CN109628846B - 1300 MPa-grade ultrahigh-strength cold-rolled steel plate for automobiles and production method thereof - Google Patents
1300 MPa-grade ultrahigh-strength cold-rolled steel plate for automobiles and production method thereof Download PDFInfo
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- 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
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- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing 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
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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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Abstract
The invention discloses a 1300 MPa-grade ultrahigh-strength cold-rolled steel plate for automobiles and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: c: 0.2-0.3%, Mn: 1.3-2.0%, S is less than or equal to 0.005%, P is less than or equal to 0.02%, Si: 0.2-0.3%, Als is less than or equal to 0.08%, Nb: 0.01-0.03%, Ti: 0.04-0.08%, B: 0.001-0.004%, Mo: 0.2-0.3%, Cr: 0.05-0.10%, V: 0.01-0.02% of Fe and other inevitable impurities as the rest; the production method comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling and straightening. The cold-rolled steel plate has excellent mechanical properties, the yield strength is more than or equal to 850MPa, the tensile strength is more than or equal to 1300MPa, the elongation is more than or equal to 7 percent, and the cold-forming property is good.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a 1300 MPa-grade ultrahigh-strength cold-rolled steel plate for automobiles and a production method thereof.
Background
In recent years, in order to meet the requirements of weight reduction, energy saving, environmental protection and safety of automobiles, the development and research of high-strength automobile steel have been one of the key subjects in the field of steel material research. Compared with the second generation and third generation advanced high-strength automobile steel, the dual-phase steel is a typical representative of the first generation advanced high-strength automobile steel due to the characteristics of low production cost, low yield ratio, high elongation, obvious work hardening, easiness in stamping, good plasticity, good toughness matching and the like, and occupies the greatest proportion in the automobile high-strength steel.
The microstructure of the dual-phase steel automobile plate product consists of ferrite and martensite, the martensite structure is dispersed and distributed on a ferrite matrix in an island shape, and the strength and the proportion of the martensite phase determine the strength grade of the dual-phase steel. At present, the research on high-strength dual-phase steel is mostly focused on the DP1180 strength level and below, and with the progress of the steel industry and the automobile body manufacturing technology, advanced high-strength steel with the strength of 1300MPa or above is increasingly applied to the automobile body manufacturing.
Disclosure of Invention
The invention aims to solve the technical problem of providing a 1300 MPa-grade ultrahigh-strength cold-rolled steel plate for automobiles and a production method thereof. The steel plate produced by the invention has good plasticity and toughness matching, good forming performance, low manufacturing cost, simple process and high performance stability, and can bring considerable economic benefit.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the 1300 MPa-grade ultrahigh-strength cold-rolled steel plate for the automobile comprises the following chemical components in percentage by mass: c: 0.2-0.3%, Mn: 1.3-2.0%, S is less than or equal to 0.005%, P is less than or equal to 0.02%, Si: 0.2-0.3%, Als is less than or equal to 0.08%, Nb: 0.01-0.03%, Ti: 0.04-0.08%, B: 0.001-0.004%, Mo: 0.2-0.3%, Cr: 0.05-0.10%, V: 0.01-0.02%, and the balance of Fe and other inevitable impurities.
The thickness of the steel plate is 0.8-2.0 mm; the microstructure consists of ferrite and martensite, and the martensite is dispersed and distributed on the ferrite matrix in an island shape.
The yield strength of the steel plate is more than or equal to 850MPa, the tensile strength is more than or equal to 1300MPa, and the elongation A80 is more than or equal to 7%.
The invention also provides a production method of the 1300 MPa-grade ultrahigh-strength cold-rolled steel plate for the automobile, which comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling and straightening; in the hot rolling process, the heating temperature of a plate blank is more than or equal to 1200 ℃, the rough rolling is carried out for 3-7 times, the thickness of an intermediate blank after the rough rolling is 28-40 mm, the inlet temperature of the finish rolling is 1020-1100 ℃, the final rolling temperature is 820-900 ℃, and the coiling temperature is 550-650 ℃.
The steelmaking process comprises molten iron desulphurization and slagging, converter smelting, L F furnace refining and RH vacuum treatment.
According to the continuous casting process, the surface and internal quality of the slab is controlled in the casting process, and microcracks and secondary cracks on the surface of the slab are prevented.
In the acid rolling process, cold rolling is carried out after acid pickling, and the cold rolling reduction rate is more than or equal to 45 percent.
In the continuous annealing process, the heat preservation temperature of the soaking section is 760-840 ℃, and the heat preservation time is 60-225 s; the heat preservation temperature of the overaging section is 250-320 ℃, and the heat preservation time of the overaging section is 300-1225 s.
The leveling, pulling and straightening process has the leveling elongation of 0.1-0.4%.
The invention relates to a 1300MPa grade ultrahigh strength cold-rolled steel sheet for automobiles, which is subject to GB/T228.1-2010 standard reference.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the invention adopts C, Mn and Mo elements to improve the hardenability of steel and ensure the strength of strip steel; meanwhile, Nb, V and Ti are adopted for micro-alloying, and the yield strength and toughness are improved by utilizing the fine grain strengthening effect; the ultra-high strength steel has the advantages that the ultra-high strength steel can be realized, the better elongation is kept, the reduction of the elongation caused by too much Nb element is avoided, and the ultra-high strength steel has the characteristics of excellent comprehensive performance, low cost and the like. 2. The method of the invention controls the processes of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling and straightening and withdrawal, produces the automobile ultrahigh strength cold rolled steel plate with good plasticity and toughness matching, and has the characteristics of low cost, stable production process, excellent and stable finished product performance. 3. The ultrahigh-strength cold-rolled steel sheet for the automobile, which is obtained by the method, has excellent mechanical properties, the yield strength of more than or equal to 850MPa, the tensile strength of more than or equal to 1300MPa and the elongation of more than or equal to 7 percent, and has good cold-forming property.
Drawings
FIG. 1 is a metallographic structure diagram of an ultra-high strength cold rolled steel sheet for an automobile according to example 1;
FIG. 2 is a drawing graph of an ultra-high strength cold rolled steel sheet for automobiles according to example 1.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Example 1
The thickness of the 1300MPa grade ultrahigh strength cold rolled steel plate for automobiles in the embodiment is 0.8mm, and the chemical composition and the mass percentage content thereof are shown in Table 1.
The production method of the 1300 MPa-grade ultrahigh-strength cold-rolled steel sheet for the automobile comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling, pulling and straightening, and comprises the following specific processing steps:
(1) the steel making process comprises molten iron desulphurization and slagging off, converter smelting, L F furnace refining and RH vacuum treatment;
(2) and (3) continuous casting process: controlling the surface and internal quality of the slab in the casting process;
(3) a hot rolling procedure: the heating temperature of the plate blank is 1250 ℃; rough rolling for 5 times, wherein the thickness of the intermediate blank after rough rolling is 34 mm; the inlet temperature of finish rolling is 1050 ℃, the finish rolling temperature is 820 ℃ and the coiling temperature is 580 ℃;
(4) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 45%;
(5) a continuous annealing process: the heat preservation temperature of the soaking section is 820 ℃, and the heat preservation time is 100 s; the heat preservation temperature of the overaging section is 250 ℃, and the heat preservation time of the overaging section is 1000 s;
(6) leveling, pulling and straightening: the flat elongation was 0.20%.
The performance indexes of the 1300MPa grade ultrahigh-strength cold-rolled steel sheet for automobiles in the embodiment are shown in Table 2; the microstructure consists of ferrite and martensite, and the martensite is dispersed and distributed on the ferrite matrix in an island shape.
The metallographic structure of the 1300MPa grade ultrahigh strength cold-rolled steel sheet for automobiles obtained in the embodiment is shown in figure 1; the tensile curve of the ultra-high strength cold rolled steel sheet is shown in FIG. 2. (the metallographic structure of the ultra-high strength cold rolled steel sheet for automobiles of examples 2 to 8 is similar to that of FIG. 1 and thus omitted; the tensile strength of the ultra-high strength cold rolled steel sheet for automobiles of examples 2 to 8 is similar to that of FIG. 2 and thus omitted.)
Example 2
The thickness of the 1300MPa grade ultrahigh strength cold rolled steel plate for automobiles in the embodiment is 1.0mm, and the chemical component composition and the mass percentage content are shown in Table 1.
The production method of the 1300 MPa-grade ultrahigh-strength cold-rolled steel sheet for the automobile comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling, pulling and straightening, and comprises the following specific processing steps:
(1) the steel making process comprises molten iron desulphurization and slagging off, converter smelting, L F furnace refining and RH vacuum treatment;
(2) and (3) continuous casting process: controlling the surface and internal quality of the slab in the casting process;
(3) a hot rolling procedure: the heating temperature of the plate blank is 1220 ℃; rough rolling for 5 times, wherein the thickness of the intermediate blank after rough rolling is 38 mm; the inlet temperature of finish rolling is 1060 ℃, the finish rolling temperature is 835 ℃, and the coiling temperature is 550 ℃;
(4) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 55 percent;
(5) a continuous annealing process: the heat preservation temperature of the soaking section is 760 ℃, and the heat preservation time is 225 s; the heat preservation temperature of the overaging section is 295 ℃, and the heat preservation time of the overaging section is 300 s;
(6) leveling, pulling and straightening: the flat elongation was 0.40%.
The performance indexes of the 1300MPa grade ultrahigh-strength cold-rolled steel sheet for automobiles in the embodiment are shown in Table 2; the microstructure consists of ferrite and martensite, and the martensite is dispersed and distributed on the ferrite matrix in an island shape.
Example 3
The thickness of the 1300MPa grade ultrahigh strength cold rolled steel plate for automobiles in the embodiment is 2.0mm, and the chemical component composition and the mass percentage content are shown in Table 1.
The production method of the 1300 MPa-grade ultrahigh-strength cold-rolled steel sheet for the automobile comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling, pulling and straightening, and comprises the following specific processing steps:
(1) the steel making process comprises molten iron desulphurization and slagging off, converter smelting, L F furnace refining and RH vacuum treatment;
(2) and (3) continuous casting process: controlling the surface and internal quality of the slab in the casting process;
(3) a hot rolling procedure: the heating temperature of the plate blank is 1200 ℃; rough rolling for 3 times, wherein the thickness of the intermediate blank after rough rolling is 40 mm; the inlet temperature of finish rolling is 1100 ℃, the finish rolling temperature is 900 ℃, and the coiling temperature is 620 ℃;
(4) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 45%;
(5) a continuous annealing process: the heat preservation temperature of the soaking section is 800 ℃, and the heat preservation time is 150 s; the heat preservation temperature of the overaging section is 280 ℃, and the heat preservation time of the overaging section is 600 s;
(6) leveling, pulling and straightening: the flat elongation was 0.20%.
The performance indexes of the 1300MPa grade ultrahigh-strength cold-rolled steel sheet for automobiles in the embodiment are shown in Table 2; the microstructure consists of ferrite and martensite, and the martensite is dispersed and distributed on the ferrite matrix in an island shape.
Example 4
The thickness of the 1300MPa grade ultrahigh strength cold rolled steel plate for automobiles in the embodiment is 1.5mm, and the chemical component composition and the mass percentage content are shown in Table 1.
The production method of the 1300 MPa-grade ultrahigh-strength cold-rolled steel sheet for the automobile comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling, pulling and straightening, and comprises the following specific processing steps:
(1) the steel making process comprises molten iron desulphurization and slagging off, converter smelting, L F furnace refining and RH vacuum treatment;
(2) and (3) continuous casting process: controlling the surface and internal quality of the slab in the casting process;
(3) a hot rolling procedure: the heating temperature of the plate blank is 1245 ℃; rough rolling for 5 times, wherein the thickness of the intermediate blank after rough rolling is 34 mm; the inlet temperature of finish rolling is 1040 ℃, the finish rolling temperature is 845 ℃, and the coiling temperature is 650 ℃;
(4) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 50%;
(5) a continuous annealing process: the heat preservation temperature of the soaking section is 780 ℃ and the heat preservation time is 180 s; the heat preservation temperature of the overaging section is 270 ℃, and the heat preservation time of the overaging section is 500 s;
(6) leveling, pulling and straightening: the flat elongation was 0.15%.
The performance indexes of the 1300MPa grade ultrahigh-strength cold-rolled steel sheet for automobiles in the embodiment are shown in Table 2; the microstructure consists of ferrite and martensite, and the martensite is dispersed and distributed on the ferrite matrix in an island shape.
Example 5
The thickness of the 1300MPa grade ultrahigh strength cold rolled steel plate for automobiles in the embodiment is 1.2mm, and the chemical component composition and the mass percentage content are shown in Table 1.
The production method of the 1300 MPa-grade ultrahigh-strength cold-rolled steel sheet for the automobile comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling, pulling and straightening, and comprises the following specific processing steps:
(1) the steel making process comprises molten iron desulphurization and slagging off, converter smelting, L F furnace refining and RH vacuum treatment;
(2) and (3) continuous casting process: controlling the surface and internal quality of the slab in the casting process;
(3) a hot rolling procedure: the heating temperature of the plate blank is 1265 ℃; rough rolling for 5 times, wherein the thickness of the intermediate blank after rough rolling is 32 mm; the inlet temperature of finish rolling is 1055 ℃, the finish rolling temperature is 880 ℃, and the coiling temperature is 600 ℃;
(4) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 60 percent;
(5) a continuous annealing process: the heat preservation temperature of the soaking section is 840 ℃, and the heat preservation time is 60 s; the heat preservation temperature of the overaging section is 320 ℃, and the heat preservation time of the overaging section is 900 s;
(6) leveling, pulling and straightening: the flat elongation was 0.40%.
The performance indexes of the 1300MPa grade ultrahigh-strength cold-rolled steel sheet for automobiles in the embodiment are shown in Table 2; the microstructure consists of ferrite and martensite, and the martensite is dispersed and distributed on the ferrite matrix in an island shape.
Example 6
The thickness of the 1300MPa grade ultrahigh strength cold rolled steel plate for automobiles in the embodiment is 1.3mm, and the chemical component composition and the mass percentage content are shown in Table 1.
The production method of the 1300 MPa-grade ultrahigh-strength cold-rolled steel sheet for the automobile comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling, pulling and straightening, and comprises the following specific processing steps:
(1) the steel making process comprises molten iron desulphurization and slagging off, converter smelting, L F furnace refining and RH vacuum treatment;
(2) and (3) continuous casting process: controlling the surface and internal quality of the slab in the casting process;
(3) a hot rolling procedure: the heating temperature of the plate blank is 1290 ℃; carrying out rough rolling for 7 times, wherein the thickness of the intermediate blank after rough rolling is 28 mm; the inlet temperature of finish rolling is 1020 ℃, the finish rolling temperature is 840 ℃, and the coiling temperature is 560 ℃;
(4) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 65 percent;
(5) a continuous annealing process: the heat preservation temperature of the soaking section is 790 ℃, and the heat preservation time is 170 s; the heat preservation temperature of the overaging section is 300 ℃, and the heat preservation time of the overaging section is 1225 s;
(6) leveling, pulling and straightening: the flat elongation was 0.25%.
The performance indexes of the 1300MPa grade ultrahigh-strength cold-rolled steel sheet for automobiles in the embodiment are shown in Table 2; the microstructure consists of ferrite and martensite, and the martensite is dispersed and distributed on the ferrite matrix in an island shape.
Example 7
The thickness of the 1300MPa grade ultrahigh strength cold rolled steel plate for automobiles in the embodiment is 1.8mm, and the chemical component composition and the mass percentage content are shown in Table 1.
The production method of the 1300 MPa-grade ultrahigh-strength cold-rolled steel sheet for the automobile comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling, pulling and straightening, and comprises the following specific processing steps:
(1) the steel making process comprises molten iron desulphurization and slagging off, converter smelting, L F furnace refining and RH vacuum treatment;
(2) and (3) continuous casting process: controlling the surface and internal quality of the slab in the casting process;
(3) a hot rolling procedure: the heating temperature of the plate blank is 1237 ℃; rough rolling for 3 times, wherein the thickness of the intermediate blank after rough rolling is 30 mm; the inlet temperature of finish rolling is 1072 ℃, the finish rolling temperature is 868 ℃, and the coiling temperature is 635 ℃;
(4) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 48 percent;
(5) a continuous annealing process: the heat preservation temperature of the soaking section is 772 ℃, and the heat preservation time is 85 s; the heat preservation temperature of the overaging section is 261 ℃, and the heat preservation time of the overaging section is 724 s;
(6) leveling, pulling and straightening: the flat elongation was 0.10%.
The performance indexes of the 1300MPa grade ultrahigh-strength cold-rolled steel sheet for automobiles in the embodiment are shown in Table 2; the microstructure consists of ferrite and martensite, and the martensite is dispersed and distributed on the ferrite matrix in an island shape.
Example 8
The thickness of the 1300MPa grade ultrahigh strength cold rolled steel plate for automobiles in the embodiment is 1.4mm, and the chemical component composition and the mass percentage content are shown in Table 1.
The production method of the 1300 MPa-grade ultrahigh-strength cold-rolled steel sheet for the automobile comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling, pulling and straightening, and comprises the following specific processing steps:
(1) the steel making process comprises molten iron desulphurization and slagging off, converter smelting, L F furnace refining and RH vacuum treatment;
(2) and (3) continuous casting process: controlling the surface and internal quality of the slab in the casting process;
(3) a hot rolling procedure: the heating temperature of the plate blank is 1278 ℃; carrying out rough rolling for 7 times, wherein the thickness of the intermediate blank after rough rolling is 36 mm; the inlet temperature of finish rolling is 1086 ℃, the finish rolling temperature is 859 ℃, and the coiling temperature is 572 ℃;
(4) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 57%;
(5) a continuous annealing process: the heat preservation temperature of the soaking section is 815 ℃, and the heat preservation time is 125 s; the heat preservation temperature of the overaging section is 312 ℃, and the heat preservation time of the overaging section is 1138 s;
(6) leveling, pulling and straightening: the flat elongation was 0.32%.
The performance indexes of the 1300MPa grade ultrahigh-strength cold-rolled steel sheet for automobiles in the embodiment are shown in Table 2; the microstructure consists of ferrite and martensite, and the martensite is dispersed and distributed on the ferrite matrix in an island shape.
TABLE 1 chemical composition of ultra high strength cold rolled steel sheet for automobile and examples 1 to 8
Mass percentage content (%)
The balance of the ingredients in table 1 is Fe and other unavoidable impurities.
TABLE 2 Performance index of ultra-high strength cold rolled steel sheet for automobiles of examples 1 to 8
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (5)
1. The 1300 MPa-grade ultrahigh-strength cold-rolled steel plate for the automobile is characterized by comprising the following chemical components in percentage by mass: c: 0.21 to 0.3%, Mn: 1.3-2.0%, S is less than or equal to 0.005%, P is less than or equal to 0.02%, Si: 0.2-0.3%, Als is less than or equal to 0.08%, Nb: 0.01-0.03%, Ti: 0.04-0.08%, B: 0.001-0.004%, Mo: 0.22-0.3%, Cr: 0.05-0.10%, V: 0.01-0.02% of Fe and other inevitable impurities as the balance, wherein the yield strength of the steel plate is more than or equal to 850MPa, the tensile strength is more than or equal to 1300MPa, and the elongation A80 is more than or equal to 7%; the ultra-high strength cold rolled steel sheet is produced by the following method: comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling and straightening; in the hot rolling process, the heating temperature of a plate blank is more than or equal to 1200 ℃, the rough rolling is carried out for 3-7 times, the thickness of an intermediate blank after the rough rolling is 28-40 mm, the inlet temperature of the finish rolling is 1020-1100 ℃, the final rolling temperature is 820-900 ℃, and the coiling temperature is 550-650 ℃; in the continuous annealing process, the heat preservation temperature of the soaking section is 760-840 ℃, and the heat preservation time is 60-225 s; the heat preservation temperature of the overaging section is 250-320 ℃, and the heat preservation time of the overaging section is 300-1225 s.
2. The ultra-high strength cold rolled steel sheet for 1300MPa grade automobile according to claim 1, wherein the thickness of the steel sheet is 0.8-2.0 mm, and the microstructure is composed of ferrite and martensite.
3. The production method of the ultra-high strength cold rolled steel sheet for 1300MPa automobile according to claim 1 or 2, wherein the production method comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, continuous annealing and leveling and straightening; in the hot rolling process, the heating temperature of a plate blank is more than or equal to 1200 ℃, the rough rolling is carried out for 3-7 times, the thickness of an intermediate blank after the rough rolling is 28-40 mm, the inlet temperature of the finish rolling is 1020-1100 ℃, the final rolling temperature is 820-900 ℃, and the coiling temperature is 550-650 ℃; in the continuous annealing process, the heat preservation temperature of the soaking section is 760-840 ℃, and the heat preservation time is 60-225 s; the heat preservation temperature of the overaging section is 250-320 ℃, and the heat preservation time of the overaging section is 300-1225 s.
4. The method for producing the ultra-high strength cold rolled steel sheet for 1300MPa automobile according to claim 3, wherein the acid rolling step is performed after acid pickling, and the cold rolling reduction is not less than 45%.
5. The method for producing the ultra-high strength cold rolled steel sheet for 1300MPa automotive vehicle as claimed in claim 3 or 4, wherein the flattening and straightening process has a flattening elongation of 0.1-0.4%.
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