CN102321845A - A kind of high-strength hot-rolled dual-phase steel and method of manufacture thereof - Google Patents
A kind of high-strength hot-rolled dual-phase steel and method of manufacture thereof Download PDFInfo
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- CN102321845A CN102321845A CN 201110281556 CN201110281556A CN102321845A CN 102321845 A CN102321845 A CN 102321845A CN 201110281556 CN201110281556 CN 201110281556 CN 201110281556 A CN201110281556 A CN 201110281556A CN 102321845 A CN102321845 A CN 102321845A
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Abstract
The present invention relates to a kind of high-strength hot-rolled dual-phase steel and method of manufacture thereof.The chemical component weight per-cent of said high-strength hot-rolled dual-phase steel is: C:0.05%～0.10%, Si:0.015%～0.45%, Mn:0.4%～1.2%; P :≤0.012%; S :≤0.006%, Cr:0.3～0.6%, surplus is Fe and unavoidable impurities element.High-strength hot-rolled dual-phase steel of the present invention is the duplex structure on the martensite island that disperse is distributing tiny on the tiny ferrite matrix; Ys reaches 390MPa; Tensile strength reaches 670MPa, yield tensile ratio 0.58, unit elongation 27%; Strain-hardening index can satisfy the mechanical property requirements of the ferrito-martensite hot-rolled dual-phase steel of 590MPa level more than 0.15.
Description
Technical field
The present invention relates to a kind of dual phase steel and method of manufacture thereof, relate in particular to a kind of high-strength hot-rolled dual-phase steel and method of manufacture thereof.
Background technology
Along with Hyundai Motor develops to directions such as high security, economic environmental protection, high life, increasing requirement has been proposed for intensity, formability, the solidity to corrosion of auto sheet.For satisfying the requirement of development of automobile, with material competitions such as aluminium, magnesiumalloy, each big steel company of the world all is devoted to develop the high-strength vehicle plate simultaneously.Dual phase steel is to be applied in one of maximum advanced steel grade of high-strength vehicle plate at present because of its excellent mechanical property.
Dual phase steel is also claimed martensite dual-phase steel by ferritic and a small amount of (volume(tric)fraction < 20%) plow-steel that martensite is formed.Its main mechanical property characteristics are: 1) lower ys and advantages of higher tensile strength; 2) extensibility and homogeneous deformation preferably; 3) higher work hardening rate; 4) intensity and ductility coupling is good.Hot-rolled dual-phase steel is used for moving member and safety member owing to have above these advantages more, and like wheel, crossbeam, collision bumper etc., fatigue strength is its important using property data with the bump energy-absorbing.
Aspect the exploitation of high-strength vehicle steel plate, Japan and America and Europe maintain the leading position in the world.The NKK of Japan, Sumitomo Metal Industries etc. all Development and Production have gone out hot-rolled dual-phase steel.General and the Ford Motor Company research of the U.S. and the existing history for many years of use dual phase steel, with the passenger vehicle spoke that dual phase steel is made, except that weight saving 14%, be 2 times of plain carbon stool fatigue lifetime.States such as Germany, France, Italy, Britain, Sweden have also carried out R and D to dual phase steel, and in automobile industry, application are arranged all.
The research of China's hot rolling biphase plate originates in the eighties in 20th century, still is in trial production and popularization stage at present.Domestic iron and steel enterprises Baosteel, Wuhan Iron and Steel Plant have been developed high-strength dual phase steel series product, and have obtained impressive progress.
Summary of the invention
The present invention is directed to China's hot rolling biphase plate and still be in trial production at present and promote the deficiency in stage, a kind of high-strength hot-rolled dual-phase steel and method of manufacture thereof are provided.
The technical scheme that the present invention solves the problems of the technologies described above is following: a kind of chemical component weight per-cent of high-strength hot-rolled dual-phase steel is: C:0.05%～0.10%; Si:0.015%～0.45%; Mn:0.4%～1.2%, P :≤0.012%, S :≤0.006%; Cr:0.3～0.6%, surplus are Fe and unavoidable impurities element.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the gauge control of said dual phase steel is at 3mm～6mm.
The present invention also provides a kind of technical scheme that solves the problems of the technologies described above following: a kind of method of manufacture of high-strength hot-rolled dual-phase steel may further comprise the steps:
Step 10: the composition by above-mentioned high-strength hot-rolled dual-phase steel is smelted, and casts blank, with blank heating to 1200 ℃～1250 ℃, and after being incubated 1h～2h under this temperature, carries out roughing and finish rolling more successively;
Step 20: the employing of the steel plate after rolling is comprised first section water-cooled, water-cooled interval air cooling, second section water-cooled and the segmentation process for cooling that batches.
Further, the start rolling temperature of said roughing is controlled at 1050 ℃～1150 ℃.
Further, the start rolling temperature of said finish rolling is controlled at 930 ℃～960 ℃.
Further, said finishing temperature is controlled at 800 ℃～860 ℃, hot rolling attitude non-recrystallization district deflection>60%.
Further, said first section water-cooled is that cooling rate with 30 ℃/s～50 ℃/s is cooled to 600 ℃～700 ℃.
Further, the time of air cooling is 5s～10s to said water-cooled at interval.
Further, said second section water-cooled is that the cooling rate with 30 ℃/s～50 ℃/s is cooled to the temperature of batching, and said temperature of batching is controlled at below 200 ℃.
The invention has the beneficial effects as follows: high-strength hot-rolled dual-phase steel of the present invention is the duplex structure on the martensite island that disperse is distributing tiny on the tiny ferrite matrix; Ys reaches 370Mpa～410Mpa; Tensile strength reaches 670Mpa, yield tensile ratio 0.56～0.62, unit elongation 26%～28%; Strain-hardening index can satisfy the mechanical property requirements of the ferrito-martensite hot-rolled dual-phase steel of 590Mpa level more than 0.15; The present invention rolls back segmentation cooling and coiling technique through regulating hot-rolled steel plate, obtains to have the high-strength ferritic martensite dual-phase steel of different mechanical properties, makes cost reduce, and helps suitability for industrialized production.
Embodiment
Below principle of the present invention and characteristic are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
Embodiment 1
Rolling Production technology comprises heating, insulation, roughing, finish rolling, cools off, batches, and is specially:
(the chemical component weight per-cent of molten steel is: C:0.06%, Si:0.02%, Mn:1.05% with smelting good molten steel; P :≤0.0012%, S :≤0.006%, Cr:0.4%; Surplus is Fe and unavoidable impurities element), cast blank, with 1200 ℃ of blank heating to temperature; Insulation 1.5h is rolled.The roughing start rolling temperature is controlled at 1090 ℃, and the finish rolling start rolling temperature is controlled at 930 ℃, and finishing temperature is controlled at 800 ℃.Steel plate rolls after first section water-cooled is cooled to 700 ℃ with the cooling rate of 30 ℃/s, air cooling 5s, and after second section water-cooled with the cooling rate cooling of 50 ℃/s, reaches coiling temperature.
Coiling temperature is controlled at 150 ℃, and product thickness is controlled at 6.0mm.
Prepared product ys reaches 375Mpa, and tensile strength reaches 670Mpa, yield tensile ratio 0.56, breaking elongation 27%, strain-hardening index 0.16.
Embodiment 2
Rolling Production technology comprises heating, insulation, roughing, finish rolling, cools off, batches, and is specially:
(the chemical component weight per-cent of molten steel is: C:0.07%, Si:0.2%, Mn:0.5% with smelting good molten steel; P :≤0.0012%, S :≤0.006%, Cr:0.3%; Surplus is Fe and unavoidable impurities element), cast blank, with 1220 ℃ of blank heating to temperature; Insulation 2h is rolled.The roughing start rolling temperature is controlled at 1150 ℃, and the finish rolling start rolling temperature is controlled at 960 ℃, and finishing temperature is controlled at 820 ℃.Steel plate rolls after first section water-cooled is cooled to 640 ℃ with the cooling rate of 40 ℃/s, air cooling 10s, and after second section water-cooled with the cooling rate cooling of 50 ℃/s, reaches coiling temperature.
Coiling temperature is controlled at 100 ℃, and product thickness is controlled at 5.0mm.
Prepared product ys reaches 408Mpa, and tensile strength reaches 670Mpa, yield tensile ratio 0.61, breaking elongation 27.5%, strain-hardening index 0.15.
Embodiment 3
Rolling Production technology comprises heating, insulation, roughing, finish rolling, cools off, batches, and is specially:
(the chemical component weight per-cent of molten steel is: C:0.10%, Si:0.03%, Mn:0.8% with smelting good molten steel; P :≤0.0012%, S :≤0.006%, Cr:0.3%; Surplus is Fe and unavoidable impurities element), cast blank, with 1250 ℃ of blank heating to temperature; Insulation 1.5h is rolled.The roughing start rolling temperature is controlled at 1150 ℃, and the finish rolling start rolling temperature is controlled at 960 ℃, and finishing temperature is controlled at 860 ℃.Steel plate rolls after first section water-cooled is cooled to 620 ℃ with the cooling rate of 30 ℃/s, air cooling 8s, and after second section water-cooled with the cooling rate cooling of 50 ℃/s, reaches coiling temperature.
Coiling temperature is controlled at 80 ℃, and product thickness is controlled at 5.0mm.
Prepared product ys reaches 400Mpa, and tensile strength reaches 670Mpa, yield tensile ratio 0.58, breaking elongation 27%, strain-hardening index 0.15.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a high-strength hot-rolled dual-phase steel is characterized in that, its chemical component weight per-cent is: C:0.05%～0.10%; Si:0.015%～0.45%; Mn:0.4%～1.2%, P :≤0.012%, S :≤0.006%; Cr:0.3～0.6%, surplus are Fe and unavoidable impurities element.
2. high-strength hot-rolled dual-phase steel according to claim 1 is characterized in that the gauge control of said dual phase steel is at 3mm～6mm.
3. the method for manufacture of a high-strength hot-rolled dual-phase steel is characterized in that, may further comprise the steps:
Step 10: the composition by the described high-strength hot-rolled dual-phase steel of claim 1 is smelted, and casts blank, with blank heating to 1200 ℃～1250 ℃, and after being incubated 1h～2h under this temperature, carries out roughing and finish rolling more successively;
Step 20: the employing of the steel plate after rolling is comprised first section water-cooled, water-cooled interval air cooling, second section water-cooled and the segmentation process for cooling that batches.
4. the method for manufacture of high-strength hot-rolled dual-phase steel according to claim 3 is characterized in that, the start rolling temperature of said roughing is controlled at 1050 ℃～1150 ℃.
5. the method for manufacture of high-strength hot-rolled dual-phase steel according to claim 3 is characterized in that, the start rolling temperature of said finish rolling is controlled at 930 ℃～960 ℃.
6. the method for manufacture of high-strength hot-rolled dual-phase steel according to claim 3 is characterized in that, said finishing temperature is controlled at 800 ℃～860 ℃, hot rolling attitude non-recrystallization district deflection>60%.
7. the method for manufacture of high-strength hot-rolled dual-phase steel according to claim 3 is characterized in that, said first section water-cooled is that the cooling rate with 30 ℃/s～50 ℃/s is cooled to 600 ℃～700 ℃.
8. the method for manufacture of high-strength hot-rolled dual-phase steel according to claim 3 is characterized in that, the time of air cooling is 5s～10s to said water-cooled at interval.
9. the method for manufacture of high-strength hot-rolled dual-phase steel according to claim 3 is characterized in that, said second section water-cooled is that the cooling rate with 30 ℃/s～50 ℃/s is cooled to the temperature of batching, and said temperature of batching is controlled at below 200 ℃.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703815A (en) * | 2012-06-19 | 2012-10-03 | 东北大学 | 600 Mpa grade hot-rolling dual-phase steel and preparation method thereof |
| CN103981346A (en) * | 2013-02-07 | 2014-08-13 | 中国钢铁股份有限公司 | Method for manufacturing low-yield-ratio steel |
| CN104195439A (en) * | 2014-08-22 | 2014-12-10 | 东北大学 | Thick-specification hot-rolled dual-phase steel plate and manufacturing method thereof |
| WO2015043058A1 (en) * | 2013-09-26 | 2015-04-02 | 北大方正集团有限公司 | Production process for non-quenched and tempered steel |
| CN105385954A (en) * | 2015-12-09 | 2016-03-09 | 内蒙古包钢钢联股份有限公司 | 600-MPa dual-phase steel belt over 10 mm and machining method thereof |
| CN106086627A (en) * | 2016-07-27 | 2016-11-09 | 武汉钢铁股份有限公司 | A kind of 600MPa level hot-rolled dual-phase steel and production method thereof |
| CN107881430A (en) * | 2016-09-29 | 2018-04-06 | 上海梅山钢铁股份有限公司 | A kind of tensile strength 600MPa levels hot-rolled dual-phase steel and its manufacture method |
| CN108504958A (en) * | 2018-05-15 | 2018-09-07 | 首钢集团有限公司 | A kind of 690MPa grades of hot rolling think gauge low yield strength ratio automobile spoke steel and preparation method thereof |
| CN109161797A (en) * | 2018-09-06 | 2019-01-08 | 邯郸钢铁集团有限责任公司 | A kind of lightweight endurance hot rolling two-phase wheel steel and its production method |
| CN109402355A (en) * | 2018-12-29 | 2019-03-01 | 首钢集团有限公司 | A kind of 600MPa grades of hot rolling TRIP type dual phase steel and preparation method thereof |
| CN109772907A (en) * | 2019-01-22 | 2019-05-21 | 江苏飞达环保科技有限公司 | A kind of uniform cooling means improving steel yield strength |
| CN110614278A (en) * | 2019-10-25 | 2019-12-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of hot-rolled dual-phase steel |
| CN110760756A (en) * | 2019-11-27 | 2020-02-07 | 河钢股份有限公司邯郸分公司 | Thick DP 680-grade hot-rolled dual-phase steel and preparation method thereof |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703815A (en) * | 2012-06-19 | 2012-10-03 | 东北大学 | 600 Mpa grade hot-rolling dual-phase steel and preparation method thereof |
| CN103981346A (en) * | 2013-02-07 | 2014-08-13 | 中国钢铁股份有限公司 | Method for manufacturing low-yield-ratio steel |
| CN103981346B (en) * | 2013-02-07 | 2016-06-08 | 中国钢铁股份有限公司 | Method for manufacturing low-yield-ratio steel |
| WO2015043058A1 (en) * | 2013-09-26 | 2015-04-02 | 北大方正集团有限公司 | Production process for non-quenched and tempered steel |
| CN104195439A (en) * | 2014-08-22 | 2014-12-10 | 东北大学 | Thick-specification hot-rolled dual-phase steel plate and manufacturing method thereof |
| CN104195439B (en) * | 2014-08-22 | 2017-02-22 | 东北大学 | Thick-specification hot-rolled dual-phase steel plate and manufacturing method thereof |
| CN105385954A (en) * | 2015-12-09 | 2016-03-09 | 内蒙古包钢钢联股份有限公司 | 600-MPa dual-phase steel belt over 10 mm and machining method thereof |
| CN106086627A (en) * | 2016-07-27 | 2016-11-09 | 武汉钢铁股份有限公司 | A kind of 600MPa level hot-rolled dual-phase steel and production method thereof |
| CN107881430A (en) * | 2016-09-29 | 2018-04-06 | 上海梅山钢铁股份有限公司 | A kind of tensile strength 600MPa levels hot-rolled dual-phase steel and its manufacture method |
| CN108504958A (en) * | 2018-05-15 | 2018-09-07 | 首钢集团有限公司 | A kind of 690MPa grades of hot rolling think gauge low yield strength ratio automobile spoke steel and preparation method thereof |
| CN109161797A (en) * | 2018-09-06 | 2019-01-08 | 邯郸钢铁集团有限责任公司 | A kind of lightweight endurance hot rolling two-phase wheel steel and its production method |
| CN109402355A (en) * | 2018-12-29 | 2019-03-01 | 首钢集团有限公司 | A kind of 600MPa grades of hot rolling TRIP type dual phase steel and preparation method thereof |
| CN109402355B (en) * | 2018-12-29 | 2020-12-15 | 首钢集团有限公司 | 600 MPa-grade hot-rolled TRIP type dual-phase steel and preparation method thereof |
| CN109772907A (en) * | 2019-01-22 | 2019-05-21 | 江苏飞达环保科技有限公司 | A kind of uniform cooling means improving steel yield strength |
| CN110614278A (en) * | 2019-10-25 | 2019-12-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of hot-rolled dual-phase steel |
| CN110760756A (en) * | 2019-11-27 | 2020-02-07 | 河钢股份有限公司邯郸分公司 | Thick DP 680-grade hot-rolled dual-phase steel and preparation method thereof |
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Application publication date: 20120118 |