Mn, 0.10-0.30% of Mo, 0.001-0.025% of P, 0.001-0.015% of S, 0.020-0.060% of Nb, 0.020-0.060% of Al and the balance of Fe and inevitable impurities, wherein the production method comprises the following steps of firstly, smelting in a converter; step two, refining outside the furnace; step three, continuous casting; step four, hot rolling; step five, acid washing; step six, cold rolling; step seven, continuous annealing; step eight, hot galvanizing;
in the first step, smelting in a furnace in an oxidizing atmosphere to obtain primary molten steel;
in the second step, the primary molten steel prepared in the first step is transferred to a refining furnace in a reducing atmosphere for refining to obtain refined molten steel;
in the third step, the refined molten steel prepared in the second step is continuously cast to obtain a steel billet meeting the requirements of the mass percentage content of each component;
in the fourth step, the billet prepared in the third step is placed in a stepping heating furnace to be heated, the temperature is kept for 2-3 hours at 1220-1280 ℃, alloy elements are basically dissolved, the billet discharged from the furnace is descaled by high-pressure water with the pressure of more than or equal to 20MPa, the processed billet is conveyed to a roughing mill to be rolled, the initial rolling temperature is 1000-1170 ℃, the intermediate billet after rough rolling is conveyed to a finishing mill group to be rolled for 7 passes, the steel strip after finish rolling is coiled after being cooled, and the coiling temperature is 630-670 ℃, and finally the hot rolled steel strip is obtained;
in the fifth step, the hot rolled steel strip prepared in the fourth step is subjected to acid pickling treatment by adopting a high-temperature low-speed acid pickling process;
in the sixth step, the hot rolled steel strip pickled in the fifth step is subjected to cold rolling treatment to obtain a cold rolled steel strip;
in the seventh step, the cold-rolled steel strip prepared in the sixth step is subjected to continuous annealing treatment, the first section is cooled from the annealing temperature of 800-850 ℃ to the slow cooling temperature of 650-750 ℃, the cooling rate CR1 is 4-15 ℃/s, the second section is cooled from the slow cooling temperature of 650-750 ℃ to the zinc pot temperature of 455-465 ℃, the cooling rate CR2 is 15-35 ℃/s, and the continuous annealing treatment is carried out in two sections;
and in the eighth step, hot galvanizing treatment is carried out on the steel strip annealed in the seventh step, the hot galvanizing time is 4-8s, the first section is cooled to 250-270 ℃ from the temperature of a zinc pot at 455-465 ℃ at the cooling rate of 8-15 ℃/s, the second section is cooled to 130-150 ℃ at the cooling rate of 4-7 ℃/s, and the galvanized steel strip is cooled in two sections to obtain the finished hot galvanizing dual-phase steel.
2. The 1000MPa grade hot-dip galvanized dual-phase steel according to claim 1, characterized in that: the weight percentage of each component is as follows: 0.10% of C, 0.38% of Si, 2.42% of Mn, 0.123% of Mo, 0.011% of P, 0.007% of S, 0.040% of Nb, 0.039% of Al, and the balance of Fe and inevitable impurities.
3. The production method of 1000MPa grade hot-dip galvanized dual-phase steel according to claim 1, characterized by comprising the following steps: in the fourth step, the temperature of the intermediate blank after rough rolling is more than or equal to 960 ℃, the cooling treatment mode is laminar cooling, and the thickness of the hot rolled steel strip is 2.6-3.8mm.
4. The production method of 1000MPa grade hot dip galvanized dual phase steel according to claim 1, characterized by comprising the following steps: in the fifth step, the temperature of the acid liquor is 75-85 ℃, and the pickling speed is 80-100m/min.
5. The production method of 1000MPa grade hot dip galvanized dual phase steel according to claim 1, characterized by comprising the following steps: in the sixth step, the cold rolling reduction is 60-80%.
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