CN106466697B - Hot stamped Steel products with an aluminum or aluminum alloy coating and method for the production thereof - Google Patents

Hot stamped Steel products with an aluminum or aluminum alloy coating and method for the production thereof Download PDF

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CN106466697B
CN106466697B CN201610664566.3A CN201610664566A CN106466697B CN 106466697 B CN106466697 B CN 106466697B CN 201610664566 A CN201610664566 A CN 201610664566A CN 106466697 B CN106466697 B CN 106466697B
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aluminum
layer
hot
alloy
stamped
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CN106466697A (en
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刘昕
洪振军
谭宁
金鑫焱
刘俊祥
洪继要
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C23C2/12—Aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Abstract

method for manufacturing steel hot stamping products with aluminum or aluminum alloy coating includes the steps of 1) blanking, processing the steel plate with aluminum or aluminum alloy coating into blanks with required shapes by adopting a blanking or laser cutting method, wherein the thickness of the steel plate with coating is not more than 2.8mm, 2) blank heat treatment, namely putting the blanks into a heating furnace for heating and heat preservation, the temperature of the heating furnace is 900-950 ℃, the oxygen content of the atmosphere in the heating furnace is ensured to be more than 15%, the total residence time of the blanks in the heating furnace is 2.5-10 minutes, 3) blank transmission, namely rapidly transmitting the heated blanks into a die for stamping, wherein the transmission time is 4-12 seconds, and the temperature of the blanks before stamping is 680-750 ℃, 4) blank hot stamping, namely directly stamping the hot blanks in the die, cooling the die in the stamping forming process, and ensuring that the surface temperature of the die before stamping is lower than 100 ℃.

Description

Hot stamped Steel products with an aluminum or aluminum alloy coating and method for the production thereof
Technical Field
The invention relates to a hot stamping product and a manufacturing method thereof, in particular to a steel hot stamping product with an aluminum or aluminum alloy coating and a manufacturing method thereof.
Background
In recent years, is a main development trend of the automobile industry, wherein hot stamping is common modes for realizing high strengthening of products, and the high strength of the products is realized by combining heat treatment and high-temperature forming.
Chinese patent CN101583486 discloses a hot stamping product of coated steel strip and method thereof, which includes heating, transferring and cooling, but does not involve the hot stamping process, including stamping parameters such as die closing speed, pressure maintaining time, etc., thereby causing the quality of the stamped product to be unstable, such as contraction, cracking, etc., and the furnace atmosphere is not controlled in the heating process, resulting in the atmosphere change in the furnace in the heating process, especially the oxygen content to be changed greatly, which makes the appearance color of the product to be changed easily, and the actual production finds that the appearance color of the stamped product is different greatly when the same incoming material is processed by the same process.
Chinese patent CN100370054 discloses a high-strength aluminum or aluminum alloy plated steel plate, emphasizing how to control the content of Cr and Mn in the plating layer to be more than 0.1% and influence on the corrosion resistance and heat resistance of the product, and not relating to the hot stamping process.
Chinese patent CN104384283 discloses a hot stamping forming process of 22MnB5 high-strength thin steel sheets, which mainly aims at bare-plate hot stamping steel, and the stamping process is not specifically described.
The Chinese patent CN103212950 also aims at a bare plate hot stamping product and also comprises post shot blasting and other treatments.
Disclosure of Invention
The invention aims to provide more excellent steel hot stamping products with aluminum or aluminum alloy coatings and a manufacturing method thereof, aiming at overcoming the defects of the existing steel hot stamping products with aluminum or aluminum alloy coatings, wherein the steel hot stamping products with the aluminum or aluminum alloy coatings have the characteristics of high strength, complex shape, good formability, high dimensional precision, small rebound and the like, and can be used for automobile parts, such as safety structural members of front and rear left and right crash bars (beams), front and rear bumpers, A column reinforcing plates, B column reinforcing plates, C column reinforcing plates, channels in floors, roof reinforcing beams and the like.
In order to achieve the purpose, the technical scheme of the invention is as follows:
Process for the production of a hot-stamped steel product coated with aluminium or an aluminium alloy, comprising the steps of:
1) blanking: processing the steel plate with the aluminum or aluminum alloy coating into a blank with a shape required by the part by adopting a blanking or laser cutting method; the thickness of the steel plate with the coating is not more than 2.8 mm;
2) blank heat treatment: putting the blank into a heating furnace for heating and heat preservation, wherein the temperature of the heating furnace is 900-950 ℃, the atmosphere in the heating furnace ensures that the oxygen content is more than 15%, and the total retention time of the blank in the heating furnace is 2.5-10 minutes;
3) blank conveying: rapidly conveying the heated blank into a die for stamping, wherein the conveying time is 4-12 seconds, and the temperature of the blank before stamping is guaranteed to be 680-750 ℃;
4) hot stamping of the blank: directly stamping the hot blank in a die to form, and cooling the die in the stamping process to ensure that the surface temperature of the die before stamping is lower than 100 ℃.
, the steel plate with coating comprises C0.08-0.8 wt%, Si 0.05-1.0 wt%, Mn 0.1-5 wt%, P0.3 wt%, S0.1 wt%, Al 0.3 wt%, Ti 0.5 wt%, B0.0005-0.1 wt%, Cr 0.01-3 wt%, and Fe and inevitable impurities in balance.
Preferably, the steel plate with the coating comprises the following components in percentage by weight: c: 0.1-0.6%, Si: 0.07 to 0.7%, Mn: 0.3-4%, P < 0.2%, S < 0.08%, Al < 0.2%, Ti < 0.4%, B: 0.0005 to 0.08%, Cr: 0.01-2%, and the balance of Fe and inevitable impurities.
Preferably, the steel plate with the coating comprises the following components in percentage by weight: c: 0.15-0.5%, Si: 0.1 to 0.5%, Mn: 0.5-3%, P < 0.1%, S < 0.05%, Al < 0.1%, Ti: < 0.2%, B: 0.0005 to 0.08%, Cr: 0.01-1%, and the balance of Fe and inevitable impurities.
Preferably, the plating layer is pure aluminum or aluminum alloy, and the hot-dip coating solution for coating the plating layer on the steel plate comprises the following components in percentage by weight: si: 5-11%, Fe: 0-4%, the balance being aluminum and unavoidable impurities.
Preferably, the plating layer is pure aluminum or aluminum alloy, and the hot-dip coating solution for coating the plating layer on the steel plate comprises the following components in percentage by weight: si: 9-10%, Fe: 2-4%, the balance being aluminum and unavoidable impurities.
Preferably, the difference between the maximum value and the minimum value of the coating thickness values measured at different positions in the width direction of the upper surface and the lower surface of the steel sheet with a coating is not more than 5 μm.
Preferably, in the step 2), the atmosphere in the heating furnace is air or a mixed gas of air and inert gas, and the oxygen content in the atmosphere is always more than 15%.
Preferably, in the step 2), the temperature of the heating furnace is 900-950 ℃, and preferably the temperature of the heating furnace is 935-950 ℃ or 945-950 ℃.
Preferably, the residence time in the heating furnace in the step 2) is 2.5-10 min, and the residence time in the heating furnace is 2.5-5 min.
Preferably, when the thickness of the steel plate with the aluminum or aluminum alloy coating is less than 1.5mm, the temperature of the heating furnace is 900-950 ℃, and the retention time in the heating furnace is 2.5-10 min; preferably: the temperature of the heating furnace is 900-930 ℃, and the retention time in the heating furnace is 3-10 min; or the temperature of the heating furnace is 935-950 ℃, and the retention time in the heating furnace is 2.5-5 min; or the temperature of the heating furnace is 945 to 950 ℃, and the retention time in the heating furnace is 2.5 to 5 min.
Preferably, when the thickness of the steel plate with the aluminum or aluminum alloy coating is 1.5-2.0 mm, the temperature of the heating furnace is 900-950 ℃, and the retention time in the heating furnace is 2.5-10 min; preferably: the temperature of the heating furnace is 900-930 ℃, and the retention time in the heating furnace is 3-10 min; or the temperature of the heating furnace is 935-950 ℃, and the retention time in the heating furnace is 2.5-6 min; or the temperature of the heating furnace is 945 to 950 ℃, and the retention time in the heating furnace is 2.5 to 5 min.
Preferably, when the thickness of the steel plate with the aluminum or aluminum alloy coating is 2.0-2.8 mm, the temperature of the heating furnace is 900-950 ℃, and the retention time in the heating furnace is 2.5-10 min; preferably: the temperature of the heating furnace is 900-930 ℃, and the retention time in the heating furnace is 3.5-10 min; or the temperature of the heating furnace is 935-950 ℃, and the retention time in the heating furnace is 2.5-6 min; or the temperature of the heating furnace is 945 to 950 ℃, and the retention time in the heating furnace is 2.5 to 5 min.
Preferably, in the heating process of the blank in the step 2), an induction heating mode is adopted when the heating temperature is more than 700 ℃.
Preferably, in the step 4), the mold clamping speed during stamping is 30-150 mm/s, and preferably 50-100 mm/s.
Preferably, in the step 4), in the stamping process, after the die is closed, the pressure maintaining quenching is continuously carried out for 4-20 s, and the pressure maintaining pressure applied to the part is larger than 8MPa on the surface of the part on average.
Preferably, in the step 4), the die steel used by the die is made of: a thermal diffusivity of greater than 3.8m at 700 DEG C2/s。
Preferably, in the step 4), a cooling system is arranged inside the die or a natural cooling mode is adopted for cooling the die in the stamping process.
Preferably, in the step 4), the part after press forming is cooled to 300 ℃ or lower.
Preferably, in the step 4), the microstructure of the steel plate after stamping is more than 95% of martensite structure, and the tensile strength is more than 1300 MPa.
Preferably, in the step 4), the plated layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
The steel hot stamping product obtained by the manufacturing method is a steel plate with a coating, the surface of the steel plate is coated with an aluminum or aluminum alloy coating, and the steel plate comprises the following components in percentage by weight: c: 0.08-0.8%, Si: 0.05-1.0%, Mn: 0.1-5%, P < 0.3%, S < 0.1%, Al < 0.3%, Ti < 0.5%, B: 0.0005 to 0.1%, Cr: 0.01-3%, and the balance of Fe and inevitable impurities.
Preferably, the steel plate with the coating comprises the following components in percentage by weight: c: 0.1-0.6%, Si: 0.07 to 0.7%, Mn: 0.3-4%, P < 0.2%, S < 0.08%, Al < 0.2%, Ti < 0.4%, B: 0.0005 to 0.08%, Cr: 0.01-2%, and the balance of Fe and inevitable impurities.
Preferably, the steel plate with the coating comprises the following components in percentage by weight: c: 0.15-0.5%, Si: 0.1 to 0.5%, Mn: 0.5-3%, P < 0.1%, S < 0.05%, Al < 0.1%, Ti: < 0.2%, B: 0.0005 to 0.08%, Cr: 0.01-1%, and the balance of Fe and inevitable impurities.
Preferably, the plating layer comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plating layer is not more than 50 μm.
Preferably, the plating layer comprises an alloy layer, an Al-rich intermetallic compound layer, an intermediate layer and a surface layer from the steel substrate to the outside, and the alloy layer comprises the following main components in percentage by weight: si: 0-6%, Fe: 75-96%, Al: 2 to 12 percent; the Al-rich intermetallic compound layer comprises the following main components in percentage by weight: si: 0-2%, Fe: 30-50%, Al: 40-60 percent; the weight percentage of the main components of the middle layer is as follows: si: 2-6%, Fe: 50-65%, Al: 20 to 35 percent; the main components of the surface layer are as follows by weight percent: si: 2-6%, Fe: 50-65%, Al: 20 to 35 percent.
Preferably, the plating layer comprises an alloy layer, an Al-rich intermetallic compound layer, an intermediate layer and a surface layer from the steel substrate to the outside, and the alloy layer comprises the following main components in percentage by weight: si: 0-6%, Fe: 75-96%, Al: 2 to 12 percent; the Al-rich intermetallic compound layer comprises the following main components in percentage by weight: si: 0-2%, Fe: 30-50%, Al: 40-60 percent; the weight percentage of the main components of the middle layer is as follows: si: 2-6%, Fe: 50-65%, Al: 20 to 35 percent; the main components of the surface layer are as follows by weight percent: si: 2-6%, Fe: 50-65%, Al: 20 to 35 percent.
Preferably, the microstructure of the steel sheet is a martensite structure of 95% or more, and the tensile strength is greater than 1300 MPa.
The microstructure of the coating of the steel plate with the coating is divided into an alloy layer and a surface layer, wherein the alloy layer is a transition layer adjacent to a substrate, the transition layer is formed by high alloying with the substrate iron, and the surface layer is arranged on the alloy layer, and the composition of the surface layer depends on the composition of the selected plating solution.
The requirement on the uniformity of the thickness of the coating on the surface of the steel plate with the coating is good, namely the difference between the maximum value and the minimum value of the thickness values of the coating measured at different positions in the width directions of the upper surface and the lower surface of the steel plate is not more than 5 mu m under the same set condition of .
In the step 2), the atmosphere in the heating furnace is air or mixed gas consisting of air and inert gas, the oxygen content in the atmosphere is always more than 15% in the production and use process, the oxygen content is relatively constant in the production process, and when the oxygen content is less than 15%, the oxygen content can be supplemented properly according to needs, otherwise the formation and distribution of oxides on the surface of a coating can be influenced, the appearance of a product is influenced finally, and the color of the product is influenced most directly.
In the step 4), the die closing speed of the die is 30-150 mm/s during stamping, so that the part can ensure good forming performance, and the occurrence of stamping defects such as cracking, necking and the like is reduced.
In the step 4), the part is cooled to below 300 ℃, so that the internal structure of the part is changed into the structure required by the target part, and meanwhile, the part is kept to be in a good size and shape in the cooling process.
Meanwhile, in the existing stamping process is carried out in the air, the furnace atmosphere is not controlled, and the surface of the product is oxidized in a furnace chamber in the stamping process, so that the furnace chamber atmosphere such as oxygen content changes, the oxygen content changes affect the composition of oxidation products on the surface of a final product, the appearance color of the product is further affected, the product appearance color is not uniform or is not , moreover, in the hot stamping process, the higher the temperature of a die is, oxide skin exists on the surface of the plate, the cooling speed of the plate is reduced, a martensite layer becomes coarse, the performance is reduced, and the quality of the surface of the plate is deteriorated, for example, the influence of the cold speed on the performance of high-strength plastic boron steel in the hot stamping process is reported in the report of materials research institute at volume No. 28, volume No. 2 of 2014.
In addition, the temperature of the die is at room temperature or below 50 ℃, so that higher cooling rate can be ensured, and the comprehensive performance of the surface of a hot stamping part and a product is improved.
The invention has the beneficial effects that:
according to the invention, the stamped product obtained by using the steel plate with the coating of in the hot stamping process of has uniform appearance color and appearance, and does not or rarely have the defects of shrinkage, necking, cracking and the like.
The hot stamping product with the coating has the characteristics of high strength, complex shape, good formability, high dimensional precision, small rebound and the like, and can be used for automobile parts, such as safety structural parts of front and rear left and right bumper bars (beams), front and rear bumpers, A column reinforcing plates, B column reinforcing plates, C column reinforcing plates, floor middle channels, roof reinforcing beams and the like.
Drawings
FIG. 1 shows the appearance of a hot stamped product with a coating, which is obtained by the same hot stamping process with the same incoming material and the same hot stamping process, and has a larger difference in appearance;
FIG. 2 is a photograph of the surface of a part with different colors of a prior art hot stamping product with a coating;
FIG. 3 is a photograph showing the appearance of a hot stamped product according to example 1 of the present invention;
FIG. 4 is a metallographic phase of a plated section of a hot stamped product according to example 1 of the present invention;
FIG. 5 is a metallographic phase of a plated section of a hot stamped product according to example 2 of the present invention;
FIG. 6 is a surface SEM topography of a hot-stamped product as described in example 3 of the invention;
FIG. 7 is an SEM image of the coating section of the hot-stamped product in example 8 of the invention.
Detailed Description
The invention is further with reference to the figures and examples.
Table 1 shows the composition of steel sheets according to examples of the present invention; table 2 shows the manufacturing process of the inventive example; table 3 shows the properties of examples of hot-stamped products according to the invention.
Example 1
Laser blanking a 1.2mm steel plate with an aluminum alloy coating into blanks with the size and the shape of , wherein the hot dip coating plating solution comprises 8.5% of Si, 2.6% of Fe and the balance of aluminum and inevitable impurities, the blanks enter a heating furnace, the temperature of the heating furnace is 950 ℃, the retention time is 3.5min, the oxygen content of the atmosphere in the furnace is 20%, the blanks are conveyed to a die within 10s, the die closing speed is 100mm/s, the pressure maintaining time is 10s and the pressure maintaining pressure is 10MPa, the appearance of the obtained product is shown in figure 3, the microstructure of the cross section of the coating is shown in figure 4, the martensite proportion in the microstructure of the substrate of the obtained hot stamped product is higher than 95%, the hardness HV10 is 450, the total thickness of the coating is 43.
Example 2
Laser blanking a 0.9mm steel plate with an aluminum alloy coating into a blank with the size and the shape of , wherein the hot dip coating plating solution comprises 8.3% of Si, 2.4% of Fe and the balance of aluminum and inevitable impurities, the blank enters a heating furnace, the temperature of the heating furnace is 940 ℃, the retention time is 5min, the oxygen content of the atmosphere in the furnace is 22%, the blank is conveyed to a die within 5s, the die closing speed is 50mm/s, the pressure maintaining time is 4s, and the pressure maintaining pressure is 8MPa, the martensite proportion in the microstructure of the obtained hot stamping product substrate is higher than 97%, the hardness HV10 is 480, the total thickness of the coating is 50 mu m, the thickness of an alloy layer is 15 mu m, and the microstructure of the.
Example 3
Laser blanking a 1.0mm steel plate with an aluminum alloy coating into blanks with sizes and shapes, wherein the hot dip coating plating solution comprises 9.0% of Si, 2.7% of Fe and the balance of aluminum and inevitable impurities, the blanks enter a heating furnace, the temperature of the heating furnace is 930 ℃, the residence time is 7min, the oxygen content of the atmosphere in the furnace is 18%, the blanks are conveyed to a die within 8s, the die closing speed is 70mm/s, the pressure maintaining time is 6s, the pressure maintaining pressure is 12MPa, the martensite proportion in the microstructure of the obtained hot stamping product substrate is higher than 96%, the hardness HV10 is 490, the total thickness of the coating is 41 mu m, the thickness of the alloy layer is 11 mu m, and figure 6 shows that the surface SEM appearance of the hot stamping product is fixed uneven, and the subsequent coating is facilitated.
Example 4
Laser blanking a 0.9mm steel plate with an aluminum alloy coating into blanks with the size and the shape of , wherein the hot dip coating plating solution comprises 8.8% of Si, 2.7% of Fe and the balance of aluminum and inevitable impurities, the blanks enter a heating furnace, the temperature of the heating furnace is 920 ℃, the retention time is 7min, the oxygen content of the atmosphere in the furnace is 20%, the blanks are conveyed to a die within 8s, the die closing speed is 70mm/s, the pressure maintaining time is 6s, the pressure maintaining pressure is 15MPa, the proportion of martensite in the microstructure of the obtained hot stamping product substrate is higher than 98%, the hardness HV10 is 440, the total thickness of the coating is 39 mu m, and the thickness of an alloy layer is.
Example 5
Laser blanking a 1.1mm steel plate with an aluminum alloy coating into a blank with the size and the shape of , wherein the hot dip coating plating solution comprises 10% of Si, 3.5% of Fe and the balance of aluminum and inevitable impurities, the blank enters a heating furnace, the temperature of the heating furnace is 935 ℃, the retention time is 4.5min, the oxygen content of the atmosphere in the furnace is 22%, the blank is conveyed to a die within 7s, the die assembly speed of an upper die and a lower die is 80mm/s, the pressure maintaining time is 5s, the pressure maintaining pressure is 15MPa, the proportion of martensite in the microstructure of the obtained hot stamping product substrate is higher than 95%, the hardness HV10 is 460, the total thickness of the coating is 41 mu m, and.
Example 6
Laser blanking a 1.5mm steel plate with an aluminum alloy coating into a blank with the size and the shape of , wherein the hot dip coating plating solution comprises 10% of Si, 3.5% of Fe and the balance of aluminum and inevitable impurities, the blank enters a heating furnace, the temperature of the heating furnace is 935 ℃, the retention time is 5min, the oxygen content of the atmosphere in the furnace is 22%, the blank is conveyed to a die within 7s, the die assembly speed of an upper die and a lower die is 80mm/s, the pressure maintaining time is 5s, the pressure maintaining pressure is 15MPa, the proportion of martensite in the microstructure of the obtained hot stamping product substrate is higher than 95%, the hardness HV10 is 461, the total thickness of a coating is 42 mu m, and.
Example 7
Laser blanking a 1.8mm steel plate with an aluminum alloy coating into blanks with the size and the shape of , wherein the hot dip coating plating solution comprises 10% of Si, 3.5% of Fe and the balance of aluminum and inevitable impurities, the blanks enter a heating furnace, the temperature of the heating furnace is 945 ℃, the retention time is 2.5min, the oxygen content of the atmosphere in the furnace is 22%, the blanks are conveyed to a die within 7s, the die assembly speed of an upper die and a lower die is 80mm/s, the pressure maintaining time is 5s, the pressure maintaining pressure is 15MPa, the proportion of martensite in the microstructure of the obtained hot stamping product substrate is higher than 95%, the hardness HV10 is 470, the total thickness of the coating is 40 mu m, and the.
Example 8
Laser blanking a 2.0mm steel plate with an aluminum alloy coating into a blank with the size and the shape of , wherein the hot dip coating plating solution comprises 10% of Si, 3.5% of Fe and the balance of aluminum and inevitable impurities, the blank enters a heating furnace, the temperature of the heating furnace is 940 ℃, the residence time is 3min, the oxygen content of the atmosphere in the furnace is 22%, the blank is transmitted to a die within 7s, the die assembly speed of an upper die and a lower die is 80mm/s, the pressure maintaining time is 5s, and the pressure maintaining pressure is 15MPa, the martensite proportion in the microstructure of the obtained hot stamping product substrate is higher than 95%, the hardness HV10 is 480, the total thickness of the coating is 40 mu m, and the thickness of an alloy layer is 11 mu m, as shown in figure 7, the coating is the cross-section SEM appearance of the hot stamping product, and the coating outwards from a steel substrate 100 comprises the.
Example 9
Laser blanking a 2.4mm steel plate with an aluminum alloy coating into a blank with the size and the shape of , wherein the hot dip coating plating solution comprises 10% of Si, 3.5% of Fe and the balance of aluminum and inevitable impurities, the blank enters a heating furnace, the temperature of the heating furnace is 935 ℃, the retention time is 5min, the oxygen content of the atmosphere in the furnace is 22%, the blank is conveyed to a die within 7s, the die assembly speed of an upper die and a lower die is 80mm/s, the pressure maintaining time is 5s, the pressure maintaining pressure is 15MPa, the proportion of martensite in the microstructure of the obtained hot stamping product substrate is higher than 95%, the hardness HV10 is 460, the total thickness of the coating is 42 mu m, and.
Example 10
Laser blanking a 2.8mm steel plate with an aluminum alloy coating into blanks with the size and the shape of , wherein the hot dip coating plating solution comprises 10% of Si, 3.5% of Fe and the balance of aluminum and inevitable impurities, the blanks enter a heating furnace, the temperature of the heating furnace is 950 ℃, the residence time is 2.5min, the oxygen content of the atmosphere in the furnace is 20%, the blanks are conveyed to a die within 7s, the die assembly speed of an upper die and a lower die is 80mm/s, the pressure maintaining time is 5s, the pressure maintaining pressure is 15MPa, the proportion of martensite in the microstructure of the obtained hot stamping product substrate is higher than 95%, the hardness HV10 is 460, the total thickness of the coating is 40 mu m, and the.
As can be seen from figure 1, the aluminum-silicon plating layer coming materials with the same specification are subjected to the same hot stamping process, and the obtained hot stamping products are greatly different in appearance color, such as grayish blue, yellow, bluish purple and the like.
As can be seen from fig. 2, the prior hot-stamped products with the aluminum-silicon coating showed distinct color differences under the metallographic microscope.
As can be seen from fig. 3, the hot stamped product of example 1 of the present invention had a relatively uniform -like appearance color and a bluish gray color under the same hot stamping process.
As can be seen from FIGS. 4 and 5, the cross-sectional thickness of the coating of the hot stamped product in examples 1-2 of the present invention is uniform and continuous, and the thickness of the alloy layer and the coating meet the requirements.
TABLE 1 Steel plate composition weight percent (wt%)
Examples C Si Mn P S Al Ti B Cr
1 0.15 0.10 2.90 0.059 0.038 0.09 0.090 0.0031 0.15
2 0.25 0.23 1.19 0.015 0.001 0.04 0.030 0.0040 0.27
3 0.49 0.50 2.51 0.024 0.04 0.08 0.027 0.0052 0.51
4 0.39 0.36 3.00 0.044 0.03 0.07 0.05 0.0062 0.71
5 0.50 0.48 0.50 0.081 0.02 0.05 0.20 0.0071 0.20
6 0.15 0.10 2.90 0.059 0.038 0.09 0.090 0.0031 0.15
7 0.25 0.23 1.19 0.015 0.001 0.04 0.030 0.0040 0.27
8 0.49 0.50 2.51 0.024 0.04 0.08 0.027 0.0052 0.51
9 0.39 0.36 3.00 0.044 0.03 0.07 0.05 0.0062 0.71
10 0.50 0.48 0.50 0.081 0.02 0.05 0.20 0.0071 0.20
TABLE 2
Figure BDA0001077151960000101
TABLE 3
Figure BDA0001077151960000112

Claims (105)

1, A method for manufacturing a hot-stamped steel product with an aluminum or aluminum alloy coating, comprising the steps of:
1) blanking: processing the steel plate with the aluminum or aluminum alloy coating into a blank with a shape required by the part by adopting a blanking or laser cutting method; the thickness of the steel plate with the coating is not more than 2.8 mm; the steel plate with the coating comprises the following components in percentage by weight: c: 0.08-0.8%, Si: 0.05-1.0%, Mn: 0.1-5%, P < 0.3%, S < 0.1%, Al < 0.3%, Ti < 0.5%, B: 0.0005 to 0.1%, Cr: 0.01-3%, the balance being Fe and unavoidable impurities;
2) blank heat treatment: placing the blank into a heating furnace for heating and heat preservation, wherein the temperature of the heating furnace is 900-950 ℃, the atmosphere in the heating furnace is air or mixed gas consisting of air and inert gas, the oxygen content in the atmosphere is always more than 15%, and the total retention time of the blank in the heating furnace is 2.5-10 minutes;
3) blank conveying: rapidly conveying the heated blank into a die for stamping, wherein the conveying time is 4-12 seconds, and the temperature of the blank before stamping is guaranteed to be 680-750 ℃;
4) hot stamping of the blank: directly stamping the hot blank in a die to form, and cooling the die in the stamping process to ensure that the surface temperature of the die before stamping is lower than 100 ℃.
2. The method for manufacturing a hot-stamped product of steel with an aluminum or aluminum alloy coating as claimed in claim 1, wherein the coated steel sheet comprises the following components in percentage by weight: c: 0.1-0.6%, Si: 0.07 to 0.7%, Mn: 0.3-4%, P < 0.2%, S < 0.08%, Al < 0.2%, Ti < 0.4%, B: 0.0005 to 0.08%, Cr: 0.01-2%, and the balance of Fe and inevitable impurities.
3. The method for manufacturing a hot-stamped product of steel with an aluminum or aluminum alloy coating as claimed in claim 1, wherein the coated steel sheet comprises the following components in percentage by weight: c: 0.15-0.5%, Si: 0.1 to 0.5%, Mn: 0.5-3%, P < 0.1%, S < 0.05%, Al < 0.1%, Ti < 0.2%, B: 0.0005 to 0.08%, Cr: 0.01-1%, and the balance of Fe and inevitable impurities.
4. A method of manufacturing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 1, wherein the coating layer is aluminum alloy, and the hot-dip coating bath for coating the steel sheet comprises the following components in percentage by weight: si: 5-11%, Fe: 0-4%, the balance being aluminum and unavoidable impurities.
5. A method of manufacturing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 1, wherein the coating layer is aluminum alloy, and the hot-dip coating bath for coating the steel sheet comprises the following components in percentage by weight: si: 9-10%, Fe: 2-4%, the balance being aluminum and unavoidable impurities.
6. The method for producing a hot-stamped product of aluminum-or aluminum alloy-coated steel as claimed in claim 1, wherein the difference between the maximum value and the minimum value of the thickness of the coating layer measured at different positions in the width direction of the upper and lower surfaces of the coated steel sheet is not more than 5 μm.
7. The method for manufacturing a hot-stamped product made of steel with an aluminum or aluminum alloy coating according to claim 1, wherein the heating furnace temperature in the step 2) is 935 to 950 ℃.
8. The method for producing a hot-stamped product of aluminum-or aluminum alloy-coated steel as claimed in claim 1, wherein the heating furnace temperature in the step 2) is 945 to 950 ℃.
9. The method for producing a hot-stamped steel product with an aluminum or aluminum alloy coating as claimed in claim 1, 7 or 8, wherein the residence time in the heating furnace in the step 2) is 2.5 to 5 min.
10. The method for producing a hot-stamped steel product with an aluminum or aluminum alloy coating according to claim 1, wherein the temperature in the furnace is 900 to 950 ℃ and the residence time in the furnace is 2.5 to 10min when the thickness of the steel sheet with an aluminum or aluminum alloy coating is less than 1.5 mm.
11. The method for producing a hot-stamped steel product with an aluminum or aluminum alloy coating according to claim 1, wherein the temperature in the furnace is 900 to 930 ℃ and the residence time in the furnace is 3 to 10min when the thickness of the steel sheet with an aluminum or aluminum alloy coating is less than 1.5 mm.
12. The method for producing a hot-stamped product of aluminum-or aluminum alloy-coated steel as claimed in claim 1 or 7, wherein the heating furnace temperature is 935 to 950 ℃ and the residence time in the heating furnace is 2.5 to 5min when the thickness of the aluminum-or aluminum alloy-coated steel sheet is less than 1.5 mm.
13. The method for producing a hot-stamped product of aluminum-or aluminum alloy-coated steel as claimed in claim 1 or 8, wherein the heating furnace temperature is 945 to 950 ℃ and the residence time in the heating furnace is 2.5 to 5min when the thickness of said aluminum-or aluminum alloy-coated steel sheet is less than 1.5 mm.
14. The method for producing a hot-stamped steel product with an aluminum or aluminum alloy coating as claimed in claim 1, wherein the temperature of the heating furnace is 900 to 950 ℃ and the residence time in the heating furnace is 2.5 to 10min when the thickness of the steel sheet with an aluminum or aluminum alloy coating is 1.5 to 2.0 mm.
15. The method for producing a hot-stamped steel product with an aluminum or aluminum alloy coating according to claim 1, wherein the temperature in the heating furnace is 900 to 930 ℃ and the residence time in the heating furnace is 3 to 10 minutes when the thickness of the steel sheet with an aluminum or aluminum alloy coating is 1.5 to 2.0 mm.
16. The method for producing a hot-stamped product of aluminum-or aluminum alloy-coated steel as claimed in claim 1 or 7, wherein the temperature of the heating furnace is 935 to 950 ℃ and the residence time in the heating furnace is 2.5 to 6min when the thickness of the aluminum-or aluminum alloy-coated steel sheet is 1.5 to 2.0 mm.
17. The method for producing a hot-stamped product of aluminum-or aluminum alloy-coated steel as claimed in claim 1 or 8, wherein the temperature of the heating furnace is 945 to 950 ℃ and the residence time in the heating furnace is 2.5 to 5min when the thickness of the aluminum-or aluminum alloy-coated steel sheet is 1.5 to 2.0 mm.
18. The method for producing a hot-stamped steel product with an aluminum or aluminum alloy coating as claimed in claim 1, wherein the temperature of the heating furnace is 900 to 950 ℃ and the residence time in the heating furnace is 2.5 to 10min when the thickness of the steel sheet with an aluminum or aluminum alloy coating is 2.0 to 2.8 mm.
19. The method for producing a hot-stamped steel product with an aluminum or aluminum alloy coating as claimed in claim 1, wherein the temperature of the heating furnace is 900 to 930 ℃ and the residence time in the heating furnace is 3.5 to 10min when the thickness of the steel sheet with an aluminum or aluminum alloy coating is 2.0 to 2.8 mm.
20. The method for producing a hot-stamped product of aluminum-or aluminum alloy-coated steel as claimed in claim 1 or 7, wherein the temperature of the heating furnace is 935 to 950 ℃ and the residence time in the heating furnace is 2.5 to 6min when the thickness of the aluminum-or aluminum alloy-coated steel sheet is 2.0 to 2.8 mm.
21. The method for producing a hot-stamped product of aluminum-or aluminum alloy-coated steel as claimed in claim 1 or 8, wherein the temperature of the heating furnace is 945 to 950 ℃ and the residence time in the heating furnace is 2.5 to 5min when the thickness of the aluminum-or aluminum alloy-coated steel sheet is 2.0 to 2.8 mm.
22. The method for manufacturing a hot-stamped product made of steel with a coating of aluminum or aluminum alloy according to claim 1, wherein the blank in the step 2) is heated at a temperature of 700 ℃ or higher by induction heating.
23. The method for producing a hot-stamped product of steel with a plated layer of aluminum or aluminum alloy as claimed in claim 1, wherein in the step 4), the die clamping speed during stamping is 30 to 150 mm/s.
24. The method for producing a hot-stamped product of steel with an aluminum or aluminum alloy coating according to claim 1, wherein in the step 4), the die clamping speed during stamping is 50 to 100 mm/s.
25. The method for manufacturing a hot-stamped steel product with an aluminum or aluminum alloy coating according to claim 1, 23 or 24, wherein in the step 4), the die is closed and then continuously quenched for 4-20 s under pressure during stamping, and the pressure applied to the part is higher than 8MPa on the surface of the part on average.
26. The method for manufacturing a hot-stamped product made of steel coated with aluminum or aluminum alloy according to claim 1, 23 or 24, wherein in the step 4), the die steel used for the die is made of: a thermal diffusivity of greater than 3.8m at 700 DEG C2/s。
27. The method for manufacturing a hot-stamped product made of steel coated with aluminum or aluminum alloy according to claim 25, wherein in the step 4), the die steel used for the die is made of: a thermal diffusivity of greater than 3.8m at 700 DEG C2/s。
28. The method for manufacturing a hot-stamped steel product with an aluminum or aluminum alloy coating as claimed in claim 1, 23 or 24, wherein in the step 4), a cooling system is arranged inside the die or a natural cooling mode is adopted for cooling the die in the stamping process.
29. The method for manufacturing a hot-stamped steel product with an aluminum or aluminum alloy coating as claimed in claim 25, wherein in the step 4), a cooling system is arranged inside the die or a natural cooling mode is adopted for cooling the die in the stamping process.
30. The method for manufacturing a hot-stamped product made of steel and coated with aluminum or aluminum alloy as claimed in claim 26, wherein in the step 4), a cooling system is arranged inside the die or a natural cooling mode is adopted for cooling the die in the stamping process.
31. The method for manufacturing a hot-stamped steel product with an aluminum or aluminum alloy coating as claimed in claim 27, wherein in the step 4), a cooling system is arranged inside the die or a natural cooling mode is adopted for cooling the die in the stamping process.
32. A method of manufacturing a hot-stamped product made of steel coated with aluminum or aluminum alloy as claimed in claim 1, 23 or 24, wherein in step 4), the stamped and formed part is cooled to a temperature of 300 ℃ or lower.
33. The method for producing a hot-stamped product made of steel and coated with aluminum or aluminum alloy as claimed in claim 25, wherein in the step 4), the part after the stamping is cooled to 300 ℃ or lower.
34. The method for producing a hot-stamped product made of steel coated with aluminum or aluminum alloy as claimed in claim 26, wherein in the step 4), the part after stamping is cooled to 300 ℃ or lower.
35. The method for producing a hot-stamped product made of steel and coated with aluminum or aluminum alloy as claimed in claim 27, wherein in the step 4), the part after the stamping is cooled to 300 ℃ or lower.
36. The method of manufacturing a hot-stamped product made of steel coated with aluminum or aluminum alloy as claimed in claim 28, wherein in step 4), the stamped and formed part is cooled to a temperature of 300 ℃ or lower.
37. The method of manufacturing a hot-stamped product made of steel coated with aluminum or aluminum alloy as claimed in claim 29, wherein in step 4), the stamped and formed part is cooled to a temperature of 300 ℃ or lower.
38. The method of manufacturing a hot-stamped product made of steel with a plated layer of aluminum or aluminum alloy as claimed in claim 30, wherein in step 4), the stamped and formed part is cooled to a temperature of 300 ℃ or less.
39. The method of manufacturing a hot-stamped product made of steel with a plated layer of aluminum or aluminum alloy as claimed in claim 31, wherein in step 4), the stamped and formed part is cooled to a temperature of 300 ℃ or less.
40. The method for manufacturing a hot-stamped product made of steel coated with aluminum or aluminum alloy according to claim 1, 23 or 24, wherein in the step 4), the microstructure of the steel sheet after stamping is 95% or more of martensite, and the tensile strength is more than 1300 MPa.
41. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 25, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
42. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 26, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
43. The method for producing a hot-stamped steel product coated with aluminum or an aluminum alloy as claimed in claim 27, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
44. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 28, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
45. The method of manufacturing a hot-stamped steel product with a plated aluminum or aluminum alloy layer as claimed in claim 29, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
46. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 30, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
47. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 31, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
48. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 32, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
49. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 33, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
50. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 34, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
51. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 35, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
52. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 36, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
53. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 37, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
54. The method for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 38, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
55. The method of manufacturing a hot-stamped steel product with a plated aluminum or aluminum alloy layer as claimed in claim 39, wherein in the step 4), the microstructure of the stamped steel sheet is 95% or more of martensite structure, and the tensile strength is more than 1300 MPa.
56. The method for manufacturing a hot-stamped product made of steel coated with aluminum or aluminum alloy according to claim 1, 23 or 24, wherein the coating after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating is not more than 50 μm.
57. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 25, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
58. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 26, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
59. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 27, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
60. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 28, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
61. The method for manufacturing a hot-stamped product made of steel with a plated layer of aluminum or aluminum alloy according to claim 29, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
62. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 30, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
63. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 31, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
64. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 32, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
65. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 33, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
66. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 34, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
67. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 35, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
68. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 36, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
69. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 37, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
70. The method for manufacturing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 38, wherein the coating layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating layer is not more than 50 μm.
71. The process for producing a hot-stamped steel product coated with aluminum or an aluminum alloy as claimed in claim 39, wherein in the step 4), the coating layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating layer is not more than 50 μm.
72. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 40, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
73. The process for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 41, wherein in the step 4), the coating layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating layer is not more than 50 μm.
74. The process for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 42, wherein in the step 4), the coating layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating layer is not more than 50 μm.
75. The process for producing a hot-stamped steel product coated with aluminum or an aluminum alloy as claimed in claim 43, wherein the coating layer after stamping in step 4) comprises an alloy layer and a surface layer, the alloy layer has a thickness of not more than 16 μm, and the total coating layer thickness is not more than 50 μm.
76. The process for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 44, wherein in the step 4), the coating layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating layer is not more than 50 μm.
77. The process for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 45, wherein in the step 4), the coating layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating layer is not more than 50 μm.
78. The process for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 46, wherein in the step 4), the coating layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating layer is not more than 50 μm.
79. The process for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 47, wherein in the step 4), the coating layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating layer is not more than 50 μm.
80. The process for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 48, wherein in the step 4), the coating layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating layer is not more than 50 μm.
81. The process for producing a hot-stamped steel product coated with aluminum or an aluminum alloy as claimed in claim 49, wherein the coating layer after stamping in step 4) comprises an alloy layer and a surface layer, the alloy layer has a thickness of not more than 16 μm, and the total coating layer thickness is not more than 50 μm.
82. The method for manufacturing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 50, wherein the plated layer after stamping in step 4) comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
83. The process for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 51, wherein in the step 4), the coating layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating layer is not more than 50 μm.
84. The process for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 52, wherein the coating layer after stamping in step 4) comprises an alloy layer and a surface layer, the alloy layer has a thickness of not more than 16 μm, and the total coating layer thickness is not more than 50 μm.
85. The process for producing a hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 53, wherein in the step 4), the plated layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the plated layer is not more than 50 μm.
86. The process for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 54, wherein the coating layer after stamping in step 4) comprises an alloy layer and a surface layer, the alloy layer has a thickness of not more than 16 μm, and the total coating layer thickness is not more than 50 μm.
87. The process for producing a hot-stamped steel product coated with aluminum or aluminum alloy as claimed in claim 55, wherein in step 4), the coating layer after stamping comprises an alloy layer and a surface layer, the thickness of the alloy layer is not more than 16 μm, and the total thickness of the coating layer is not more than 50 μm.
88. The hot-stamped steel product obtained by the method for producing a hot-stamped steel product coated with aluminum or aluminum alloy according to claim 1, which is a coated steel sheet having a surface coated with an aluminum or aluminum alloy coating layer, wherein the steel sheet comprises the following components in percentage by weight: c: 0.08-0.8%, Si: 0.05-1.0%, Mn: 0.1-5%, P < 0.3%, S < 0.1%, Al < 0.3%, Ti < 0.5%, B: 0.0005 to 0.1%, Cr: 0.01-3%, and the balance of Fe and inevitable impurities.
89. The aluminum or aluminum alloy coated steel hot stamped product of claim 88 wherein the coated steel sheet comprises the following composition by weight percent: c: 0.1-0.6%, Si: 0.07 to 0.7%, Mn: 0.3-4%, P < 0.2%, S < 0.08%, Al < 0.2%, Ti < 0.4%, B: 0.0005 to 0.08%, Cr: 0.01-2%, and the balance of Fe and inevitable impurities.
90. The aluminum or aluminum alloy coated steel hot stamped product of claim 88 wherein the coated steel sheet comprises the following composition by weight percent: c: 0.15-0.5%, Si: 0.1 to 0.5%, Mn: 0.5-3%, P < 0.1%, S < 0.05%, Al < 0.1%, Ti: < 0.2%, B: 0.0005 to 0.08%, Cr: 0.01-1%, and the balance of Fe and inevitable impurities.
91. A hot-stamped steel product according to claim 88, 89 or 90 coated with an aluminium or aluminium alloy, wherein the coating comprises an alloy layer and a surface layer, the alloy layer having a thickness not exceeding 16 μm and the coating having a total thickness not exceeding 50 μm.
92. The aluminum or aluminum alloy coated steel hot stamped product of claim 88, 89 or 90 wherein the coating is an aluminum alloy coating comprising, from the steel substrate outward, an alloy layer, an Al-rich intermetallic layer, an intermediate layer, and a surface layer, the alloy layer comprising the following major constituents in weight percent: si: 0-6%, Fe: 75-96%, Al: 2 to 12 percent; the Al-rich intermetallic compound layer comprises the following main components in percentage by weight: si: 0-2%, Fe: 30-50%, Al: 40-60 percent; the weight percentage of the main components of the middle layer is as follows: si: 2-6%, Fe: 50-65%, Al: 20 to 35 percent; the main components of the surface layer are as follows by weight percent: si: 2-6%, Fe: 50-65%, Al: 20 to 35 percent.
93. The aluminum or aluminum alloy coated steel hot stamped product of claim 91 wherein the coating is an aluminum alloy coating comprising, from the steel substrate outward, an alloy layer, an Al rich intermetallic layer, an intermediate layer, and a surface layer, the alloy layer comprising the following major constituents in weight percent: si: 0-6%, Fe: 75-96%, Al: 2 to 12 percent; the Al-rich intermetallic compound layer comprises the following main components in percentage by weight: si: 0-2%, Fe: 30-50%, Al: 40-60 percent; the weight percentage of the main components of the middle layer is as follows: si: 2-6%, Fe: 50-65%, Al: 20 to 35 percent; the main components of the surface layer are as follows by weight percent: si: 2-6%, Fe: 50-65%, Al: 20 to 35 percent.
94. The hot-stamped product made of steel and coated with aluminum or an aluminum alloy as claimed in claim 88, 89 or 90, wherein the difference between the maximum value and the minimum value of the coating thickness measured at different positions in the width direction of the upper and lower surfaces of the coated steel sheet is not more than 5 μm.
95. The hot-stamped steel product with a plated layer of aluminum or aluminum alloy as claimed in claim 91, wherein the difference between the maximum value and the minimum value of the thickness of the plated layer measured at different positions in the width direction of the upper and lower surfaces of the plated steel sheet is not more than 5 μm.
96. The hot-stamped steel product formed with a plated layer of aluminum or aluminum alloy as claimed in claim 92, wherein the difference between the maximum value and the minimum value of the thickness of the plated layer measured at different positions in the width direction of the upper and lower surfaces of the plated steel sheet is not more than 5 μm.
97. The hot-stamped steel product formed with a plated layer of aluminum or aluminum alloy as claimed in claim 93, wherein the difference between the maximum value and the minimum value of the thickness of the plated layer measured at different positions in the width direction of the upper and lower surfaces of the plated steel sheet is not more than 5 μm.
98. The aluminum or aluminum alloy coated steel hot stamped product of claim 88, 89 or 90 wherein the microstructure of the steel sheet is greater than 95% martensite with a tensile strength greater than 1300 MPa.
99. The hot-stamped steel product formed with an aluminum or aluminum alloy coating as claimed in claim 91, wherein the microstructure of said steel sheet is 95% or more martensite, and the tensile strength is greater than 1300 MPa.
100. The hot-stamped steel product made with an aluminum or aluminum alloy coating as claimed in claim 92, wherein the microstructure of said steel sheet is 95% or more martensite and the tensile strength is more than 1300 MPa.
101. The hot-stamped steel product made with an aluminum or aluminum alloy coating as claimed in claim 93, wherein the microstructure of said steel sheet is 95% or more martensite, and the tensile strength is more than 1300 MPa.
102. The hot stamped steel product formed with an aluminum or aluminum alloy coating as claimed in claim 94, wherein the microstructure of said steel sheet is greater than 95% martensite and the tensile strength is greater than 1300 MPa.
103. The hot-stamped steel product made with an aluminum or aluminum alloy coating as claimed in claim 95, wherein the microstructure of said steel sheet is 95% or more martensite and the tensile strength is 1300MPa or more.
104. The hot-stamped steel product made with an aluminum or aluminum alloy coating as claimed in claim 96, wherein the microstructure of said steel sheet is 95% or more martensite and the tensile strength is more than 1300 MPa.
105. The hot-stamped steel product with an aluminum or aluminum alloy coating as claimed in claim 97, wherein the microstructure of said steel sheet is a martensite structure of 95% or more, and the tensile strength is greater than 1300 MPa.
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