CN103938101A - Steel plate and preparation method thereof - Google Patents
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Abstract
The invention relates to a steel plate and a preparation method thereof. The steel plate is a 500MPa grade cold-rolled dual-phase steel plate and comprises the following components by mass percent: 0.03-0.08% of C, 0.2-0.4% of Si, 1.0-1.7% of Mn, 0.020-0.060% of Als, not more than 0.4% of Cr, not more than 0.01% of P, not more than 0.01% of S and the balance of Fe and inevitable impurities. The method comprises the following steps: smelting; forging and hot rolling; acid pickling and cold rolling; continuous annealing; finished product obtaining. The steel plate has the beneficial effects that on the basis of a C-Mn system, the contents of C and alloying elements are reduced and the steel plate has the characteristics of high tensile strength, good welding property, low yield ratio, good strengthening and toughening matching, good stamping property, high initial work hardening rate and the like; the content of Si in the design is lower and meanwhile high hydrogen annealing is adopted in the continuous annealing production process, so that the produced dual-phase steel has better surface quality; meanwhile, as proper amount of Si is added, the alloying elements can be reduced, the comprehensive mechanical properties of the dual-phase steel can be greatly improved and the cost is reduced.
Description
Technical field
The invention belongs to technical field of steel rolling, relate to the high-strength steel manufacture of automobile structure and Abdeckteil, be specifically related to tensile strength 500MPa level cold-rolled biphase steel plate and manufacture method thereof.
Background technology
The exploitation of high tensile steel plate adapts to the trend of conservation-minded society and automotive light weight technology development, is the current and even later important development direction of ferrous materials.Dual phase steel, owing to having higher intensity, good ductility, low yield strength ratio, high initial manufacture hardening rate and welding property preferably, is widely used in automobile industry.Iron and steel enterprise has all carried out the exploitation of the dual phase steel of different stage both at home and abroad at present, but studies less for 500MPa level dual phase steel.For 500MPa level dual phase steel, it both can be used as the structural part of automobile, but also can be as the Abdeckteil of lightweight automobile.Compared with IF steel, there is the advantages such as tensile strength is high, baking hardenability is higher, strength and ductility product is high, dent resistance is good with the al-killed that is used as automobile panel at present; With as compared with the low-alloy high-strength steel of automobile structure, have without yield extension, without ageing, yield tensile ratio is low, alloy content is low, plasticity and the advantage such as weldability is good.
China Patent No. be CN101781739A's " automobile cold-rolled dual-phase steel with tensile strength of 500 MPa ", introduced the cold-rolled biphase steel plate containing Cr, its yield strength is more than 300～350MPa, tensile strength is 520～560MPa.Its composition and organizational composition: % contains by weight, C:0.05%～0.2%, Mn:0.5%～2.0%, Si:0.02～0.049%, Cr:0.1～0.5%, Als:0.01%～0.1%, P:0.003～0.01%, S:0.003～0.01%, surplus is iron.On hot dip process simulated experiment machine, carry out annealing experiment, sample, after 780～820 DEG C of insulation 100s, is quickly cooled to room temperature with 30 DEG C/s and above speed of cooling after slow cooling to 650 DEG C.From this Patent, owing to not adding row's carbon Si, Al etc., the dual phase steel unit elongation of producing and ageing poor, yield tensile ratio is higher; Simultaneously Mn, Cr content are higher, and cost is higher.
Domestic certain colleges and universities have researched and developed a kind of tensile strength 500MPa level dual phase steel, its chemical composition is C:0.06%～0.09%, Mn:1.5%～1.7%, Si:0.25%～0.5%, Als:0.02%～0.1%, P :≤0.015%, S :≤0.01%, surplus is iron.Sample, after 760～840 DEG C of insulation 80s, is quickly cooled to room temperature with 15～45 DEG C/s and above speed of cooling after slow cooling to 620 DEG C～720 DEG C.Its C, Mn content are higher, have worsened unit elongation and the welding property of material, and its comprehensive mechanical property is poor.
Summary of the invention
The object of the present invention is to provide a kind of steel plate and preparation method thereof, especially the manufacture method of automobile cold-rolled dual-phase steel with tensile strength of 500 MPa steel plate.On the basis of C-Mn system, reduce C content, reduce alloying element content, and its tensile strength is high, good welding performance, yield tensile ratio is low, and highly malleablized matches, and punching performance is good, initial manufacture cementation index high; Because Si content in design is lower, connect simultaneously and move back production process and adopt high hydrogen annealing, the dual phase steel surface quality therefore produced is better; Simultaneously adding in right amount of Si, can reduce use alloying element, greatly improve the comprehensive mechanical property of dual phase steel, reduce cost.
Concrete technical scheme is as follows:
A kind of steel plate, it is 500MPa level cold-rolled biphase steel steel plate, composition according to mass percent is: C:0.03%～0.08%, Si:0.2～0.4%, Mn:1.0%～1.7%, Als:0.020%～0.060%, Cr≤0.4%, P≤0.01%, S≤0.01%, surplus is Fe and inevitable impurity.
Further, it is automobile high-strength cold-rolled biphase steel plate, and yield strength is 220MPa～300MPa, and tensile strength is 490MPa～550MPa, and unit elongation is 25%～30%
The preparation method of above-mentioned steel plate, comprises the steps:
(1) smelt;
(2) forging and hot rolling;
(3) pickling and cold-rolling;
(4) continuous annealing;
(5) obtain finished product.
Further, its continuous annealing main technologic parameters is: after 760～800 DEG C of insulation 120s, cooling fast with 30 DEG C/s and above speed of cooling behind slow cooling to 670～700 DEG C, and then 290～300 DEG C of overaging processing.
Further, cold rolling draft is controlled at 60～80%.
Further, steel plate composition according to mass percent is: C:0.04%, Mn:1.56%, Si:0.26%, Cr:0.35%; Surplus is iron and inevitable impurity, processing parameter is selected: continuous annealing temperature is 760 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing, the cold-rolled biphase steel panel products yield strength obtaining is 248MPa, tensile strength is 524MPa, and unit elongation is that 29%, n value is 0.18.、
Further, steel plate composition according to mass percent is: C:0.04%, Mn:1.56%, Si:0.26%, Cr:0.38%; Surplus is iron and inevitable impurity, processing parameter is selected: continuous annealing temperature is 780 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing, the cold-rolled biphase steel panel products yield strength obtaining is 238MPa, tensile strength is 522MPa, and unit elongation is that 28%, n value is 0.19.
Further, steel plate composition according to mass percent is: C:0.05%, Mn:1.5%, Si:0.25%, Cr:0.20%, surplus is iron and inevitable impurity, processing parameter is selected: continuous annealing temperature is 760 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing, the cold-rolled biphase steel panel products yield strength obtaining is 243MPa, and tensile strength is 497MPa, unit elongation is that 28%, n value is 0.20.
Further, steel plate composition according to mass percent is: C:0.05%, Mn:1.5%, Si:0.25%, Cr:0.20%, surplus is iron and inevitable impurity, processing parameter is selected: continuous annealing temperature is 780 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing, the cold-rolled biphase steel panel products yield strength obtaining is 263MPa, and tensile strength is 521MPa, unit elongation is that 27%, n value is 0.19.
Further, steel plate composition according to mass percent is: C:0.06%, Mn:1.59%, Si:0.33%; Surplus is iron and inevitable impurity, processing parameter is selected: continuous annealing temperature is 780 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 700 DEG C, then 320 DEG C of overaging processing, the cold-rolled biphase steel panel products yield strength obtaining is 260MPa, tensile strength is 545MPa, and unit elongation is that 28%, n value is 0.20.
Compared with currently available technology, the present invention, on the basis of C-Mn system, reduces C content, reduce alloying element content, and its tensile strength is high, good welding performance, and yield tensile ratio is low, and highly malleablized matches, and punching performance is good, initial manufacture cementation index high; Because Si content in design is lower, connect simultaneously and move back production process and adopt high hydrogen annealing, the dual phase steel surface quality therefore produced is better; Simultaneously adding in right amount of Si, can reduce use alloying element, greatly improve the comprehensive mechanical property of dual phase steel, reduce cost.
Embodiment
Be a kind of preferred embodiment in numerous embodiments of the present invention below.
The present embodiment aims to provide the manufacture method of automobile cold-rolled dual-phase steel with tensile strength of 500 MPa steel plate.Its main chemical compositions mass percent is: C:0.03%～0.08%, Si:0.2～0.4%, Mn:1.0%～1.7%, Als:0.020%～0.060%, Cr≤0.4%, P≤0.01%, S≤0.01%, surplus is Fe.
C: the most effective strengthening element is to form martensitic principal element, and in steel, carbon content has determined intensity and the martensitic pattern of dual phase steel; But, ensure to there is good welding property and higher unit elongation, require lower carbon content, so the weight percent of C is controlled at 0.03%～0.08% lower scope in the present invention.
Si: ferritic solution strengthening element, accelerate carbon to austenitic segregation, the solid solution carbon in ferrite is had and removed and cleaning action, contribute to improve the ductility of dual phase steel.But affect plate surface quality for fear of the refractory oxide forming at surface of steel plate because of Si too high levels, reduce the silicone content in cylinder, so Si weight percentage of the present invention is controlled at 0.2～0.4% as far as possible.
Mn: belong to typical stabilization of austenite and learn element, can significantly improve the hardening capacity of steel, and play the effect of solution strengthening and refinement ferrite crystal grain, can significantly postpone perlitic transformation and bainite transformation.But Mn, as the element that expands austenitic area, in the time that high manganese content is postponed perlitic transformation, also can postpone ferritic separating out; And the too low perlitic transformation that easily causes of manganese content, so Mn weight percent content of the present invention is controlled at 1.4%～1.7%.
Cr: middle carbide, significantly improve the hardening capacity of steel, can strongly postpone perlitic transformation and bainite transformation, and expand and batch window.Though Cr is weak solution strengthening element, can increase austenitic cold energy power excessively, thereby thinning microstructure plays strengthening effect.So Cr weight percent content of the present invention is controlled at and is less than in 0.4% scope.
The present invention compared with prior art, its feature: because Si content in Composition Design is suitable, contribute to separating out of solid solution carbon in ferrite, purify ferrite, improved the ductility of dual phase steel.In mechanical property, ensure that tensile strength is high, lower yield tensile ratio, good unit elongation, and there is good ageing resistance performance.
The present embodiment adopts above-mentioned chemical composition, and manufacturing process flow process is:
Smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
The present embodiment adopts above chemical composition and technical process production tensile strength to be greater than the automobile cold-rolled dual phase sheet steel of 500MPa, and embodiment is as follows:
1) chemical composition of automobile high-strength cold-rolled biphase steel plate is optimized to design, does not add expensive alloying element, utilize the build up of C, Mn element, the intensity that solution strengthening improves product.
2) cold rolling draft is controlled at 60～80%, makes full use of the strengthening effect of cold rolling work hardening.Obtain the chill state cold-reduced sheet of thickness 1.5mm.
3) experimental steel carries out continuous annealing experiment on Multipas continuous annealing simulator, actual in conjunction with industry, sample is after 760～800 DEG C of insulation 120s, cooling fast with 30 DEG C/s and above speed of cooling behind slow cooling to 670～700 DEG C, then 290～300 DEG C of overaging processing.
Preferred embodiment 1:
Chemical composition (mass percent) C:0.04% of steel, Mn:1.56%, Si:0.26%, Cr:0.35%; Surplus is iron and inevitable impurity.
Its technical process is: smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Processing parameter: continuous annealing temperature is 760 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing.The cold-rolled biphase steel panel products yield strength obtaining is 248MPa, and tensile strength is 524MPa, and unit elongation is that 29%, n value is 0.18.
Preferred embodiment 2:
Chemical composition (mass percent) C:0.04% of steel, Mn:1.56%, Si:0.26%, Cr:0.38%; Surplus is iron and inevitable impurity.
Its technical process is: smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Processing parameter: continuous annealing temperature is 780 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing.The cold-rolled biphase steel panel products yield strength obtaining is 238MPa, and tensile strength is 522MPa, and unit elongation is that 28%, n value is 0.19.
Preferred embodiment 3:
Chemical composition (mass percent) C:0.05% of steel, Mn:1.5%, Si:0.25%, Cr:0.20%, surplus is iron and inevitable impurity.
Its technical process is:
Smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Processing parameter:
Continuous annealing temperature is 760 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing.The cold-rolled biphase steel panel products yield strength obtaining is 243MPa, and tensile strength is 497MPa, and unit elongation is that 28%, n value is 0.20.
Preferred embodiment 4:
Chemical composition (mass percent) C:0.05% of steel, Mn:1.5%, Si:0.25%, Cr:0.20%, surplus is iron and inevitable impurity.
Its technical process is:
Smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Processing parameter:
Continuous annealing temperature is 780 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing.The cold-rolled biphase steel panel products yield strength obtaining is 263MPa, and tensile strength is 521MPa, and unit elongation is that 27%, n value is 0.19.
Preferred embodiment 5:
Chemical composition (mass percent) C:0.06% of steel, Mn:1.59%, Si:0.33%; Surplus is iron and inevitable impurity.
Its technical process is:
Smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Processing parameter:
Continuous annealing temperature is 780 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 700 DEG C, then 320 DEG C of overaging processing.The cold-rolled biphase steel panel products yield strength obtaining is 260MPa, and tensile strength is 545MPa, and unit elongation is that 28%, n value is 0.20.
Preferred embodiment 6:
Chemical composition (mass percent) C:0.06% of steel, Mn:1.59%, Si:0.33%; Surplus is iron and inevitable impurity.
Its technical process is:
Smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Processing parameter:
Continuous annealing temperature is 800 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 700 DEG C, then 320 DEG C of overaging processing.The cold-rolled biphase steel panel products yield strength obtaining is 280MPa, and tensile strength is 550MPa, and unit elongation is that 26%, n value is 0.19.
Preferred embodiment 7:
Chemical composition (mass percent) C:0.07% of steel, Mn:1.43%, Si:0.26%; Surplus is iron and inevitable impurity.
Its technical process is:
Smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Processing parameter:
Continuous annealing temperature is 760 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 700 DEG C, then 320 DEG C of overaging processing.The cold-rolled biphase steel panel products yield strength obtaining is 275MPa, and tensile strength is 550MPa, and unit elongation is that 27%, n value is 0.20.
The automobile high-strength cold-rolled biphase steel plate that adopts chemical composition of the present invention, technical process and concrete grammar and step to produce, yield strength is 220MPa～300MPa, and tensile strength is 490MPa～550MPa, and unit elongation is 25%～30%.
Above the present invention is exemplarily described; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method of the present invention design and technical scheme to carry out, or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (10)
1. a steel plate, it is characterized in that, it is 500MPa level cold-rolled biphase steel steel plate, composition according to mass percent is: C:0.03%～0.08%, Si:0.2～0.4%, Mn:1.0%～1.7%, Als:0.020%～0.060%, Cr≤0.4%, P≤0.01%, S≤0.01%, surplus is Fe and inevitable impurity.
2. steel plate as claimed in claim 1, is characterized in that, it is automobile high-strength cold-rolled biphase steel plate, and yield strength is 220MPa～300MPa, and tensile strength is 490MPa～550MPa, and unit elongation is 25%～30%.
3. the preparation method of steel plate as described in claim 1 and 2, is characterized in that, comprises the steps:
(1) smelt;
(2) forging and hot rolling;
(3) pickling and cold-rolling;
(4) continuous annealing;
(5) obtain finished product.
4. steel plate preparation method as claimed in claim 3, it is characterized in that, its continuous annealing main technologic parameters is: after 760～800 DEG C of insulation 120s, cooling fast with 30 DEG C/s and above speed of cooling behind slow cooling to 670～700 DEG C, and then 290～300 DEG C of overaging processing.
5. the steel plate preparation method as described in claim 3 or 4, is characterized in that, cold rolling draft is controlled at 60～80%.
6. the steel plate preparation method as described in any one in claim 3-5, is characterized in that, steel plate composition according to mass percent is: C:0.04%, Mn:1.56%, Si:0.26%, Cr:0.35%; Surplus is iron and inevitable impurity, processing parameter is selected: continuous annealing temperature is 760 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing, the cold-rolled biphase steel panel products yield strength obtaining is 248MPa, tensile strength is 524MPa, and unit elongation is that 29%, n value is 0.18.
7. the steel plate preparation method as described in any one in claim 3-5, is characterized in that, steel plate composition according to mass percent is: C:0.04%, Mn:1.56%, Si:0.26%, Cr:0.38%; Surplus is iron and inevitable impurity, processing parameter is selected: continuous annealing temperature is 780 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing, the cold-rolled biphase steel panel products yield strength obtaining is 238MPa, tensile strength is 522MPa, and unit elongation is that 28%, n value is 0.19.
8. the steel plate preparation method as described in any one in claim 3-5, it is characterized in that, steel plate composition according to mass percent is: C:0.05%, Mn:1.5%, Si:0.25%, Cr:0.20%, surplus is iron and inevitable impurity, processing parameter is selected: continuous annealing temperature is 760 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing, the cold-rolled biphase steel panel products yield strength obtaining is 243MPa, tensile strength is 497MPa, and unit elongation is that 28%, n value is 0.20.
9. the steel plate preparation method as described in any one in claim 3-5, it is characterized in that, steel plate composition according to mass percent is: C:0.05%, Mn:1.5%, Si:0.25%, Cr:0.20%, surplus is iron and inevitable impurity, processing parameter is selected: continuous annealing temperature is 780 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 690 DEG C, then 290 DEG C of overaging processing, the cold-rolled biphase steel panel products yield strength obtaining is 263MPa, tensile strength is 521MPa, and unit elongation is that 27%, n value is 0.19.
10. the steel plate preparation method as described in any one in claim 3-5, is characterized in that, steel plate composition according to mass percent is: C:0.06%, Mn:1.59%, Si:0.33%; Surplus is iron and inevitable impurity, processing parameter is selected: continuous annealing temperature is 780 DEG C, cooling fast with 30 DEG C/s and above speed of cooling after slow cooling to 700 DEG C, then 320 DEG C of overaging processing, the cold-rolled biphase steel panel products yield strength obtaining is 260MPa, tensile strength is 545MPa, and unit elongation is that 28%, n value is 0.20.
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| CN106987772A (en) * | 2017-04-28 | 2017-07-28 | 武汉钢铁有限公司 | High-strength fireproof weathering steel and its production method |
| CN107099736A (en) * | 2017-06-06 | 2017-08-29 | 武汉钢铁有限公司 | The production method of 500MPa grades of cold-rolled biphase steels |
| CN111172466A (en) * | 2020-03-04 | 2020-05-19 | 马鞍山钢铁股份有限公司 | Plasticity-enhanced cold-rolled dual-phase steel with tensile strength of 590MPa and production method thereof |
| CN115807188A (en) * | 2022-11-23 | 2023-03-17 | 徐工集团工程机械股份有限公司 | Low-carbon steel and preparation method thereof |
| CN115852263A (en) * | 2022-11-28 | 2023-03-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-cost 450 MPa-grade continuous annealing dual-phase steel and preparation method thereof |
| CN116288001A (en) * | 2023-03-07 | 2023-06-23 | 江阴市南车机车配件有限公司 | Device and method for manufacturing cold-rolled flat steel with high yield strength and cold-rolled flat steel |
| CN115807188B (en) * | 2022-11-23 | 2024-04-30 | 徐工集团工程机械股份有限公司 | Low-carbon steel and preparation method thereof |
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| CN111172466A (en) * | 2020-03-04 | 2020-05-19 | 马鞍山钢铁股份有限公司 | Plasticity-enhanced cold-rolled dual-phase steel with tensile strength of 590MPa and production method thereof |
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| CN115807188B (en) * | 2022-11-23 | 2024-04-30 | 徐工集团工程机械股份有限公司 | Low-carbon steel and preparation method thereof |
| CN115852263A (en) * | 2022-11-28 | 2023-03-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-cost 450 MPa-grade continuous annealing dual-phase steel and preparation method thereof |
| CN116288001A (en) * | 2023-03-07 | 2023-06-23 | 江阴市南车机车配件有限公司 | Device and method for manufacturing cold-rolled flat steel with high yield strength and cold-rolled flat steel |
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