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CN109112359A - Zinc-based coated steel sheet, manufacturing method thereof, hot forming method and component - Google Patents

Zinc-based coated steel sheet, manufacturing method thereof, hot forming method and component Download PDF

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Publication number
CN109112359A
CN109112359A CN201710494603.5A CN201710494603A CN109112359A CN 109112359 A CN109112359 A CN 109112359A CN 201710494603 A CN201710494603 A CN 201710494603A CN 109112359 A CN109112359 A CN 109112359A
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China
Prior art keywords
hot
zinc
steel sheet
coating
coated steel
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Inventor
吕家舜
杨洪刚
周芳
王永明
徐承明
李锋
刘仁东
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Priority to CN201710494603.5A priority Critical patent/CN109112359A/en
Publication of CN109112359A publication Critical patent/CN109112359A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/02—Alloys based on zinc with copper as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/04—Alloys based on zinc with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—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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    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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    • 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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    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
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    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Chemical Kinetics & Catalysis (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

本发明公开一种锌基镀层钢板及其制造方法、热成型方法和部件，在热压成型后钢板的强度大于1500MPa，伸长率大于5％。镀层完全转变成铁合金层，没有镀层蒸发现象，没有液相侵蚀现象，无硬质的Fe‑Al金属间化合物。部件的组织为马氏体+铁素体+残余奥氏体。The invention discloses a zinc-based coated steel sheet, a manufacturing method, a hot forming method and components thereof. The strength of the steel sheet after hot pressing is greater than 1500 MPa and the elongation is greater than 5%. The coating is completely transformed into an iron alloy layer, and there is no evaporation of the coating, no liquid phase erosion, and no hard Fe-Al intermetallic compounds. The structure of the component is martensite + ferrite + retained austenite.

Description

A kind of Zn-based plating layer steel plate and its manufacturing method, thermoforming process and component
Technical field
The present invention relates to a kind of clad steel sheet, in particular to a kind of Zn-based plating layer steel plate and its manufacturing method, thermoforming side Method and component.
Background technique
For a long time, steel is always the basis of auto industry, although aluminium alloy in automobile manufacture, magnesium alloy, plastics and The dosage of composite material is continuously increased, but high loss of weight potentiality, high impact absorption energy, high fatigue that high strength steel has with it are strong The advantages such as degree, high-mouldability and low degree anisotropy, have become the light-weighted main material of auto industry.The vapour of 21 century Garage's industry is to reduce fuel consumption, reduce CO2Become the major demands of society with exhaust gas discharge, to adapt to this development trend, Steel had developed high-strength steel sheet such as DP, TRIP, CP, QP steel of numerous species already to help to mitigate vehicle weight, mentioned simultaneously The safety of high automobile.The problems such as to take into account lightweight and crashworthiness and high-intensitive lower stamping parts rebound and die wear, Thermoforming high strength steel and its moulding process and application technology are come into being.The U-NCAP that reaches all at present collides 4 stars or 5 stars Horizontal riding vehicle, safety member (A/B/C column, bumper, collision prevention girders etc.) majority use tensile strength for 1500MPa, Yield strength is the thermoforming high strength steel of 1200MPa.Meanwhile to solve crackle and shape freezing in high strength steel cold forming , there is heat stamping and shaping material, has carried out the system that intensity is up to 1470MPa grades of automobile components with it in the problems such as property is bad It makes.
Thermoforming process process are as follows: the hot-forming steel plate that intensity under room temperature is 500-600MPa is heated to 880- first 950 DEG C, it is allowed to uniform austenitic, punch forming in the internal mold with cooling system is then fed into, is quickly cooled down simultaneously Quenching, is changed into martensite for austenite, hardens stamping parts, increase substantially intensity.This process is referred to as " punching press Hardening " technology.In actual production, drop stamping technique is divided into direct technique and indirect processes again, after direct technique, that is, blanking directly Steel plate heating is then punched into type, is mainly used for simple shape and the lesser workpiece of deformation extent；For complex-shaped or drawing The biggish workpiece of depth is then needed using indirect processes, i.e., first that the steel plate progress of lower honest material is preforming, is then reheated real Heat application punching press.
Existing thermoforming process makes entire part in heating and thermal insulation and subsequent punching press cooling procedure, and steel plate is equal It is exposed in air, generates very serious oxidation.To protect steel plate, the method generallyd use now is to plate one layer in surface of steel plate Protect the coat of metal, there are commonly it is zinc-plated, aluminize, but all there are some problems, it is zinc-plated to be easy to happen liquid metal coating pair The erosion of steel plate, and be easy to evaporate；Subsequent handling can be influenced in the iron aluminide of surface of steel plate one layer of hard of formation by aluminizing.
Summary of the invention
In order to overcome drawbacks described above, the object of the present invention is to provide a kind of Zn-based plating layer steel plate and its manufacturing method, heat at Type method and component, the hot-forming steel plate produced using this method, can be to steel plate during heating, heat preservation, punching press And subsequent use process provides good protection, and liquid phase will not be caused to corrode steel plate itself.
Object of the present invention is to what is realized by following technical solution:
A kind of Zn-based plating layer steel plate, including substrate and coating, it is characterised in that: coating chemical component is by mass percentage Are as follows: Al0.10~0.50%, Mg≤3%, Si≤0.50%, Ti≤0.50%, Sb≤0.50%, Cu≤2.00%, Re≤ 0.10%, one or more of Mn≤3.0%, Ca≤1.00%, Sn≤0.50%, remaining is Zn；
The substrate chemical element is by mass percentage are as follows: C0.10%~0.60%, Si0.05%~3.5%, Mn1.20%~10.50%, P≤0.50%, S≤0.05%, Al0.02%~4.00%, Ti≤0.20%, B≤0.007%, Cr≤0.50%, Mo≤1.50%, Cu≤0.80%, Ni≤2.0%, Nb≤0.20% and Fe are inevitable with some other Impurity；The ratio of Mn/Si should be not less than 3.
A kind of manufacturing method of Zn-based plating layer steel plate, including smelting, casting, hot rolling and hot-dip, it is characterised in that described Hot rolling technology are as follows: 1220 ± 20 DEG C heating, keep the temperature 180 ± 30 minutes, 1100 ± 20 DEG C of roughing, 1060 ± 20 DEG C of finish rolling, 870 ± 20 DEG C of finish to gauges, 500~650 DEG C are batched；The or immersion are as follows: zinc pot temperature is 450~520 DEG C；If hot-rolled substrate Hot-dip is carried out, heating and temperature control is at 500~700 DEG C；If cold-rolled substrate carries out hot-dip, first in 600-750 DEG C of oxidation Property atmosphere under to surface of steel plate carry out pre-oxidation treatment, then heating and temperature control is at 750~900 DEG C.Pre-oxidation treatment purpose It is so that oxidation film of one layer of the surface of steel plate generation based on the oxide of iron, restores during subsequent heating and heat preservation Viability iron, active iron are easy to alloy-layer of the reaction production of the aluminium element in same zinc pot based on ferro-aluminum.
Steel plate is heated to 850~950 DEG C of temperature range, heating speed by a kind of thermoforming process of Zn-based plating layer steel plate Control is spent in 15 DEG C/s hereinafter, keeping the temperature 3-15 minutes, carries out thermoforming later, and the cooling rate during thermoforming is greater than 20 DEG C/s, cooling outlet temperature control is at 150~350 DEG C.
Component made from a kind of Zn-based plating layer steel plate, surface of steel plate is followed successively by iron-based solid by steel matrix to surface after thermoforming Solution layer, intermetallic compounds layer and oxide skin(coating), the intermetallic compounds layer is based on Fe-Zn compound；Described Oxide skin(coating) is based on aluminium oxide, zinc oxide.Tissue is martensite+ferrite+retained austenite.
Iron-based solid solution layer is dissolved among iron matrix by the elements diffusion in coating, but the crystalline substance without changing iron Lattice structure, transition zone of this layer between iron matrix and coating；Intermetallic compounds layer, ferro element diffuse into coating and with plating Reaction forms intermetallic compound between element in layer, and the layer is based on Fe-Zn compound, simultaneously containing other in coating Element；Oxide layer, this layer are that the element in coating is anti-with the oxygen in air in the heating of drop stamping and insulating process The oxide that should be generated, this layer of oxide is based on aluminium oxide, zinc oxide.
The effect of element in coating:
The corrosion resistance of coating can be improved in the addition of Al:Al, can form Fe-Al's between coating and steel matrix Intermetallic compound hinders the undue growth of Fe-Zn brittlement phase, improves ductility of electrodeposited film.
The addition of Mg:Mg element, can greatly improve the Corrosion Protection of coating, prevent the generation of coating spot corrosion, can be with Crystal grain is refined, the compound of binary and ternary is generated with Zn and Al.The toughness for improving coating, can inhibit the corrosion of chloride.
Si:Si is enriched in intermetallic compounds layer, so that Fe, Zn atom are hindered by the counterdiffusion of liquid channel phase Hinder, compact inhibition layer tissue can be formed, the liquid phase of steel matrix is corroded so that eliminating coating to mitigate, can be refined The tissue of coating improves coating performance.
The corrosion resistance of coating can be improved in the addition of Ti:Ti, and in addition Ti can form the protective film of titanium oxide, the guarantor Cuticula is strong with basal body binding force, and protective value is good, and can be with self-healing breakage.Si and Ti is added simultaneously, can be generated more Compact inhibition layer improves the ability of the anti-aqueous etching of steel plate.
The effect of Ca:Ca is similar to Mg, can improve the corrosion resistance of coating, refines coating microstructure, improves coating Toughness, the corrosion of chloride can be inhibited.
Sb: being able to suppress the undue growth of intermetallic alloy layer, while the phase composition of stable alloy layer, so that plating Fe-Zn alloying reaction can uniformly occur during drop stamping for layer, mitigate the influence of aqueous etching.
Cu:Cu can be individually added into coating, improve the corrosive nature of coating, can also be added together with Si element, be promoted Into
Si forms compact inhibition layer phase in the aggregation of reaction zone, and then improves the ability of the anti-aqueous etching of steel plate.
Re: improving the corrosion resistance of coating, refines crystal grain.
Mn: improving the corrosion resistance of coating, refines crystal grain.
Sn: improving the corrosion resistance of coating, forms oxide film protection coating.
The effect of element in steel:
C is maximum as intensity contribution of the main alloy element to quenching type martensite steel, and Mn and Si take second place.The ratio of Mn/Si Example should be greater than 4, it is therefore an objective to guarantee that the oxidation film that steel plate generates in Hot-dip aluminum-silicon annealing process will not influence hot-dip energy. To guarantee harden ability, it is added to Ti, Cr and B.The corrosion resisting property that Cu improves steel is added, and then prevents the infiltration of H, improves steel Resistance for delayed fracture.The addition of Mo, Nb, play the effect strengthened steel matrix and refine crystal grain, and the addition of Si, Al can inhibit The formation of cementite.
A kind of Zn-based plating layer thermoforming steel plate provided by the invention, the intensity of steel plate is greater than 1500MPa after hot-forming, Elongation is greater than 5%.Coating is completely converted into iron alloy layer, does not have coating Evaporation Phenomenon, does not have liquid phase erosion, no hard Fe-Al intermetallic compound.The tissue of component is martensite+ferrite+retained austenite.
Specific embodiment
It is illustrated combined with specific embodiments below:
Embodiment sees attached list 1,2,3.
The intensity of steel plate is greater than 1500MPa, and elongation is greater than 5%.Coating is completely converted into iron alloy layer, steams without coating It was found that as there is no liquid phase erosion, the Fe-Al intermetallic compound of no hard.The tissue of component be martensite+ferrite+ Retained austenite.
Subordinate list 1: the chemical element composition of embodiment coating
Subordinate list 2: the chemical component of embodiment steel
Subordinate list 3: the technological parameter and performance of embodiment steel

Claims (5)

1.一种锌基镀层钢板，包括基板和镀层，其特征在于：镀层化学成分按质量百分比为：Al0.10～0.50％、Mg≤3％，Si≤0.50％、Ti≤0.50％、Sb≤0.50％、Cu≤2.00％、Re≤0.10％、Mn≤3.0％、Ca≤1.00％、Sn≤0.50％中的一种或几种，其余为Zn。1. A zinc-based coated steel sheet, comprising a substrate and a coating, characterized in that: the chemical composition of the coating is by mass percentage: Al0.10～0.50%, Mg≤3%, Si≤0.50%, Ti≤0.50%, Sb≤ One or more of 0.50%, Cu≤2.00%, Re≤0.10%, Mn≤3.0%, Ca≤1.00%, Sn≤0.50%, and the rest is Zn. 2.根据权利要求1所述的锌基镀层钢板，其特征在于：所述的基板化学元素按质量百分比为：C0.10％～0.60％，Si0.05％～3.5％，Mn1.20％～10.50％，P≤0.50％，S≤0.05％，Al0.02％～4.00％，Ti≤0.20％，B≤0.007％，Cr≤0.50％，Mo≤1.50％，Cu≤0.80％，Ni≤2.0％，Nb≤0.20％以及Fe和其它一些不可避免的杂质；Mn/Si的比例应不小于3。2 . The zinc-based coated steel sheet according to claim 1 , wherein the chemical elements of the substrate are: C0.10%～0.60%, Si0.05%～3.5%, Mn1.20%～ 10.50%, P≤0.50%, S≤0.05%, Al0.02%～4.00%, Ti≤0.20%, B≤0.007%, Cr≤0.50%, Mo≤1.50%, Cu≤0.80%, Ni≤2.0% , Nb≤0.20% and Fe and some other inevitable impurities; the ratio of Mn/Si should not be less than 3. 3.一种根据权利要求1-2任意一项所述的锌基镀层钢板的制造方法，包括冶炼、铸造、热轧、热浸镀和热冲压，其特征在于所述的热轧工艺为：1220±20℃加热，保温180±30分钟，1100±20℃粗轧，1060±20℃精轧，870±20℃终轧，500～650℃卷取；所述的热浸镀工艺为：锌锅温度为450～520℃；若热轧基板进行热浸镀，加热温度控制在500～700℃；若冷轧基板进行热浸镀，先在600-750℃的氧化性气氛下对钢板表面进行预氧化处理，而后加热温度控制在750～900℃。3. a manufacturing method of a zinc-based coated steel sheet according to any one of claims 1-2, comprising smelting, casting, hot rolling, hot dip plating and hot stamping, wherein the hot rolling process is: Heating at 1220±20°C, holding for 180±30 minutes, rough rolling at 1100±20°C, finishing rolling at 1060±20°C, finishing rolling at 870±20°C, coiling at 500-650°C; the hot-dip plating process is: zinc The pot temperature is 450-520°C; if the hot-rolled substrate is subjected to hot-dip plating, the heating temperature is controlled at 500-700°C; if the cold-rolled substrate is subjected to hot-dip plating, the surface of the steel plate is first subjected to an oxidizing atmosphere of 600-750°C. Pre-oxidation treatment, and then the heating temperature is controlled at 750 ~ 900 ℃. 4.一种根据权利要求1-2任意一项所述的锌基镀层钢板的热成型方法，其特征在于将钢板加热到850～950℃的温度区间，加热速度控制在15℃/s以下，保温3-15分钟，之后进行热成型，热成型过程中的冷却速率大于20℃/s，冷却终点温度控制在150～350℃。4. A hot forming method for a zinc-based coated steel sheet according to any one of claims 1-2, characterized in that the steel sheet is heated to a temperature range of 850-950°C, and the heating rate is controlled below 15°C/s, Incubate for 3-15 minutes, and then perform thermoforming. The cooling rate in the thermoforming process is greater than 20°C/s, and the cooling end temperature is controlled at 150-350°C. 5.一种根据权利要求1-2任意一项所述的锌基镀层钢板制得的部件，其特征在于热成型后钢板表面由钢基体到表面依次为铁基固溶体层、金属间化合物层和氧化物层，所述的金属间化合物层以Fe-Zn化合物为主；所述的氧化物层以氧化铝、氧化锌为主；组织为马氏体+铁素体+残余奥氏体。5. A component made of the zinc-based coated steel sheet according to any one of claims 1-2, characterized in that the surface of the steel sheet after hot forming is successively composed of an iron-based solid solution layer, an intermetallic compound layer and a surface from the steel matrix to the surface. The oxide layer, the intermetallic compound layer is mainly composed of Fe-Zn compounds; the oxide layer is mainly composed of aluminum oxide and zinc oxide; the structure is martensite + ferrite + retained austenite.
CN201710494603.5A 2017-06-26 2017-06-26 Zinc-based coated steel sheet, manufacturing method thereof, hot forming method and component Pending CN109112359A (en)

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