Steel plate having zinc-based coating layer and excellent corrosion resistance, hot-stamped component, and production method therefor

Abstract

Disclosed is a steel plate having a zinc-based coating layer, wherein the zinc-based coating layer has a zinc mass percentage content of ≥50％, an Al + Mg mass percentage content of <50%, and a thickness of 3-15 microns. Correspondingly, further disclosed is a hot-stamped component prepared from the steel plate having the zinc-based coating layer, a coating layer of the hot-stamped component comprising a surface layer and a ZnFe alloy layer; wherein the surface layer has a mass percentage content of zinc oxide of 5-50%, and a content of manganese oxide of less than 5%; and wherein the ZnFe alloy layer comprises a first ZnFe alloy phase having a mass percentage content of Fe not exceeding 25%, and a second ZnFe alloy phase having a mass percentage content of Fe of 50-70%, with the mass percentage content of Fe in the coating layer of the hot-stamped component gradually increasing from the surface to a steel substrate. Further disclosed are a method for manufacturing the steel plate having the zinc-based coating layer and a method for manufacturing the hot-stamped component. A hot-stamped component prepared using the method has excellent corrosion resistance.

Description

Zinc-based coated steel sheet with excellent corrosion resistance, hot stamping component and manufacturing method thereof Technical Field

[0001] The present invention relates to a steel plate, a hot stamping component and a manufacturing method thereof, and in particular to a coated steel plate, a hot stamping component and a manufacturing method thereof. Background Art

[0002] Hot stamping parts have a wide range of applicability due to their excellent mechanical properties and good formability.

[0003] The production of hot stamping parts requires heating the steel plate to above the austenitizing temperature. Traditional steel plates cannot meet the requirements due to problems such as surface oxidation, decarburization, shot peening, and poor dimensional accuracy.

[0004] Therefore, one current solution is to use aluminum-silicon coated steel plates. Aluminum-silicon coating can be suitable for hot stamping steel due to its excellent high temperature resistance and oxidation resistance. However, on the other hand, the overlap between aluminum-silicon coated hot stamping parts and adjacent materials is often difficult to completely cover during the electrophoretic coating process of the entire vehicle. Vehicle durability tests have found that aluminum-silicon hot stamping parts often corrode first at the edges and cuts.

[0005] Another option is to use galvanized steel sheets for hot stamping parts. This is because zinc, due to its chemical properties, provides excellent protection against cut-out corrosion. However, due to zinc's low melting point, the hot stamping process is prone to zinc volatilization or melting, and LME cracks can form all the way to the substrate, significantly limiting the use of zinc-based hot stamping steel.

[0006] To address this issue, a Chinese patent document, CN107922988A, published on April 17, 2018, and titled “Method for non-contact cooling of steel plates and apparatus therefor,” discloses a hot stamping method and apparatus with a pre-cooling process. Active cooling is performed after heating for hot stamping and before forming, in a delayed transformation manner, thereby causing the steel plate to undergo forming transformation hardening at 450-700°C.

[0007] In addition, a Chinese patent document with publication number CN109070396A and publication date December 21, 2018, entitled “Method and apparatus for producing hardened steel parts,” discloses that a fluid is introduced during the stamping process to quickly convert zinc into a stable compound, thereby preventing secondary microcracks.

[0008] It can be seen that the above methods all adopt indirect hot stamping methods rather than direct hot stamping methods, which will affect production efficiency to a certain extent and require special production equipment.

[0009] Based on this, it is desired to provide a solution that can efficiently produce hot stamping parts with excellent corrosion resistance using a direct hot stamping method.

[0010] Summary of the Invention

[0011] One of the objects of the present invention is to provide a zinc-based coated steel sheet that can be effectively used to prepare zinc-based hot stamping parts, which can obtain hot stamping parts with excellent corrosion resistance and improve the production efficiency of hot stamping parts.

[0012] In order to achieve the above-mentioned objectives, the present invention proposes a zinc-based coated steel sheet, which includes a steel substrate and a zinc-based coating coated on the surface of the steel substrate, wherein the mass percentage of Zn in the zinc-based coating is ≥50%, the mass percentage of Al+Mg is <50%, and the thickness of the zinc-based coating is 3-15 microns.

[0013] In the present invention, the zinc-based coating composition may include, in addition to Zn, one or more of Al, Mg, and Si. Therefore, the zinc-based coating composition of the present invention may be a binary or multi-element alloy containing Zn, including but not limited to Zn-Al, Zn-Al-Mg, and Zn-Al-Mg-Si.

[0014] Furthermore, in the zinc-based coated steel sheet of the present invention, the zinc-based coating further contains Si, preferably, the mass percentage of Si is ≤10%, preferably ≤5%.

[0015] In some embodiments, the mass percentage of Zn in the zinc-based coating is 50-99.9%.

[0016] In some embodiments, the mass percentage of Al+Mg is ≤45%. In some embodiments, the mass percentage of Al+Mg is 0.1-45%. In some embodiments, the mass percentage of Al+Mg is 1-45%.

[0017] Furthermore, in the zinc-based coated steel sheet of the present invention, the thickness of the zinc-based coating is 3-10 microns or 5-10 microns.

[0018] Furthermore, in the zinc-coated steel sheet of the present invention, the steel substrate can be any steel known in the art for producing zinc-based hot-stamped parts. An exemplary steel substrate has the following chemical element mass percentages: C: 0.05-0.5%, Si: 0.01-2.0%, Mn: 0.3-3.0%, Al: 0.005-0.3%, Ti≤0.1%, B≤0.1%, Cr≤0.5%, Nb≤0.1%, V≤0.1%, Ni≤0.5%, Mo≤0.5%, with the balance being Fe and unavoidable impurities.

[0019] Furthermore, in the zinc-based coated steel sheet of the present invention, among the inevitable impurities of the steel substrate, P≤0.3% and S≤0.1%.

[0020] It should be noted that, in other embodiments, steel substrates with other component content ratios are also feasible.

[0021] In some embodiments, the steel substrate has a thickness of 1.0-2.5 mm.

[0022] Another object of the present invention is to provide a hot stamping component having excellent corrosion resistance, good strength, and high production efficiency.

[0023] Based on the above invention objectives, the present invention also provides a hot stamping component, the hot stamping component comprising a steel substrate and a coating coated on the surface of the steel substrate, the coating comprising a surface layer and a ZnFe alloy layer; wherein the mass percentage of zinc oxide in the surface layer is 5-50%, and the manganese oxide content is less than 5%; wherein the ZnFe alloy layer comprises a first ZnFe alloy phase having an Fe mass percentage of no more than 25%, and a second ZnFe alloy phase having an Fe mass percentage of 50-70%, and the Fe mass percentage in the coating of the hot stamping component gradually increases from the surface to the steel substrate. Preferably, the steel substrate is as described in any embodiment herein. Preferably, the coating is the zinc-based coating described in any embodiment herein.

[0024] In some embodiments, in the surface layer, the mass percentage of aluminum oxide is 1-50%, and the mass percentage of magnesium oxide is 0.5-10%.

[0025] In some embodiments, the area of ​​the first ZnFe alloy phase occupies 5-50% of the coating area, and the area of ​​the second ZnFe alloy phase occupies 40-90% of the coating area.

[0026] One of the core improvements of this invention is that the surface layer of the hot-stamped component's coating has a zinc oxide content of 5-50% and a manganese oxide content of less than 5%, resulting in excellent weldability, paintability, and corrosion resistance. Furthermore, the alloy layer includes a first ZnFe alloy phase with an Fe content of no more than 25%, which provides excellent corrosion resistance. A second ZnFe alloy phase with an Fe content of 50-70% suppresses the initiation and propagation of cracks in the coating.

[0027] Furthermore, the microstructure of the hot stamping part of the present invention comprises at least one of martensite, bainite, and ferrite. In some embodiments, the microstructure of the hot stamping part comprises martensite or bainite, and optionally pearlite or ferrite.

[0028] In some embodiments, the content of manganese oxide in the hot stamping component of the present invention is 0-4.8%.

[0029] In some embodiments, the mass percentage of Fe in the first ZnFe alloy phase of the hot stamping component according to the present invention is 10-25%, such as 15-25%.

[0030] Preferably, the hot stamping component is obtained by directly hot stamping the zinc-coated steel sheet as described in any embodiment of the present invention. Preferably, the hot stamping component is obtained by using the manufacturing method of the hot stamping component as described in any embodiment of the present invention.

[0031] The specific microstructure is related to the composition ratio of the steel substrate and the cooling rate during the hot stamping step.

[0032] Another object of the present invention is to provide a method for manufacturing a zinc-based coated steel sheet, which comprises the steps of: steelmaking, hot rolling, cold rolling, annealing and hot-dip galvanizing, and flattening; wherein in the hot rolling step, the coiling temperature is controlled to be 500-700°C; wherein in the annealing and hot-dip galvanizing steps, the annealing temperature is controlled to be 700-810°C, the plating solution temperature is 400-600°C, and the cooling rate of the steel sheet after leaving the zinc pot is 5-30°C / s.

[0033] In some embodiments, the plating solution comprises, based on the total weight of the plating solution, 0.0001-50% Al, 0.0001-10% Mg, and 0-5% Si, wherein the mass ratio of Al to Mg, Al / Mg, is in the range of 1-10000, and the remainder is Zn and unavoidable impurities.

[0034] It should be noted that the hot rolling coiling temperature can be adjusted according to the plate thickness within the range of 500-700℃. If the plate thickness is large, the coiling temperature can be appropriately lowered within this range. If the plate thickness is small, the coiling temperature can be appropriately increased within this range. One purpose is to improve the coil shape of the hot rolled coil. The second purpose is to improve the internal and external oxidation characteristics of the hot rolled plate surface, and thereby affect the change in Fe content in the ZnFe alloy phase in the alloy layer of the component after hot stamping. The third purpose is to control the dimensional accuracy of the steel plate and prevent thickness fluctuations.

[0035] After the hot-rolled plate is pickled to remove the surface oxide scale, it is cold-rolled to obtain the required thickness specifications. The cold-rolling deformation is controlled at 10-70%. If the deformation is less than 10%, the cold-rolled steel plate will have uneven structure, affecting the toughness and stability of the hot-stamped parts. If the deformation is higher than 70%, the difficulty of cold rolling increases.

[0036] Furthermore, in the method for manufacturing the zinc-based coated steel sheet of the present invention, in the cold rolling step, the cold rolling deformation is controlled to be 10-70%.

[0037] Another object of the present invention is to provide a method for manufacturing a hot stamping component, comprising the steps of:

[0038] Producing the zinc-based coated steel sheet;

[0039] The zinc-based coated steel sheet is heated in the first stage, wherein the first stage heating temperature is 350-750° C. and the first stage heating time is 10-600 s;

[0040] The zinc-based coated steel sheet is subjected to a second-stage heating, wherein the second-stage heating temperature is 760-950° C., and the second-stage heating time is adjusted according to the thickness of the zinc-based coated steel sheet;

[0041] The zinc-coated steel sheet is transferred to a die for simultaneous cooling and stamping.

[0042] The core improvement of the present invention is that, through the above steps, a special coating structure of the hot stamping component can be achieved, that is, the mass percentage of zinc oxide in the surface layer is 5-50%, the manganese oxide content is less than 5%, the aluminum oxide content is 1-50%, and the magnesium oxide content is 0.5-10%; wherein the ZnFe alloy layer includes a first ZnFe alloy phase with an Fe mass percentage of not more than 25%, and a second ZnFe alloy phase with an Fe mass percentage of 50-70%, the area of ​​the first ZnFe alloy phase accounts for 5-50% of the coating area, and the area of ​​the second ZnFe alloy phase accounts for 40-90% of the coating area, and the mass percentage of Fe in the coating of the hot stamping component gradually increases from the surface to the steel substrate, thereby achieving excellent corrosion resistance, especially notch corrosion protection.

[0043] In addition, the above hot stamping method can ensure the optimal ZnFe alloying change of the coating, ensuring that the ZnFe alloy phase with an Fe content of 7-25% in the alloy layer is preferentially formed on the surface, and the ZnFe alloy phase with an Fe content of 50-70% is present close to the steel substrate. The two-layer setting can also effectively prevent the expansion of surface cracks of the component.

[0044] In addition, the heating process adopted by the heating setting of the present invention can also control the generation rate and surface content of zinc oxide and manganese oxide on the surface, thereby ensuring the corrosion resistance and welding and painting properties of the components.

[0045] Furthermore, the heating temperature in the first stage can be a constant temperature within the range of 350-750°C, or multiple (e.g., 1, 2, 3, 4, or 5) variable temperatures. The heating temperature can be gradually increased or increased or decreased in steps of a set temperature span. The heating temperature can also be increased first, then decreased, and then increased again. For example, the temperature span can be set to 20-150°C per span, and 1, 2, 3, or 4 temperature spans can be provided.

[0046] Furthermore, the heating temperature in the second stage can be a constant temperature within the range of 760-950°C, or multiple (e.g., 1, 2, 3, 4, or 5) variable temperatures. The heating temperature can be gradually increased or increased or decreased in steps of a set temperature span. The heating temperature can also be increased first, then decreased, and then increased again. For example, the temperature span can be set to 30-150°C per span, and 1, 2, 3, or 4 temperature spans can be provided.

[0047] Furthermore, in the manufacturing method of the hot stamping parts described in the present invention, the second stage heating time is controlled to t=a+150(d-0.8), where d represents the thickness of the zinc-based coated steel plate, and its unit parameter is mm, a represents the time correction value, and its value range is 50-120, and the unit parameter of t is s.

[0048] Furthermore, in the method for manufacturing hot stamping parts of the present invention, the heating temperature in the first stage is 450-650°C.

[0049] Furthermore, in the manufacturing method of the hot stamping parts described in the present invention, during the cooling and stamping steps, from the time when the mold and the zinc-coated steel plate are just in contact until the end of stamping, the mold closing speed is controlled to be 20-300 mm / s and the cooling rate is controlled to be 15-100°C / s.

[0050] Furthermore, in the manufacturing method of the hot stamping parts described in the present invention, the zinc-based coated steel plate is prepared by the following steps: steelmaking, hot rolling, cold rolling, annealing and hot-dip galvanizing, and flattening; wherein in the hot rolling step, the coiling temperature is controlled to be 500-700°C; wherein in the annealing and hot-dip galvanizing steps, the annealing temperature is controlled to be 700-810°C, the plating solution temperature is 400-600°C, and the cooling rate of the steel plate after leaving the zinc pot is 5-30°C / s.

[0051] Furthermore, in the method for manufacturing hot stamping parts of the present invention, in the cold rolling step, the cold rolling deformation is controlled to be 10-70%.

[0052] The zinc-based coated steel sheet, hot stamping component and manufacturing method thereof of the present invention have the following advantages and beneficial effects:

[0053] (1) Compared with conventional zinc-based coated steel sheets, the zinc-based coated steel sheets of the present invention can be directly hot stamped. For complex formed parts, there is no need to cold stamp the coated steel sheets to a certain degree before hot stamping, which can greatly improve production efficiency and reduce production costs.

[0054] (2) Compared with the traditional hot stamping method, the stamping method of the present invention can realize continuous heating, cooling and forming, and does not require pre-cooling of the blank before forming, thereby ensuring good formability of the blank;

[0055] (3) The hot stamping component of the present invention has a coating comprising a surface layer and a ZnFe alloy layer, wherein the zinc oxide content in the surface layer is 5 to 50% and the manganese oxide content is less than 5%, thereby enabling the hot stamping component to have excellent weldability, paintability, and corrosion resistance;

[0056] (4) The hot stamped component of the present invention has a ZnFe alloy layer comprising a first ZnFe alloy phase having an Fe content of no more than 25% and a second ZnFe alloy phase having an Fe content of 50-70%. This allows the hot stamped component to have excellent corrosion resistance and also inhibits the generation and propagation of cracks in the coating.

[0057] (5) The hot stamping parts of the present invention have good corrosion resistance, especially notch corrosion protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] FIG1 shows a cross-sectional coating structure of a hot stamped component according to Example 6 of the present invention. DETAILED DESCRIPTION

[0059] The zinc-based coated steel sheet, hot stamping component and manufacturing method thereof described in the present invention will be further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments. However, such explanation and illustration do not constitute an undue limitation to the technical solution of the present invention.

[0060] The embodiments of the present invention adopt the following steps to produce hot stamping parts:

[0061] (1) Steelmaking, hot rolling, cold rolling, annealing and hot-dip galvanizing, and flattening to produce a zinc-coated steel sheet. The zinc-coated steel sheet comprises a steel substrate and a zinc-coated layer coated on the surface of the steel substrate, wherein the mass percentage of Zn in the zinc-coated layer is ≥50%, the mass percentage of Al+Mg is <50%, and the thickness of the zinc-coated layer is 3-15 microns. Table 1 lists the composition and thickness of the zinc-coated layer in each embodiment. Table 2 lists the mass percentage ratios of each chemical element in the steel substrate of the zinc-coated steel sheet in each embodiment.

[0062] In the hot rolling step, the coiling temperature is controlled to be 500-700°C. In the annealing and hot-dip galvanizing steps, the annealing temperature is controlled to be 700-810°C, the plating bath temperature is controlled to be 400-600°C, and the plating bath composition is Al: 0.0001-50%, Mg: 0.0001-10%, and Si: 0-5%, wherein the Al / Mg ratio is 1-10000, and the balance is Zn and unavoidable impurities (see Table 2). The cooling rate of the steel plate after leaving the zinc pot is 5-30°C / s.

[0063] In some embodiments, in the cold rolling step, the cold rolling deformation is controlled to be 10-70%.

[0064] (2) The zinc-coated steel sheet is heated in two stages, wherein the heating temperature of the first stage is 350-750°C. The heating temperature of the first stage can be a constant temperature within the range of 350-750°C, or multiple variable temperatures. The heating temperature can be gradually increased or increased or decreased in a set temperature span. The heating temperature can also be increased first, then decreased, and then increased again. The heating time of the first stage is 10-600s; wherein the heating temperature of the second stage is 760-950°C. The heating time t of the second stage is related to the thickness of the sheet. In some embodiments, t = a + 150 (d - 0.8), wherein d represents the thickness of the zinc-coated steel sheet, and its unit parameter is mm, a represents the time correction value, and its value range is 50-120, and the unit parameter of t is s.

[0065] (3) The zinc-coated steel sheet is transferred to the mold and cooled and stamped simultaneously. During the period from when the mold and the zinc-coated steel sheet are just fitted to the end of stamping, the mold closing speed is controlled to be 20-300 mm / s and the cooling rate is controlled to be 15-100°C / s.

[0066] Table 1 lists the structural parameters of the zinc-based coated steel sheets of Examples 1-6.

[0067] Table 1

[0068] Table 2

[0069] Table 3 lists the mass percentages of various chemical elements in the steel substrates of the zinc-based coated steel sheets of Examples 1-6.

[0070] Table 3 (wt%, the balance is Fe and other inevitable impurities except P and S)

[0071] Table 4 lists the manufacturing process parameters of the zinc-based coated steel sheets of Examples 1-6.

[0072] Table 4

[0073] Table 5 lists the manufacturing process parameters of the hot stamping parts of Examples 1-6.

[0074] Table 5

[0075] Note: There are several temperature values ​​in the corresponding grids in Table 1, indicating that the heating temperature changes according to this arrangement.

[0076] Accordingly, the finished hot stamping parts prepared in Examples 1-6 were sampled and their microstructures were tested. The relevant test results are listed in Table 6 below, where the contents of zinc oxide and manganese oxide in the surface layer were obtained by XRD or EDS analysis, and the Fe content in the first ZnFe alloy phase and the second ZnFe alloy phase in the ZnFe alloy layer was obtained by EDS analysis.

[0077] Table 6

[0078] As can be seen from Table 6 above, the microstructure of the hot stamping parts of the present invention can be one or more of martensite, bainite, ferrite, and pearlite, and its specific composition is related to the chemical element composition of the steel substrate and the cooling rate in Table 5.

[0079] Table 6 also shows that the coating of the hot-stamped components in each example comprises a surface layer and a ZnFe alloy layer. The surface layer contains 5-50% zinc oxide by weight and less than 5% manganese oxide. The ZnFe alloy layer comprises a first ZnFe alloy phase with an Fe content of no more than 25% by weight and a second ZnFe alloy phase with an Fe content of 50-70% by weight. The second ZnFe alloy phase is closer to the steel substrate than the first ZnFe alloy phase. The Fe content in the coating of the hot-stamped components increases gradually from the surface to the steel substrate. Furthermore, using the same method, the aluminum oxide content in the surface layer of each example was found to be in the range of 1-50% by weight, and the magnesium oxide content was in the range of 0.5-10% by weight.

[0080] In addition, the inventors also sampled each embodiment to further test the corrosion resistance, adhesion and weldability of the hot stamping parts of each embodiment, and the test results are listed in Table 7.

[0081] The corrosion resistance rating is evaluated after 30 cycles using the Volkswagen standard PV1210 method, and is rated based on the corrosion depth and width, with level 5 representing the best and level 1 representing the worst.

[0082] The coating adhesion evaluation is based on GB / T9286-1998. The coating peeling is visually inspected using the grid method. The adhesion levels 0-5 decrease in sequence, with level 5 being the worst.

[0083] Weldability evaluation was conducted according to GM OEM standard GWS-5:2011, with the presence of weld spatter as the evaluation criterion.

[0084] Table 7

[0085] It can be seen from Table 7 that the hot stamping parts of various embodiments of the present invention have excellent corrosion resistance, excellent paint adhesion and good weldability.

[0086] In addition, FIG1 also shows a cross-sectional coating photograph of the hot stamping component according to Example 6 of the present invention.

[0087] As can be seen from Figure 1, the coating of the hot stamping component contains a first ZnFe alloy phase with an Fe content of no more than 25% and a second ZnFe alloy phase with an Fe content of 50-70%. The second ZnFe alloy phase is closer to the steel substrate and is complete and continuous, and the coating is also complete and continuous.

[0088] It should be noted that the combination of the various technical features in this case is not limited to the combination described in the claims of this case or the combination described in the specific embodiments. All technical features recorded in this case can be freely combined or combined in any way unless there is a contradiction between them.

[0089] It should also be noted that the embodiments listed above are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made therefrom that can be directly derived from or easily conceived by those skilled in the art based on the disclosure of the present invention are intended to fall within the scope of protection of the present invention.

Claims

1. A zinc-based coated steel sheet with excellent corrosion resistance, comprising a steel substrate and a zinc-based coating coated on the surface of the steel substrate, characterized in that: The mass percentage of Zn in the zinc-based coating is ≥50%, the mass percentage of Al+Mg is <50%, and the thickness of the zinc-based coating is 3-15 microns.

2. The zinc-based coated steel sheet according to claim 1, characterized in that: The zinc-based coating further contains Si, and / or the zinc-based coating has a thickness of 5-10 microns.

3. The zinc-based coated steel sheet according to claim 1, characterized in that: The chemical elements mass percentage of the steel substrate are: C: 0.05-0.5%, Si: 0.01-2.0%, Mn: 0.3-3.0%, Al: 0.005-0.3%, Ti≤0.1%, B≤0.1%, Cr≤0.5%, Nb≤0.1%, V≤0.1%, Ni≤0.5%, Mo≤0.5%, and the balance is Fe and unavoidable impurities.

4. The zinc-based coated steel sheet according to claim 3, characterized in that: Among the inevitable impurities of the steel substrate, P≤0.3% and S≤0.1%.

5. A hot stamping component, characterized in that: The hot stamping component comprises a steel substrate and a coating coated on the surface of the steel substrate, wherein the coating comprises a surface layer and a ZnFe alloy layer; wherein the mass percentage of zinc oxide in the surface layer is 5-50%, and the content of manganese oxide is less than 5%; wherein the ZnFe alloy layer comprises a first ZnFe alloy phase with a mass percentage of Fe not exceeding 25%, and a second ZnFe alloy phase with a mass percentage of Fe being 50-70%, and the mass percentage of Fe in the coating of the hot stamping component gradually increases from the surface to the steel substrate.

6. The hot stamped component according to claim 5, characterized in that In the surface layer, the mass percentage of aluminum oxide is 1-50%, and the mass percentage of magnesium oxide is 0.5-10%; and / or, the area of ​​the first ZnFe alloy phase occupies 5-50% of the coating area, and the area of ​​the second ZnFe alloy phase occupies 40-90% of the coating area.

7. The hot stamped component according to claim 5, characterized in that The hot stamping component is obtained by directly hot stamping the zinc-based coated steel sheet according to any one of claims 1 to 4.

8. The hot stamping component according to any one of claims 5 to 7, characterized in that: Its microstructure has at least one of martensite, bainite, ferrite and pearlite.

9. The method for manufacturing a zinc-based coated steel sheet according to any one of claims 1 to 4, characterized in that: The process includes: steel making, hot rolling, cold rolling, annealing and hot-dip galvanizing, and leveling; In the hot rolling step, the coiling temperature is controlled to be 500-700°C; in the annealing and hot-dip galvanizing steps, the annealing temperature is controlled to be 700-810°C, the plating solution temperature is 400-600°C, and the cooling rate of the steel plate after leaving the zinc pot is 5-30°C / s.

10. The method for manufacturing a zinc-based coated steel sheet according to claim 9, characterized in that: In the cold rolling step, the cold rolling deformation is controlled to be 10-70%; and / or, based on the total weight of the plating solution, the plating solution composition is: 0.0001-50% Al, 0.0001-10% Mg, 0-5% Si, and the remainder is Zn and unavoidable impurities, wherein the mass ratio of Al to Mg is Al / Mg in the range of 1 to 10000.

11. The method for manufacturing a hot stamped part according to claim 9 or 10, characterized in that: Includes steps: Producing the zinc-based coated steel sheet; The zinc-based coated steel sheet is heated in the first stage, wherein the first stage heating temperature is 350-750° C., and the first stage heating time is 10-600 s; The zinc-based coated steel sheet is subjected to second-stage heating, wherein the second-stage heating temperature is 760-950° C., and the second-stage heating time is adjusted according to the thickness of the zinc-based coated steel sheet; The zinc-coated steel sheet is transferred to a die for simultaneous cooling and stamping.

12. The method for manufacturing a hot stamped component according to claim 11, wherein: The second stage heating time is controlled to be t=a+150(d-0.8), wherein d represents the thickness of the zinc-based coated steel plate, and its unit parameter is mm, a represents the time correction value, and its value range is 50-120, and the unit parameter of t is s.

13. The method for manufacturing a hot stamped component according to claim 11, wherein: The heating temperature in the first stage is 450-650°C.

14. The method for manufacturing a hot stamped component according to claim 11, wherein: In the cooling and stamping steps, during the period from when the mold and the zinc-based coated steel plate are just fitted to the end of stamping, the mold closing speed is controlled to be 20-300 mm / s and the cooling rate is controlled to be 15-100°C / s.

15. The method for manufacturing a hot stamped component according to claim 11, wherein: The zinc-based coated steel sheet is prepared by the method according to claim 9 or 10.