CN107127238B - Hot stamping forming method for zinc-based plated steel plate or steel strip - Google Patents
Hot stamping forming method for zinc-based plated steel plate or steel strip Download PDFInfo
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- CN107127238B CN107127238B CN201610105905.4A CN201610105905A CN107127238B CN 107127238 B CN107127238 B CN 107127238B CN 201610105905 A CN201610105905 A CN 201610105905A CN 107127238 B CN107127238 B CN 107127238B
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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
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- 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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- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
- C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
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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
- C23C2/06—Zinc or cadmium or alloys based thereon
Abstract
The invention relates to a hot stamping forming method of a zinc-based plated steel plate or steel strip, which is characterized in that the steel plate or the steel strip is conveyed to a vertical heating annealing furnace, the temperature is kept for a certain time to ensure that the steel plate is completely austenitized, a precooling device is applied when the steel plate leaves the annealing furnace, the steel plate is cooled to 650-700 ℃ at a cooling speed of more than 30 ℃/s, blanking is carried out according to the shape and the size of a part, then the steel plate is quickly transferred to a die to carry out hot stamping forming, hardening is carried out in the die at a speed of more than 30 ℃/s, and the hot stamping forming temperature is kept between 400 ℃ and 650 ℃. The method can avoid the substrate cracks caused by local stress and liquid metal brittleness (LME) and is used for solving the problem that the conventional zinc-based hot stamping forming steel cannot avoid the substrate cracks.
Description
Technical Field
The invention relates to the field of metal materials, is mainly suitable for the field of forming thin steel plates of automobile bodies, is a forming method of hot stamping steel plates and steel strips, and is mainly applied to manufacturing structural part such as automobile B columns, automobile door anti-collision beams, bumpers and the like.
Background
The 'light weight' of the automobile can directly reduce the emission and the oil consumption, and is the target of the development of the automobile manufacturing industry at present. The application of high-strength steel and ultrahigh strength becomes one of the mainstream development trends in the field of automobile manufacturing, but because the problems of poor shape, high processing forming load, large rebound quantity and the like easily occur when the ultrahigh-strength steel plate is subjected to cold processing, the use of the ultrahigh-strength steel plate is influenced, and therefore, hot stamping forming is an important way for realizing ultrahigh-strength steel products.
The existing hot stamping forming technology mainly adopts the following process flows: selecting a special hot stamping material → blanking → heating and heat preservation (complete austenitizing of a steel plate) → quickly moving to a die → quenching and cooling while finishing forming, and finally obtaining the ultrahigh-strength stamping part (the structure is martensite, and the strength is about 1500MPa or even higher). The existing hot stamping forming methods mainly comprise two methods, namely direct hot stamping and indirect hot stamping.
In the direct hot stamping method, a steel plate is heated to a temperature higher than an austenitizing temperature and is kept warm for a certain time to achieve complete austenitizing of the steel plate. Thereafter, the heated steel sheet is transferred to a forming die and formed therein in a one-step forming process into a finished component while achieving hardening by means of cooling of the die (the cooling rate of the die is greater than the critical cooling rate of the steel sheet).
In the indirect hot stamping method, the component is first formed to near completion (typically 90% pre-form) in a multi-step forming process. The nearly shaped element is then placed in a furnace and heated to full austenitization and held for a period of time. The heated component is then transferred to a component final size forming die, where special care is taken to take into account the thermal expansion of the pre-formed component. After the specific cooling of the mold is completed, the pre-formed component is cooled in the mold at a cooling rate greater than the critical cooling rate to achieve hardening.
Direct hot stamping methods are easier to implement but only allow the production of parts that are relatively simple in shape. The indirect hot stamping process is more complex, but at the same time more complex shaped parts can be produced.
In addition, conventional hot stamped parts without plating cause decarburization and oxidation peeling of the surface of the stamped steel sheet during heating. In order to prevent oxidation and decarburization of the surface of the hot stamped steel sheet and to provide the hot stamped steel sheet with high temperature resistance and corrosion resistance, a plating technique suitable for hot stamped steel has been developed. At present, the hot stamping coating mainly comprises an aluminum silicon coating (Al-10Si) coating, a hot-dip pure zinc (GI) coating, an alloyed zinc-iron (GA) coating, an electroplated zinc-nickel (Zn-10Ni) coating and the like.
In the direct hot stamping process, the zinc-based plated hot stamping steel capable of providing cathodic corrosion protection can generate microcracks (10um to 100um) in a steel plate matrix under the action of LME (metal matrix electrolyte), and even can extend to the macrocracks in the whole plate thickness direction, so that the application and development of the zinc-based hot stamping plated steel are hindered. The number of cracks of the matrix can be reduced in the subsequent hardening process after forming by using the indirect hot stamping process, but the cracks can not be avoided, and the production cost of the part is increased. Because of this, asian zinc-free based plated steel for hot stamping has so far favored the use of aluminum/silicon plating.
Disclosure of Invention
The invention aims to provide a hot stamping forming method of a zinc-based plated steel plate or steel strip, which is characterized in that after the steel plate or the steel strip is heated, the steel plate or the steel strip is pre-cooled to 700 ℃, blanking is carried out at the temperature, and finally hot stamping forming and in-mold quenching are carried out, wherein the forming temperature range is 400-650 ℃, substrate cracks caused by local stress and LME can be avoided, and the hot stamping forming method is used for solving the problem that the substrate cracks cannot be avoided in the existing hot stamping forming section steel.
In order to achieve the purpose, the scheme of the invention is as follows: a hot stamping method for a zinc-based plated steel sheet or strip, comprising the steps of:
(1) producing a steel plate or steel strip for hot stamping forming, and coating zinc or a zinc-iron alloy on the steel plate or steel strip for hot stamping forming;
(2) heating: putting the steel plate or the steel strip into a heating furnace for continuous annealing, heating the steel plate or the steel strip to a temperature higher than Ac3 at a heating speed of more than 5 ℃/s, and preserving heat for a set time to ensure that the steel plate or the steel strip is austenitized uniformly;
(3) pre-cooling: immediately pre-cooling the steel plate or the steel strip after the steel plate or the steel strip comes out of the heating furnace to 650-700 ℃;
(4) blanking: cutting a steel plate or a steel belt according to the shape and the size of the hot stamping part at the temperature of 650-700 ℃;
(5) hot stamping forming and in-mold quenching: rapidly moving the steel plate or the steel belt after blanking to a hot stamping die for stamping, forming and quenching, wherein the forming temperature ranges from 400 ℃ to 650 ℃; and after the hot stamping forming is finished, cooling the blank in a die, and cooling the blank to room temperature in the die or after the blank is taken out of the die to finish the martensite phase transformation.
According to the hot stamping forming method of the steel plate or the steel strip, in the step (2), the steel plate or the steel strip for hot stamping forming is conveyed to a vertical heating annealing furnace with the temperature not lower than Ac 3.
According to the hot stamping forming method of the steel plate or the steel strip, in the step (5), the hot stamping pressure maintaining time is about 3-15 seconds, and the stamping force is 300-1000 tons.
According to the hot stamping forming method of the steel plate or the steel strip, in the step (2), the heat preservation setting time is 1-3 minutes.
According to the hot stamping forming method of the steel plate or the steel strip, in the step (3), the pre-cooling speed of the steel plate or the steel strip is more than 30 ℃/s.
According to the hot press forming method of the steel plate or the steel strip of the invention, the production process of the steel plate or the steel strip for hot press forming is as follows:
(1) smelting raw materials for producing steel plates or steel strips;
(2) continuous casting to produce a casting blank;
(3) hot rolling: heating a casting blank to 1100-1250 ℃, controlling rolling, wherein the initial rolling temperature is 950-1150 ℃, the final rolling temperature is 750-900 ℃, and the thickness of a hot rolled plate is less than or equal to 20 mm;
(4) coiling at 500-850 ℃ after rolling, and cooling to room temperature to obtain a structure of ferrite and pearlite;
(5) pickling to remove iron scale generated in the hot rolling process;
(6) cold rolling: cold rolling the steel coil to the thickness of below 2.0mm, wherein the cold rolling reduction is more than or equal to 35 percent;
(7) annealing: and annealing the steel coil at 500-800 ℃ for 6-24h, and discharging, thus finishing the production of the steel plate for hot stamping.
According to the hot press forming method of a steel sheet or a steel strip of the present invention, the steel sheet or the steel strip for hot press forming mainly contains C: 0.1% -0.5%, Si: 0.1-0.5%, Mn: 0.5% -3.0%, B:0 to 0.010 percent of Ti, 0 to 0.20 percent of Nb, 0 to 1.0 percent of V, 0 to 1.0 percent of W, 0 to 1.0 percent of Cr, 0 to 1.0 percent of Mo, 0 to 1.0 percent of Cu, 0 to 1.0 percent of Ni, 0 to 0.05 percent of Mg, 0 to 0.05 percent of Ca, 0 to 0.05 percent of REM, 0 to 0.05 percent of Bi, P: < 0.02%, S: < 0.02%, Al: 0.01-0.05%, N: < 0.005%, B: < 0.006%, balance Fe and impurities.
According to the hot stamping forming method of the steel plate or the steel strip, the cold rolling reduction is 50-60%.
The invention achieves the following beneficial effects: the performance of the hot stamping part obtained by the invention is basically equal to that of the traditional hot stamping part, but the invention can greatly reduce the heating temperature of a steel plate, greatly shorten the heat preservation time of the steel plate and greatly save the energy consumption, meanwhile, the heating furnace can be changed into a vertical annealing furnace, the occupied area of the heating furnace can be reduced, in particular to the hot stamping steel with a zinc-based coating, after the hot stamping is formed, the process can avoid the substrate crack caused by the Liquid Metal Embrittlement (LME), and has important significance for the development of the hot stamping steel with the zinc-based coating.
Drawings
FIG. 1 is a flow chart of the hot stamping process of the present invention;
FIG. 2 is a graph of the hot stamping process of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Because the zinc-based hot stamping process in the prior art is easy to cause substrate cracks, in order to overcome the defects in the prior art, the invention provides the hot stamping forming process which can simultaneously improve the hot stamping efficiency and avoid the substrate cracks after the hot stamping forming of the steel for the zinc-based hot stamping. After the hot stamping is carried out by adopting the process, the tensile strength of the steel plate or the steel strip is more than 1500MPa, and the substrate crack caused by local stress and LME is avoided.
The invention firstly provides steel for hot stamping forming, which mainly comprises the following components (all data in percentage by mass): c: 0.1% -0.5%, Si: 0.1-0.5%, Mn: 0.5% -3.0%, B:0 to 0.010 percent of Ti, 0 to 0.20 percent of Nb, 0 to 1.0 percent of V, 0 to 1.0 percent of W, 0 to 1.0 percent of Cr, 0 to 1.0 percent of Mo, 0 to 1.0 percent of Cu, 0 to 1.0 percent of Ni, 0 to 0.05 percent of Mg, 0 to 0.05 percent of Ca, 0 to 0.05 percent of REM, 0 to 0.05 percent of Bi, P: < 0.02%, S: < 0.02%, Al: 0.01-0.05%, N: < 0.005%, B: < 0.006%, the balance being Fe and other unavoidable impurities. The production process of the steel for hot stamping forming is as follows:
(1) smelting the chemical raw materials according to a corresponding proportion by using a converter (or an electric furnace or an induction furnace);
(2) continuous casting to produce a casting blank;
(3) hot rolling: heating a casting blank to 1100-1250 ℃, controlling rolling, wherein the initial rolling temperature is 950-1150 ℃, the final rolling temperature is 750-900 ℃, and the thickness of a hot rolled plate is not more than 20mm, generally 3 mm;
(4) coiling at 500-850 ℃ after rolling, and cooling to room temperature to obtain a structure of ferrite and pearlite;
(5) pickling to remove iron scale generated in the hot rolling process;
(6) cold rolling: and cold-rolling the steel coil to the thickness of less than 2.0mm, wherein the cold-rolling reduction is not less than 35%, and preferably 50-60%.
(7) Annealing: annealing the steel coil at 500-800 ℃ for 6-24h, discharging, and finishing the production of the steel plate for hot stamping,
based on the research of the present invention, it was found that it is necessary to avoid contact of molten zinc with austenite as much as possible in the forming stage, and therefore, it is necessary to perform hot press forming at a temperature lower than the melting point of the zinc layer. In order to ensure that the steel sheet can be quench-hardened even in the above case, the hardenability of the steel sheet or strip can be improved by delaying the transformation of austenite into martensite by adding boron element. As shown in fig. 1 and 2, the hot stamping process of the present invention comprises the following steps:
(1) producing a steel sheet or strip for hot press forming according to the above method, and coating zinc or a zinc-iron alloy on the steel sheet or strip for hot press forming;
(2) heating: putting the steel plate or the steel strip coated with zinc or zinc-iron alloy into a vertical continuous annealing heating furnace with the temperature not lower than Ac3 (austenitizing transformation finishing temperature), heating the steel plate or the steel strip to the temperature higher than Ac3 at the heating speed not lower than 5 ℃/s, and preserving the heat for 1-3 minutes to ensure that the steel plate or the steel strip is austenitized uniformly;
(3) pre-cooling: immediately pre-cooling the steel plate or the steel strip after the steel plate or the steel strip comes out of the heating furnace, wherein the pre-cooling speed is higher than the critical transformation speed of the steel plate, so that the steel plate is prevented from entering a pearlite or bainite transformation region and is cooled to 650-700 ℃;
(4) blanking: cutting a steel plate or a steel belt at the temperature of 650-700 ℃ according to the shape and the size of the hot stamping part;
(5) hot stamping forming and in-mold quenching: and rapidly moving the blanked steel plate or steel belt to a hot stamping die for stamping, forming and quenching, wherein the forming temperature range is 400-650 ℃, the coating can be completely solidified at the temperature, the hot stamping pressure maintaining time is about 3-15 seconds, and the stamping force is 300-1000 tons. After the hot stamping forming is completed, the steel plate or the steel strip is cooled in the die and cooled to room temperature in the die or after being taken out of the die, and the martensite phase transformation is completed.
The method can reduce the hot stamping heating temperature of the traditional steel 22MnB5 for hot stamping from 930 ℃ to about 850 ℃, reduce the heat preservation time from 3-10 minutes to 1-3 minutes, greatly save the energy consumption, and simultaneously change the heating furnace into a vertical annealing furnace, thereby reducing the occupied area of the heating furnace. The hot stamping process can also avoid matrix cracks caused by Liquid Metal brittleness (hereinafter marked as LME) after the hot stamping steel plate of the zinc-based coating is stamped, and has important significance for the development of the steel for the zinc-based hot stamping.
Claims (7)
1. A hot press forming method of a zinc-based plated steel sheet or strip, characterized by comprising: the hot stamping forming method comprises the following steps:
(1) producing a steel plate or strip for hot stamping and coating zinc or a zinc-iron alloy on the steel plate or strip for hot stamping, wherein the production process of the steel plate or strip for hot stamping is as follows:
(a) smelting raw materials for producing steel plates or steel strips;
(b) continuous casting to produce a casting blank;
(c) hot rolling: heating a casting blank to 1100-1250 ℃, controlling rolling, wherein the initial rolling temperature is 950-1150 ℃, the final rolling temperature is 750-900 ℃, and the thickness of a hot rolled plate is less than or equal to 20 mm;
(d) coiling at 500-850 ℃ after rolling, and cooling to room temperature to obtain a structure of ferrite and pearlite;
(e) pickling to remove iron scale generated in the hot rolling process;
(f) cold rolling: cold rolling the steel coil to the thickness of below 2.0mm, wherein the cold rolling reduction is more than or equal to 35 percent;
(g) annealing: annealing the steel coil at 500-800 ℃ for 6-24h, and discharging to finish the production of the steel plate or steel band for hot stamping forming;
(2) heating: putting the steel plate or the steel strip into a heating furnace for continuous annealing, heating the steel plate or the steel strip to a temperature higher than Ac3 at a heating speed of more than 5 ℃/s, and preserving heat for a set time to ensure that the steel plate or the steel strip is austenitized uniformly;
(3) pre-cooling: immediately pre-cooling the steel plate or the steel strip after the steel plate or the steel strip comes out of the heating furnace to 650-700 ℃;
(4) blanking: cutting a steel plate or a steel belt according to the shape and the size of the hot stamping part at the temperature of 650-700 ℃;
(5) hot stamping forming and in-mold quenching: rapidly moving the steel plate or the steel belt after blanking to a hot stamping die for stamping, forming and quenching, wherein the forming temperature ranges from 400 ℃ to 650 ℃; and after the hot stamping forming is finished, cooling the blank in a die, and cooling to room temperature in the die or after the blank is taken out of the die to finish the martensite phase transformation.
2. The method according to claim 1, wherein the steel sheet or strip for hot stamping is conveyed to a vertical annealing furnace having a temperature of Ac3 or more in the step (2).
3. The method according to claim 1, wherein the hot stamping dwell time in step (5) is 3 to 15 seconds, and the stamping force is 300 to 1000 tons.
4. The method for hot press forming a zinc-based plated steel sheet or strip according to claim 1, wherein the heat retention time in the step (2) is 1 to 3 minutes.
5. The method for hot press forming a zinc-based plated steel sheet or strip according to claim 1, wherein the pre-cooling rate of the steel sheet or strip in the step (3) is more than 30 ℃/s.
6. The method of hot press forming a zinc-based plated steel sheet or strip according to claim 1, wherein the steel sheet or strip raw material for hot press forming comprises: c: 0.1% -0.5%, Si: 0.1-0.5%, Mn: 0.5% -3.0%, B:0 to 0.010 percent of Ti, 0 to 0.20 percent of Nb, 0 to 1.0 percent of V, 0 to 1.0 percent of W, 0 to 1.0 percent of Cr, 0 to 1.0 percent of Mo, 0 to 1.0 percent of Cu, 0 to 1.0 percent of Ni, 0 to 0.05 percent of Mg, 0 to 0.05 percent of Ca, 0 to 0.05 percent of REM, 0 to 0.05 percent of Bi, P: < 0.02%, S: < 0.02%, Al: 0.01-0.05%, N: < 0.005%, the balance being Fe and impurities.
7. The method for hot-press forming a zinc-based plated steel sheet or strip according to claim 1, wherein the cold rolling reduction is 50 to 60%.
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| CN201610105905.4A CN107127238B (en) | 2016-02-26 | 2016-02-26 | Hot stamping forming method for zinc-based plated steel plate or steel strip |
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| CN201610105905.4A CN107127238B (en) | 2016-02-26 | 2016-02-26 | Hot stamping forming method for zinc-based plated steel plate or steel strip |
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| CN107127238B true CN107127238B (en) | 2019-12-27 |
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