CN103938101B - A kind of steel plate and preparation method thereof - Google Patents
A kind of steel plate and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of steel plate and preparation method thereof, it is 500MPa level dual-phase 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%, and surplus is Fe and inevitable impurity.Method comprises the steps: to smelt；Forging and hot rolling；Pickling and cold-rolling；Continuous annealing；Obtain finished product.On the basis of C Mn system, reduce C content, reduce alloying element content, and its tensile strength high, good welding performance, yield tensile ratio is low, and Strengthening and Toughening matches, and punching performance is good, initial manufacture hardening ratio high；Owing in design, Si content is relatively low, connecting simultaneously and move back the production process high hydrogen annealing of employing, the dual phase steel surface quality therefore produced is preferable；The appropriate addition of Si simultaneously, it is possible to reduce use alloying element, be greatly improved the comprehensive mechanical property of dual phase steel, reduce cost.
Description
Technical field
The invention belongs to technical field of steel rolling, relate to the high strength steel manufacture of automobile structure and covering, be specifically related to tension strong
Degree 500MPa level cold-rolled biphase steel plate and manufacture method thereof.
Background technology
The exploitation of high-strength steel sheet adapts to conservation-minded society and the trend of automotive light weight technology development, be ferrous materials current so that after
Important development direction.Dual phase steel is hard owing to having higher intensity, good ductility, low yield strength ratio, high initial manufacture
Change speed and preferable welding performance, be widely used in auto manufacturing.Iron and steel enterprise opens the most the most both at home and abroad
Open up the exploitation of the dual phase steel of different stage, but less for the research of 500MPa level dual phase steel.For 500MPa level dual phase steel
For, it both can serve as the structural member of automobile, but also can serve as the covering of lightweight automobile.With currently used as automobile
The al-killed of covering is compared with IF steel, and it is excellent to have that tensile strength is high, baking hardenability is higher, strength and ductility product is high, dent resistance is good etc.
Point；With compared with the low-alloy high-strength steel of automobile structure, have without surrender extend, without ageing, yield tensile ratio is low, alloy
The advantages such as content is low, formability is good with weldability.
China Patent No. is " automobile cold-rolled dual-phase steel with tensile strength of 500 MPa " of CN101781739A, describes containing Cr
Cold-rolled biphase steel plate, its yield strength is 300～more than 350MPa, and tensile strength is 520～560MPa.Its composition and tissue
Constitute: % by weight contains, 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 ferrum.On hot-dip simulated experiment machine
Carrying out annealing experiment, sample is after 780～820 DEG C of insulation 100s, with 30 DEG C/s and above rate of cooling after slow cooling to 650 DEG C
It is quickly cooled to room temperature.From the point of view of this Patent, owing to not adding row carbon Si, Al etc., the dual phase steel produced prolongs
Rate of stretching is poor with ageing, and yield tensile ratio is higher；Mn, Cr content is higher simultaneously, relatively costly.
Certain colleges and universities domestic have developed a kind of tensile strength 500MPa level dual phase steel, and 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 ferrum.
Sample is after 760～840 DEG C of insulation 80s, with 15～45 DEG C/s and the fast quickly cooling of above rate of cooling after slow cooling to 620 DEG C～720 DEG C
But to room temperature.Its C, Mn content is higher, is degrading elongation percentage and the welding performance of material, and its comprehensive mechanical property is poor.
Summary of the invention
It is an object of the invention to provide a kind of steel plate and preparation method thereof, the especially automobile cold-rolled two-phase of tensile strength 500MPa level
The manufacture method of steel 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 Strengthening and Toughening matches, and punching performance is good, initial manufacture hardening ratio high；Owing to setting
In meter, Si content is relatively low, connects simultaneously and moves back the production process high hydrogen annealing of employing, and the dual phase steel surface quality therefore produced is preferable；With
Time Si appropriate addition, it is possible to reduce use alloying element, be greatly improved 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 dual-phase steel plate, and 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, elongation percentage 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) finished product is obtained.
Further, its continuous annealing main technologic parameters is: after 760～800 DEG C of insulation 120s, after slow cooling to 670～700 DEG C
Quickly cool down with 30 DEG C/s and above rate of cooling, then at 290～300 DEG C of Wetted constructures.
Further, cold rolling reduction ratio controls 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 ferrum and inevitable impurity, and technological parameter selects: continuous annealing temperature is 760 DEG C, with 30 DEG C after slow cooling to 690 DEG C
/ s and above rate of cooling quickly cool down, and then at 290 DEG C of Wetted constructures, the cold-rolled biphase steel panel products obtained surrender is strong
Degree is 248MPa, and tensile strength is 524MPa, and elongation percentage is 29%, and 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 ferrum and inevitable impurity, and technological parameter selects: continuous annealing temperature is 780 DEG C, with 30 DEG C after slow cooling to 690 DEG C
/ s and above rate of cooling quickly cool down, and then at 290 DEG C of Wetted constructures, the cold-rolled biphase steel panel products obtained surrender is strong
Degree is 238MPa, and tensile strength is 522MPa, and elongation percentage is 28%, and 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 ferrum and inevitable impurity, and technological parameter selects: continuous annealing temperature is 760 DEG C, with 30 DEG C after slow cooling to 690 DEG C
/ s and above rate of cooling quickly cool down, and then at 290 DEG C of Wetted constructures, the cold-rolled biphase steel panel products obtained surrender is strong
Degree is 243MPa, and tensile strength is 497MPa, and elongation percentage is 28%, and 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 ferrum and inevitable impurity, and technological parameter selects: continuous annealing temperature is 780 DEG C, with 30 DEG C after slow cooling to 690 DEG C
/ s and above rate of cooling quickly cool down, and then at 290 DEG C of Wetted constructures, the cold-rolled biphase steel panel products obtained surrender is strong
Degree is 263MPa, and tensile strength is 521MPa, and elongation percentage is 27%, and 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 ferrum
With inevitable impurity, technological parameter select: continuous annealing temperature is 780 DEG C, after slow cooling to 700 DEG C with 30 DEG C/s and with
On rate of cooling quickly cool down, then at 320 DEG C of Wetted constructures, the cold-rolled biphase steel panel products yield strength obtained is
260MPa, tensile strength is 545MPa, and elongation percentage is 28%, and n value is 0.20.
Compared with currently available technology, the present invention, on the basis of C-Mn system, reduces C content, reduces alloying element content, and
Its tensile strength is high, good welding performance, and yield tensile ratio is low, and Strengthening and Toughening matches, and punching performance is good, and initial manufacture hardening ratio is high
Etc. feature；Owing in design, Si content is relatively low, connect simultaneously and move back the production process high hydrogen annealing of employing, the dual phase steel table therefore produced
Face quality is preferable；The appropriate addition of Si simultaneously, it is possible to reduce use alloying element, be greatly improved the comprehensive mechanical property of dual phase steel,
Reduce cost.
Detailed description of the invention
It is 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 primary chemical becomes
Point 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: maximally effective intensified element, is the essential element forming martensite, and in steel, carbon content determines intensity and the horse of dual phase steel
The pattern of family name's body；But, it is ensured that there is good welding performance and higher elongation percentage, it is desirable to relatively low carbon content, so this
In invention, the percentage by weight of C controls in the relatively low scope of 0.03%～0.08%.
Si: ferritic solution strengthening element, accelerates the carbon segregation to austenite, has removing to the solid solution carbon in ferrite with clean
Change effect, is favorably improved the ductility of dual phase steel.But in order to avoid the high-melting-point oxygen formed at surface of steel plate because of Si too high levels
Compound and affect plate surface quality, reduce the silicone content in cylinder, so Si weight percentage of the present invention controls as far as possible
0.2～0.4%.
Mn: belong to typical case's stabilization of austenite element, it is possible to significantly improve the quenching degree of steel, and play solution strengthening and refinement
The effect of ferrite crystal grain, can significantly postpone perlitic transformation and bainite transformation.But Mn is as the element of expansion austenitic area,
While high Fe content postpones perlitic transformation, also can postpone ferritic precipitation；And Fe content is the lowest easily causes pearl
Body of light changes, so Mn weight percent content of the present invention controls 1.4%～1.7%.
Cr: middle carbide, significantly improves the quenching degree of steel, can strongly postpone perlitic transformation and bainite transformation,
And expand and batch window.Though Cr is weak solution strengthening element, but the supercool ability of austenite can be increased, thus thinning microstructure,
Play invigoration effect.So Cr weight percent content of the present invention controls in the range of less than 0.4%.
The present invention compared with prior art, its feature: in designing due to composition, Si content is suitable, contributes to solid solution carbon in ferrite
Precipitation, purify ferrite, improve the ductility of dual phase steel.Ensure that in mechanical property that tensile strength is high, relatively low yield tensile ratio,
Good elongation percentage, and there is good ageing resistance performance.
The present embodiment uses 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 uses above chemical composition and technological process to produce the tensile strength automobile cold-rolled dual phase steel more than 500MPa
Plate, detailed description of the invention is as follows:
1) chemical composition of automobile high-strength cold-rolled biphase steel plate is optimized design, without expensive alloy unit
Element, utilizes the build up of C, Mn element, solution strengthening to improve the intensity of product.
2) cold rolling reduction ratio controls, 60～80%, to make full use of cold reduced work hardened strengthening effect.Obtain thickness 1.5mm's
Chill state cold-reduced sheet.
3) experiment steel carries out continuous annealing experiment on Multipas continuous annealing simulator, and actual in conjunction with industry, sample exists
After 760～800 DEG C of insulation 120s, quickly cool down with 30 DEG C/s and above rate of cooling after slow cooling to 670～700 DEG C, then exist
290～300 DEG C of Wetted constructures.
Preferred embodiment 1:
Chemical composition (mass percent) C:0.04% of steel, Mn:1.56%, Si:0.26%, Cr:0.35%；Surplus is ferrum
With inevitable impurity.
Its technological process is: smelts → forges and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Technological parameter: continuous annealing temperature is 760 DEG C, with 30 DEG C/s and the fast quickly cooling of above rate of cooling after slow cooling to 690 DEG C
But, then at 290 DEG C of Wetted constructures.The cold-rolled biphase steel panel products yield strength obtained is 248MPa, and tensile strength is
524MPa, elongation percentage is 29%, and 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 ferrum
With inevitable impurity.
Its technological process is: smelts → forges and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Technological parameter: continuous annealing temperature is 780 DEG C, with 30 DEG C/s and the fast quickly cooling of above rate of cooling after slow cooling to 690 DEG C
But, then at 290 DEG C of Wetted constructures.The cold-rolled biphase steel panel products yield strength obtained is 238MPa, and tensile strength is
522MPa, elongation percentage is 28%, and 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 be ferrum and
Inevitably impurity.
Its technological process is:
Smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Technological parameter:
Continuous annealing temperature is 760 DEG C, quickly cools down with 30 DEG C/s and above rate of cooling, then exist after slow cooling to 690 DEG C
290 DEG C of Wetted constructures.The cold-rolled biphase steel panel products yield strength obtained is 243MPa, and tensile strength is 497MPa, extends
Rate is 28%, and 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 be ferrum and
Inevitably impurity.
Its technological process is:
Smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Technological parameter:
Continuous annealing temperature is 780 DEG C, quickly cools down with 30 DEG C/s and above rate of cooling, then exist after slow cooling to 690 DEG C
290 DEG C of Wetted constructures.The cold-rolled biphase steel panel products yield strength obtained is 263MPa, and tensile strength is 521MPa, extends
Rate is 27%, and 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 that ferrum is with inevitable
Impurity.
Its technological process is:
Smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Technological parameter:
Continuous annealing temperature is 780 DEG C, quickly cools down with 30 DEG C/s and above rate of cooling, then exist after slow cooling to 700 DEG C
320 DEG C of Wetted constructures.The cold-rolled biphase steel panel products yield strength obtained is 260MPa, and tensile strength is 545MPa, extends
Rate is 28%, and 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 that ferrum is with inevitable
Impurity.
Its technological process is:
Smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Technological parameter:
Continuous annealing temperature is 800 DEG C, quickly cools down with 30 DEG C/s and above rate of cooling, then exist after slow cooling to 700 DEG C
320 DEG C of Wetted constructures.The cold-rolled biphase steel panel products yield strength obtained is 280MPa, and tensile strength is 550MPa, extends
Rate is 26%, and 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 that ferrum is with inevitable
Impurity.
Its technological process is:
Smelt → forge and hot rolling → pickling and cold-rolling → continuous annealing → finished product.
Technological parameter:
Continuous annealing temperature is 760 DEG C, quickly cools down with 30 DEG C/s and above rate of cooling, then exist after slow cooling to 700 DEG C
320 DEG C of Wetted constructures.The cold-rolled biphase steel panel products yield strength obtained is 275MPa, and tensile strength is 550MPa, extends
Rate is 27%, and n value is 0.20.
Use the automobile high-strength cold-rolled biphase steel plate that the chemical composition of the present invention, technological process and concrete grammar and step produce,
Yield strength is 220MPa～300MPa, and tensile strength is 490MPa～550MPa, and elongation percentage is 25%～30%.
Above the present invention is exemplarily described, it is clear that the present invention implements and is not subject to the restrictions described above, as long as adopting
The various improvement carried out with technical scheme are conceived by the method for the present invention, or the most improved that directly apply to other occasion, all
Within protection scope of the present invention.
Claims (6)
1. a steel plate, it is characterized in that, it is 500MPa level dual-phase 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%, and surplus is Fe and inevitable impurity；
The preparation method of described steel plate, comprises the steps:
(1) smelt；
(2) forging and hot rolling；
(3) pickling and cold-rolling；
(4) continuous annealing；
(5) finished product is obtained；
Its continuous annealing main technologic parameters is: after 760 DEG C or 780 DEG C insulation 120s, quickly cool down with 30 DEG C/s and above rate of cooling after slow cooling to 690 DEG C or 700 DEG C, then at 290～300 DEG C of Wetted constructures,
Described steel plate is automobile high-strength cold-rolled biphase steel plate, and yield strength is 220MPa～300MPa, and tensile strength is 490MPa～550MPa, and elongation percentage is 25%～30%.
2. a kind of steel plate as claimed in claim 1, it is characterised in that cold rolling reduction ratio controls 60～80%.
3. a kind of steel plate as claimed in claim 2, it is characterised in that steel plate composition according to mass percent is: C: 0.04%, Mn: 1.56%, Si: 0.26%, Cr: 0.35%；Technological parameter selects: continuous annealing temperature is 760 DEG C, slow cooling quickly cools down with 30 DEG C/s and above rate of cooling after 690 DEG C, then at 290 DEG C of Wetted constructures, the cold-rolled biphase steel panel products yield strength obtained is 248MPa, tensile strength is 524MPa, elongation percentage is 29%, and n value is 0.18.
4. a kind of steel plate as claimed in claim 2, it is characterised in that steel plate composition according to mass percent is: C: 0.04%, Mn: 1.56%, Si: 0.26%, Cr: 0.38%；Technological parameter selects: continuous annealing temperature is 780 DEG C, slow cooling quickly cools down with 30 DEG C/s and above rate of cooling after 690 DEG C, then at 290 DEG C of Wetted constructures, the cold-rolled biphase steel panel products yield strength obtained is 238MPa, tensile strength is 522MPa, elongation percentage is 28%, and n value is 0.19.
5. a kind of steel plate as claimed in claim 2, it is characterised in that steel plate composition according to mass percent is: C: 0.05%, Mn: 1.5%, Si: 0.25%, Cr: 0.20%；Technological parameter selects: continuous annealing temperature is 760 DEG C, slow cooling quickly cools down with 30 DEG C/s and above rate of cooling after 690 DEG C, then at 290 DEG C of Wetted constructures, the cold-rolled biphase steel panel products yield strength obtained is 243MPa, tensile strength is 497MPa, elongation percentage is 28%, and n value is 0.20.
6. a kind of steel plate as claimed in claim 2, it is characterised in that steel plate composition according to mass percent is: C: 0.05%, Mn: 1.5%, Si: 0.25%, Cr: 0.20%；Technological parameter selects: continuous annealing temperature is 780 DEG C, slow cooling quickly cools down with 30 DEG C/s and above rate of cooling after 690 DEG C, then at 290 DEG C of Wetted constructures, the cold-rolled biphase steel panel products yield strength obtained is 263MPa, tensile strength is 521MPa, elongation percentage is 27%, and n value is 0.19.
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| CN106987772B (en) * | 2017-04-28 | 2018-11-30 | 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 |
| CN111172466B (en) * | 2020-03-04 | 2020-12-18 | 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 |
| 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 |
| CN116288001B (en) * | 2023-03-07 | 2024-08-02 | 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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| JPS6176620A (en) * | 1984-09-21 | 1986-04-19 | Kobe Steel Ltd | Manufacture of composite structure type high strength cold rolled steel sheet |
| CN103320701B (en) * | 2012-03-23 | 2016-08-03 | 宝山钢铁股份有限公司 | A kind of ferrite-bainite AHSS plate and manufacture method thereof |
| CN102758131B (en) * | 2012-06-18 | 2014-08-20 | 河北钢铁股份有限公司邯郸分公司 | Production method of 600MPa grade cold rolling dual-phase steel |
| CN102839329B (en) * | 2012-08-06 | 2014-10-15 | 马钢(集团)控股有限公司 | Cold-rolling double-phase-steel steel plate with tensile strength of 450 MPa, and preparation method thereof |
| CN103305762A (en) * | 2013-06-21 | 2013-09-18 | 安徽工业大学 | Cold-rolled dual-phase sheet steel with 400MPa-level tensile strength and preparation method thereof |
| CN103469089B (en) * | 2013-09-11 | 2016-01-27 | 马鞍山市安工大工业技术研究院有限公司 | A kind of cheese crystal grain deep-draw dual phase sheet steel and preparation method thereof |
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