CN109852887B - Ultrahigh-strength-ductility cold-rolled steel plate and production method thereof - Google Patents
Ultrahigh-strength-ductility cold-rolled steel plate and production method thereof Download PDFInfo
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Abstract
The invention discloses an ultrahigh-strength-ductility cold-rolled steel plate and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: c: 0.20 to 0.23%, Si: 1.20-1.40%, Mn: 1.90-2.10%, P is less than or equal to 0.020%, S is less than or equal to 0.008%, Als: 0.50-0.70%, Nb: 0.025 to 0.040%, Ti: 0.020-0.030 percent of N, less than or equal to 0.0050 percent of N, and the balance of iron and inevitable impurities; the production method comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling. The invention adopts medium carbon, high silicon, high manganese, Nb and Ti microalloying in the component design, obtains the ultra-high strength and ductility cold-rolled steel plate by reasonable component design and matching with corresponding hot rolling, acid rolling and continuous annealing processes, has high strength and excellent plasticity, and is suitable for manufacturing automobile anti-collision parts.
Description
Technical Field
The invention belongs to the technical field of metallurgical plate production, and particularly relates to an ultrahigh-strength-ductility cold-rolled steel plate and a production method thereof.
Background
In order to adapt to the development trend of low energy consumption and high safety in the automobile industry, automobile manufacturers and steel enterprises actively focus on the light weight design of automobile bodies and the development of high-strength steel for automobiles.
At present, high-strength steel with tensile strength of over 980MPa generally adopts a two-phase or complex-phase structure regulation and control mode, the component design mainly adopts higher carbon and microalloy elements, the elongation of the steel plate is generally less than 15%, but in order to meet the cold forming processing requirement, the elongation needs to be improved to over 20% on the basis of keeping the tensile strength of over 980 MPa. This is difficult to implement for conventional texture design considerations as well as for continuous annealing processes.
Therefore, through the research of proper smelting component design and hot rolling, cold rolling and continuous annealing processes, the ultrahigh-strength and high-ductility cold-rolled steel plate and the production method thereof are developed, so that the steel plate has high strength and excellent plasticity, is suitable for manufacturing automobile anti-collision parts, and is a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide an ultrahigh-strength-ductility cold-rolled steel plate and a production method thereof. The invention designs and matches the corresponding hot rolling, acid rolling and continuous annealing processes through components, and the product has good comprehensive performance.
In order to solve the technical problems, the invention adopts the technical scheme that: the steel plate comprises the following chemical components in percentage by mass: c: 0.20 to 0.23%, Si: 1.20-1.40%, Mn: 1.90-2.10%, P is less than or equal to 0.020%, S is less than or equal to 0.008%, Als: 0.50-0.70%, Nb: 0.025 to 0.040%, Ti: 0.020-0.030 percent, less than or equal to 0.0050 percent of N, and the balance of iron and inevitable impurities.
The thickness of the steel plate is 1.0-2.0 mm.
The mechanical properties of the steel plate are as follows: the yield strength is more than or equal to 600MPa, the tensile strength is more than or equal to 980MPa, the elongation A80 is more than or equal to 20 percent, and the product of strength and elongation is more than or equal to 20 GPa.
The invention also provides a production method of the ultra-high product of strength and elongation cold-rolled steel plate, which comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling; in the hot rolling procedure, the slab is heated to 1250-1300 ℃, and the in-furnace time of the slab is 190-230 min; the rolling temperature of finish rolling is 1070-1100 ℃, the finishing temperature is 870-900 ℃, and the coiling temperature is 670-700 ℃.
According to the one-time continuous annealing process, the temperature of a soaking section is controlled to be 850-870 ℃, the soaking time is 80-200 s, the cooling speed of a slow cooling section is 2-6 ℃/s, the finishing temperature of slow cooling is 800-820 ℃, the cooling speed of a fast cooling section is 35-85 ℃/s, the finishing temperature of fast cooling is 270-290 ℃, and the temperature of an aging section is 250-270 ℃.
According to the secondary continuous annealing process, the temperature of a soaking section is controlled to be 780-820 ℃, the soaking time is 80-200 s, the cooling speed of a slow cooling section is 6-15 ℃/s, the finishing temperature of slow cooling is 660-700 ℃, the cooling speed of a fast cooling section is 20-50 ℃/s, the finishing temperature of fast cooling is 350-370 ℃, and the temperature of an aging section is 330-350 ℃.
In the acid rolling process, the reduction rate of acid rolling is more than or equal to 55%, the temperature of acid liquor is 80-90 ℃, and the thickness of a cold-rolled plate is 1.0-2.0 mm.
In the leveling process, the leveling elongation is controlled to be 0.5-0.8%.
The invention relates to a standard reference GB/T20564.9 for an ultra-high strength and elongation cold-rolled steel plate product; the product performance detection method is in standard reference GB/T228.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention adopts medium carbon, high silicon, high manganese, Nb and Ti microalloying in component design, and obtains the ultra-high strength-ductility cold-rolled steel sheet with the yield strength of more than or equal to 600MPa, the tensile strength of more than or equal to 980MPa, the elongation A80 of more than or equal to 20 percent and the strength-ductility product of more than or equal to 20GPa through reasonable component design and matching with corresponding hot rolling, acid rolling and continuous annealing processes, thereby having high strength and excellent plasticity and being suitable for manufacturing automobile anti-collision parts.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The thickness of the ultra-high product of strength and elongation cold-rolled steel sheet in the embodiment is 1.0mm, and the chemical composition and the mass percentage content thereof are shown in table 1.
The production method of the ultra-high strength and elongation cold-rolled steel plate comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling, and comprises the following specific process steps:
(1) a hot rolling procedure: continuously casting molten steel for steelmaking to obtain a continuous casting blank, heating a continuous casting slab to 1260 ℃, and keeping the slab in a furnace for 215 min; the initial rolling temperature of finish rolling is 1100 ℃, the finishing rolling temperature is 900 ℃, and the coiling temperature is 690 ℃;
(2) acid rolling process: the reduction rate of acid rolling is 54 percent, the temperature of acid liquor is 80 ℃, and the thickness of a cold-rolled sheet is 1.0 mm;
(3) a primary continuous annealing process: the temperature of the soaking section is controlled to be 870 ℃, the soaking time is 89s, the slow cooling speed is 5 ℃/s, the slow cooling finishing temperature is 820 ℃, the fast cooling speed is 78 ℃/s, the fast cooling finishing temperature is 290 ℃, and the temperature of the aging section is 270 ℃;
(4) a secondary continuous annealing process: the temperature of the soaking section is controlled to be 820 ℃, the soaking time is 89s, the slow cooling speed is 13 ℃/s, the slow cooling finishing temperature is 700 ℃, the fast cooling speed is 49 ℃/s, the fast cooling finishing temperature is 370 ℃, and the aging section temperature is 350 ℃;
(5) leveling: the flat elongation is controlled at 0.5%.
The mechanical properties of the ultra-high product cold-rolled steel sheet produced in this example are shown in table 2.
Example 2
The thickness of the ultra-high product of strength and elongation cold-rolled steel sheet in the embodiment is 1.2mm, and the chemical composition and the mass percentage content thereof are shown in table 1.
The production method of the ultra-high strength and elongation cold-rolled steel plate comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling, and comprises the following specific process steps:
(1) a hot rolling procedure: continuously casting molten steel for steelmaking to obtain a continuous casting blank, heating the continuous casting blank to 1290 ℃, and keeping the blank in the furnace for 230 min; the initial rolling temperature of finish rolling is 1095 ℃, the finishing rolling temperature is 875 ℃, and the coiling temperature is 680 ℃;
(2) acid rolling process: the reduction rate of the acid rolling is 60 percent, the temperature of the acid liquor is 82 ℃, and the thickness of the cold-rolled plate is 1.2 mm;
(3) a primary continuous annealing process: the temperature of the soaking section is controlled to 855 ℃, the soaking time is 107s, the cooling speed of the slow cooling section is 4.5 ℃/s, the finishing temperature of the slow cooling is 805 ℃, the cooling speed of the fast cooling section is 65 ℃/s, the finishing temperature of the fast cooling is 275 ℃, and the temperature of the aging section is 255 ℃;
(4) a secondary continuous annealing process: the temperature of the soaking section is controlled to be 795 ℃, the soaking time is 107s, the slow cooling speed is 11 ℃/s, the slow cooling finishing temperature is 675 ℃, the fast cooling speed is 39 ℃/s, the fast cooling finishing temperature is 355 ℃ and the aging section temperature is 335 ℃;
(5) leveling: the flat elongation is controlled at 0.6%.
The mechanical properties of the ultra-high product cold-rolled steel sheet produced in this example are shown in table 2.
Example 3
The thickness of the ultra-high product of strength and elongation cold-rolled steel sheet in the embodiment is 1.4mm, and the chemical composition and the mass percentage content thereof are shown in table 1.
The production method of the ultra-high strength and elongation cold-rolled steel plate comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling, and comprises the following specific process steps:
(1) a hot rolling procedure: continuously casting molten steel for steelmaking to obtain a continuous casting blank, heating the continuous casting blank to 1250 ℃, and keeping the blank in the furnace for 190 min; the initial rolling temperature of finish rolling is 1080 ℃, the finishing rolling temperature is 880 ℃, and the coiling temperature is 695 ℃;
(2) acid rolling process: the reduction rate of acid rolling is 64 percent, the temperature of acid liquor is 83 ℃, and the thickness of a cold-rolled sheet is 1.4 mm;
(3) a primary continuous annealing process: the temperature of the soaking section is controlled at 865 ℃, the soaking time is 125s, the slow cooling speed is 4 ℃/s, the slow cooling finishing temperature is 815 ℃, the fast cooling speed is 56 ℃/s, the fast cooling finishing temperature is 285 ℃, and the aging section temperature is 265 ℃;
(4) a secondary continuous annealing process: the temperature of the soaking section is controlled to be 805 ℃, the soaking time is 125s, the slow cooling speed is 9 ℃/s, the slow cooling finishing temperature is 685 ℃, the fast cooling speed is 34 ℃/s, the fast cooling finishing temperature is 360 ℃, and the temperature of the aging section is 340 ℃;
(5) leveling: the flat elongation is controlled at 0.6%.
The mechanical properties of the ultra-high product cold-rolled steel sheet produced in this example are shown in table 2.
Example 4
The thickness of the ultra-high product of strength and elongation cold-rolled steel plate in the embodiment is 1.6mm, and the chemical composition and the mass percentage content thereof are shown in table 1.
The production method of the ultra-high strength and elongation cold-rolled steel plate comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling, and comprises the following specific process steps:
(1) a hot rolling procedure: continuously casting molten steel for steelmaking to obtain a continuous casting blank, heating a continuous casting plate blank to 1300 ℃, wherein the time of the plate blank in a furnace is 205 min; the initial rolling temperature of finish rolling is 1083 ℃, the finishing temperature is 870 ℃, and the coiling temperature is 670 ℃;
(2) acid rolling process: the reduction rate of acid rolling is 52%, the temperature of the acid liquor is 87 ℃, and the thickness of the cold-rolled sheet is 1.6 mm;
(3) a primary continuous annealing process: the temperature of the soaking section is controlled to be 850 ℃, the soaking time is 143s, the slow cooling speed is 3 ℃/s, the slow cooling finishing temperature is 800 ℃, the fast cooling speed is 49 ℃/s, the fast cooling finishing temperature is 270 ℃, and the aging section temperature is 250 ℃;
(4) a secondary continuous annealing process: the temperature of the soaking section is controlled to be 780 ℃, the soaking time is 143s, the slow cooling speed is 8 ℃/s, the slow cooling finishing temperature is 660 ℃, the fast cooling speed is 28 ℃/s, the fast cooling finishing temperature is 350 ℃, and the aging section temperature is 330 ℃;
(5) leveling: the flat elongation is controlled at 0.7%.
The mechanical properties of the ultra-high product cold-rolled steel sheet produced in this example are shown in table 2.
Example 5
The thickness of the ultra-high product of strength and elongation cold-rolled steel sheet in the embodiment is 1.8mm, and the chemical composition and the mass percentage content thereof are shown in table 1.
The production method of the ultra-high strength and elongation cold-rolled steel plate comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling, and comprises the following specific process steps:
(1) a hot rolling procedure: continuously casting molten steel for steelmaking to obtain a continuous casting blank, heating a continuous casting plate blank to 1275 ℃, wherein the time of the plate blank in a furnace is 220 min; the initial rolling temperature of finish rolling is 1075 ℃, the finishing rolling temperature is 878 ℃, and the coiling temperature is 700 ℃;
(2) acid rolling process: the reduction rate of the acid rolling is 55 percent, the temperature of the acid liquor is 89 ℃, and the thickness of the cold-rolled sheet is 1.8 mm;
(3) a primary continuous annealing process: the temperature of the soaking section is controlled to be 860 ℃, the soaking time is 161s, the cooling speed of the slow cooling section is 3.5 ℃/s, the finishing temperature of the slow cooling is 810 ℃, the cooling speed of the fast cooling section is 43 ℃/s, the finishing temperature of the fast cooling is 280 ℃, and the temperature of the aging section is 260 ℃;
(4) a secondary continuous annealing process: the temperature of the soaking section is controlled to be 800 ℃, the soaking time is 161s, the slow cooling speed is 7 ℃/s, the slow cooling finishing temperature is 680 ℃, the fast cooling speed is 26 ℃/s, the fast cooling finishing temperature is 360 ℃, and the aging section temperature is 340 ℃;
(5) leveling: the flat elongation is controlled at 0.7%.
The mechanical properties of the ultra-high product cold-rolled steel sheet produced in this example are shown in table 2.
Example 6
The thickness of the ultra-high product of strength and elongation cold-rolled steel sheet in the embodiment is 2.0mm, and the chemical composition and the mass percentage content thereof are shown in table 1.
The production method of the ultra-high strength and elongation cold-rolled steel plate comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling, and comprises the following specific process steps:
(1) a hot rolling procedure: continuously casting molten steel for steelmaking to obtain a continuous casting blank, heating a continuous casting plate blank to 1280 ℃, wherein the time of the plate blank in a furnace is 195 min; the initial rolling temperature of finish rolling is 1070 ℃, the finishing rolling temperature is 892 ℃, and the coiling temperature is 675 ℃;
(2) acid rolling process: the reduction rate of acid rolling is 58 percent, the temperature of acid liquor is 90 ℃, and the thickness of a cold-rolled sheet is 2.0 mm;
(3) a primary continuous annealing process: the temperature of the soaking section is controlled at 865 ℃, the soaking time is 178s, the cooling speed of the slow cooling section is 5.5 ℃/s, the finishing temperature of the slow cooling is 815 ℃, the cooling speed of the fast cooling section is 39 ℃/s, the finishing temperature of the fast cooling is 285 ℃, and the temperature of the aging section is 265 ℃;
(4) a secondary continuous annealing process: the temperature of the soaking section is controlled to be 790 ℃, the soaking time is 178s, the slow cooling speed is 7 ℃/s, the slow cooling finishing temperature is 670 ℃, the fast cooling speed is 23 ℃/s, the fast cooling finishing temperature is 355 ℃ and the aging section temperature is 335 ℃;
(5) leveling: the flat elongation is controlled at 0.8%.
The mechanical properties of the ultra-high product cold-rolled steel sheet produced in this example are shown in table 2.
Example 7
The thickness of the ultra-high product of strength and elongation cold-rolled steel plate in the embodiment is 1.3mm, and the chemical composition and the mass percentage content thereof are shown in table 1.
The production method of the ultra-high strength and elongation cold-rolled steel plate comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling, and comprises the following specific process steps:
(1) a hot rolling procedure: continuously casting molten steel for steelmaking to obtain a continuous casting blank, heating a continuous casting plate blank to 1270 ℃, and keeping the plate blank in a furnace for 200 min; the initial rolling temperature of finish rolling is 1090 ℃, the finishing rolling temperature is 883 ℃, and the coiling temperature is 685 ℃;
(2) acid rolling process: the rolling reduction rate of the acid rolling is 56 percent, the temperature of the acid liquor is 88 ℃, and the thickness of the cold-rolled plate is 1.3 mm;
(3) a primary continuous annealing process: the temperature of the soaking section is controlled to be 852 ℃, the soaking time is 80s, the slow cooling speed is 2 ℃/s, the slow cooling finishing temperature is 817 ℃, the fast cooling speed is 85 ℃/s, the fast cooling finishing temperature is 277 ℃, and the temperature of the aging section is 258 ℃;
(4) a secondary continuous annealing process: the temperature of the soaking section is controlled at 785 ℃, the soaking time is 200s, the slow cooling speed is 15 ℃/s, the slow cooling finishing temperature is 690 ℃, the fast cooling speed is 20 ℃/s, the fast cooling finishing temperature is 365 ℃, and the temperature of the aging section is 345 ℃;
(5) leveling: the flat elongation is controlled at 0.5%.
The mechanical properties of the ultra-high product cold-rolled steel sheet produced in this example are shown in table 2.
Example 8
The thickness of the ultra-high product of strength and elongation cold-rolled steel sheet in the embodiment is 1.7mm, and the chemical composition and the mass percentage content thereof are shown in table 1.
The production method of the ultra-high strength and elongation cold-rolled steel plate comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling, and comprises the following specific process steps:
(1) a hot rolling procedure: continuously casting molten steel for steelmaking to obtain a continuous casting blank, heating the continuous casting blank to 1255 ℃, and keeping the blank in the furnace for 210 min; the initial rolling temperature of finish rolling is 1095 ℃, the finishing rolling temperature is 887 ℃, and the coiling temperature is 692 ℃;
(2) acid rolling process: the reduction rate of acid rolling is 62%, the temperature of acid liquor is 85 ℃, and the thickness of a cold-rolled sheet is 1.7 mm;
(3) a primary continuous annealing process: the temperature of the soaking section is controlled to be 867 ℃, the soaking time is 200s, the slow cooling speed is 6 ℃/s, the slow cooling finishing temperature is 808 ℃, the fast cooling speed is 35 ℃/s, the fast cooling finishing temperature is 283 ℃ and the aging section temperature is 262 ℃;
(4) a secondary continuous annealing process: the temperature of the soaking section is controlled at 810 ℃, the soaking time is 80s, the slow cooling speed is 6 ℃/s, the slow cooling finishing temperature is 695 ℃, the fast cooling speed is 50 ℃/s, the fast cooling finishing temperature is 357 ℃ and the aging section temperature is 338 ℃;
(5) leveling: the flat elongation is controlled at 0.8%.
The mechanical properties of the ultra-high product cold-rolled steel sheet produced in this example are shown in table 2.
Table 1 examples 1-8 chemical composition and mass% of ultra-high tensile elongation cold-rolled steel sheet
The balance of the ingredients in table 1 is iron and unavoidable impurities.
TABLE 2 mechanical Properties of ultra-high Strength product Cold-rolled Steel sheets 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 (6)
1. The cold-rolled steel plate with the ultrahigh product of strength and elongation is characterized by comprising the following chemical components in percentage by mass: c: 0.20 to 0.23%, Si: 1.20-1.40%, Mn: 1.90-2.08%, P is less than or equal to 0.020%, S is less than or equal to 0.008%, Als: 0.50-0.70%, Nb: 0.025-0.038%, Ti: 0.020-0.030 percent of N, less than or equal to 0.0050 percent of N, and the balance of iron and inevitable impurities;
the steel plate is produced by the following production method: comprises the working procedures of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling; in the hot rolling process, the plate blank is heated to 1250-1300 ℃, the furnace time of the plate blank is 190-230 min, the finish rolling start temperature is 1070-1100 ℃, the finish rolling temperature is 870-900 ℃, and the coiling temperature is 670-700 ℃; in the primary continuous annealing process, the temperature of a soaking section is controlled to be 850-870 ℃, the soaking time is 80-200 s, the cooling speed of a slow cooling section is 2-6 ℃/s, the finishing temperature of slow cooling is 800-820 ℃, the cooling speed of a fast cooling section is 35-85 ℃/s, the finishing temperature of fast cooling is 270-290 ℃, and the temperature of an aging section is 250-270 ℃; in the secondary continuous annealing process, the temperature of a soaking section is controlled to be 780-820 ℃, the soaking time is 80-200 s, the cooling speed of a slow cooling section is 6-15 ℃/s, the finishing temperature of slow cooling is 660-700 ℃, the cooling speed of a fast cooling section is 20-50 ℃/s, the finishing temperature of fast cooling is 350-370 ℃, and the temperature of an aging section is 330-350 ℃.
2. The ultra-high product of strength and elongation cold rolled steel sheet of claim 1, wherein the steel sheet has a thickness specification of: 1.0-2.0 mm.
3. The cold-rolled steel sheet with ultra-high product of strength and elongation as claimed in claim 1, wherein the mechanical properties of the steel sheet are as follows: the yield strength is more than or equal to 600MPa, the tensile strength is more than or equal to 980MPa, the elongation A80 is more than or equal to 20 percent, and the product of strength and elongation is more than or equal to 20 GPa.
4. The method for producing the ultra-high product of strength and elongation cold rolled steel sheet according to any one of claims 1 to 3, wherein the method comprises the steps of steel making, continuous casting, hot rolling, acid rolling, primary continuous annealing, secondary continuous annealing and leveling; in the hot rolling process, the plate blank is heated to 1250-1300 ℃, the furnace time of the plate blank is 190-230 min, the finish rolling start temperature is 1070-1100 ℃, the finish rolling temperature is 870-900 ℃, and the coiling temperature is 670-700 ℃; in the primary continuous annealing process, the temperature of a soaking section is controlled to be 850-870 ℃, the soaking time is 80-200 s, the cooling speed of a slow cooling section is 2-6 ℃/s, the finishing temperature of slow cooling is 800-820 ℃, the cooling speed of a fast cooling section is 35-85 ℃/s, the finishing temperature of fast cooling is 270-290 ℃, and the temperature of an aging section is 250-270 ℃; in the secondary continuous annealing process, the temperature of a soaking section is controlled to be 780-820 ℃, the soaking time is 80-200 s, the cooling speed of a slow cooling section is 6-15 ℃/s, the finishing temperature of slow cooling is 660-700 ℃, the cooling speed of a fast cooling section is 20-50 ℃/s, the finishing temperature of fast cooling is 350-370 ℃, and the temperature of an aging section is 330-350 ℃.
5. The method for producing the cold-rolled steel plate with the ultrahigh product of strength and elongation as claimed in claim 4, wherein in the acid rolling process, the reduction rate of acid rolling is not less than 55%, the temperature of acid liquor is 80-90 ℃, and the thickness of the cold-rolled steel plate is 1.0-2.0 mm.
6. The method of claim 4 or 5, wherein the flattening process is performed while the flattening elongation is controlled to be 0.5-0.8%.
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