CN100529142C - Hot-rolled steel sheet for automobile and producing method thereof - Google Patents
Hot-rolled steel sheet for automobile and producing method thereof Download PDFInfo
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- CN100529142C CN100529142C CNB2007100487671A CN200710048767A CN100529142C CN 100529142 C CN100529142 C CN 100529142C CN B2007100487671 A CNB2007100487671 A CN B2007100487671A CN 200710048767 A CN200710048767 A CN 200710048767A CN 100529142 C CN100529142 C CN 100529142C
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Abstract
This invention provides a hot-rolled armor plate used in car-beams composed of the following chemical composition in weight percentage: C: 0.07-0.12%, Si: 0.15-0.30%, Mn: 1.05-1.25%, V: 0.06-0.10%, P smaller than or equal to 0.025% and S smaller than or equal to 0.015%, which has the advantages of finish surface, stable dynamic performance, small anisotropy, fine match of obdurability and excellent molding performance.
Description
Technical field
The present invention relates to hot-rolled steel sheet and production method thereof, particularly relate to a kind of hot-rolled steel sheet for automobile and production method thereof.
Background technology
The working conditions of hot-rolled steel sheet for automobile is very strict, not only requires to have good intensity, toughness, plasticity, and is because automobile frame (as crossbeam, longeron) becomes appearance component by original inner part, also more and more higher to the requirement of its surface quality simultaneously.
At present, mainly contain two kinds of hot-rolled steel sheet for automobile, a kind of is to adopt Nb-microalloying to produce hot-rolled steel sheet for automobile, but this method must strictly adopt production technique under controlled rolling and controlled cooling and the low temperature normal atmosphere, simultaneously production unit is had higher requirement; Another kind is to adopt vanadium micro-alloying to produce hot-rolled steel sheet for automobile, but this steel plate in use, has " piebald " defective, and the mechanical property fluctuation is big, intensity is higher, unit elongation is on the low side, punching press is easy to crack.
Summary of the invention
Technical problem to be solved by this invention provides a kind of have any surface finish, stable mechanical property, little, little with the volume poor performance, the good hot-rolled steel sheet for automobile that reaches advantages such as processability excellence of obdurability coupling of anisotropy.
The present invention also will provide a kind of production method of above-mentioned hot-rolled steel sheet for automobile, and this method need not produced under the low temperature normal atmosphere.
The technical scheme that technical solution problem of the present invention is adopted is: hot-rolled steel sheet for automobile, its chemical ingredients consists of by weight percentage: C:0.07～0.12%, Si:0.15～0.30%, Mn:1.05～1.25%, V:0.06～0.10%, P≤0.025%, S≤0.015%.
The production method of hot-rolled steel sheet for automobile may further comprise the steps: 1) during converter smelting, it is 0.15～0.30% that control Fe-Si add-on makes the weight percent content of silicon; 2) during converter smelting, it is 1.05～1.25% that control Fe-Mn add-on makes the weight percent content of manganese; 3) continuous casting steel billet is heated to 1220～1250 ℃; 4) intermediate slab thickness is 30～36mm after the roughing, carries out hot rolling; 5) the finish rolling start rolling temperature is 950～1050 ℃; 6) finishing temperature is 850～890 ℃; 7) rolling the back average cooling rate is 10.5～25.0 ℃/s; 8) coiling temperature is 595～675 ℃.
The invention has the beneficial effects as follows: the hot-rolled steel sheet for automobile that adopts the inventive method to produce has any surface finish, stable mechanical property, anisotropy is little, poor performance is little with rolling up, obdurability mates characteristics such as good and processability excellence.
Embodiment
Production Flow Chart of the present invention is: hot metal pretreatment → converter → external refining → cast → heating → roughing → hot rolling → finish rolling → cool off → batch.The present invention reduces silicone content by control Fe-Si add-on, to improve the surface quality of steel plate; Improve manganese content by control Fe-Mn add-on, to guarantee the intensity of steel plate; By reducing the technical measures such as temperature of hot continuous rolling process, with the surface quality of control steel plate; Determine the mechanical property of technical measures control steel plates such as the coiling temperature and the laminar flow type of cooling according to finished product thickness and carbon equivalent.
The present invention adopts the micro alloying element of vanadium as hot-rolled steel sheet for automobile, and continuous casting becomes slab.
In the hot continuous rolling process, it is carried out controlled rolling and controlled cooling; Slab is heated to 1220～1250 ℃; Intermediate slab thickness carries out hot rolling at 30～36mm after the roughing; The finish rolling start rolling temperature is at 950～1050 ℃; Finishing temperature is at 850～890 ℃; Rolling the back is cooled in 595～675 ℃ the coiling temperature scope from 850～890 ℃ with the average cooling rate of 10.5～25.0 ℃/s according to finished product thickness and carbon equivalent.
Be 16 embodiment of the present invention below: the continuous casting steel billet of employing 200 * (750-1300) * 11000mm is delivered to the 1450mm hot continuous mill and is rolled.
Table 1 is the chemical ingredients of the slab of 16 embodiment of the present invention, each numerical value all is weight percentage in the table, table 2 is the technology controlling and process values in the operation of rolling, table 3 is mechanical properties of coiled sheet, table 4 is anisotropy differences of different thickness coiled sheet, and table 5 is same volume poor mechanical property of different thickness coiled sheet.As seen, little, little, good, any surface finish of obdurability coupling of coiled sheet stable mechanical property, the anisotropy of steel plate of the present invention with the volume poor performance.
| Embodiment | C | Si | Mn | P | S | V | Embodiment | C | Si | Mn | P | S | V |
| 1 | 0.09 | 0.22 | 1.22 | 0.015 | 0.012 | 0.08 | 9 | 0.08 | 0.19 | 1.17 | 0.018 | 0.009 | 0.08 |
| 2 | 0.08 | 0.19 | 1.24 | 0.011 | 0.012 | 0.08 | 10 | 0.10 | 0.21 | 1.12 | 0.009 | 0.100 | 0.07 |
| 3 | 0.09 | 0.30 | 1.12 | 0.016 | 0.010 | 0.07 | 11 | 0.07 | 0.26 | 1.25 | 0.014 | 0.015 | 0.10 |
| 4 | 0.08 | 0.20 | 1.13 | 0.020 | 0.008 | 0.08 | 12 | 0.08 | 0.20 | 1.19 | 0.017 | 0.008 | 0.08 |
| 5 | 0.12 | 0.15 | 1.05 | 0.018 | 0.013 | 0.06 | 13 | 0.10 | 0.24 | 1.15 | 0.017 | 0.010 | 0.08 |
| 6 | 0.10 | 0.25 | 1.15 | 0.015 | 0.008 | 0.07 | 14 | 0.11 | 0.25 | 1.16 | 0.017 | 0.009 | 0.07 |
| 7 | 0.08 | 0.24 | 1.20 | 0.016 | 0.011 | 0.08 | 15 | 0.08 | 0.28 | 1.23 | 0.021 | 0.007 | 0.08 |
| 8 | 0.09 | 0.18 | 1.18 | 0.017 | 0.008 | 0.09 | 16 | 0.09 | 0.25 | 1.13 | 0.010 | 0.100 | 0.09 |
Table 1
| Embodiment | Tapping temperature ℃ | Intermediate slab thickness mm | Start rolling temperature ℃ | Finishing temperature ℃ | Coiling temperature ℃ | Rolling thickness mm | Embodiment | Tapping temperature ℃ | Intermediate slab thickness mm | Start rolling temperature ℃ | Finishing temperature ℃ | Coiling temperature ℃ | Rolling thickness mm |
| 1 | 1229 | 31 | 1021 | 884 | 646 | 3 | 9 | 1240 | 33 | 1023 | 864 | 631 | 7 |
| 2 | 1250 | 30 | 1019 | 870 | 654 | 3 | 10 | 1238 | 34 | 1018 | 880 | 625 | 7 |
| 3 | 1246 | 31 | 1005 | 874 | 650 | 4 | 11 | 1207 | 34 | 1022 | 893 | 623 | 8 |
| 4 | 1243 | 31 | 1013 | 875 | 648 | 4 | 12 | 1220 | 34 | 1026 | 878 | 628 | 8 |
| 5 | 1234 | 32 | 1009 | 865 | 644 | 5 | 13 | 1239 | 33 | 997 | 860 | 620 | 9 |
| 6 | 1242 | 33 | 1008 | 874 | 658 | 5 | 14 | 1242 | 34 | 990 | 865 | 630 | 9 |
| 7 | 1244 | 33 | 1037 | 886 | 648 | 6 | 15 | 1241 | 34 | 1013 | 870 | 610 | 10 |
| 8 | 1232 | 34 | 1019 | 887 | 632 | 6 | 16 | 1233 | 35 | 1016 | 872 | 608 | 10 |
Table 2
| Embodiment | Yield strength (Rel) Mpa | Tensile strength (Rm) Mpa | Unit elongation (A) % | Clod wash B=35mm, α=180 ° d=a | Embodiment | Yield strength (Rel) Mpa | Tensile strength (Rm) Mpa | Unit elongation (A) % | Clod wash B=35mm, α=180 ° d=a |
| 1 | 490 | 570 | 32 | Intact | 9 | 445 | 535 | 30 | Intact |
| 2 | 490 | 570 | 33 | Intact | 10 | 450 | 545 | 30 | Intact |
| 3 | 455 | 555 | 33 | Intact | 11 | 425 | 530 | 29 | Intact |
| 4 | 445 | 530 | 30 | Intact | 12 | 440 | 530 | 36 | Intact |
| 5 | 455 | 550 | 33 | Intact | 13 | 430 | 525 | 29 | Intact |
| 6 | 460 | 550 | 31 | Intact | 14 | 430 | 530 | 29 | Intact |
| 7 | 450 | 540 | 29 | Intact | 15 | 430 | 530 | 37 | Intact |
| 8 | 440 | 550 | 28 | Intact | 16 | 445 | 550 | 29 | Intact |
Table 3
| Embodiment | Thickness mm | ΔRel MPa | ΔRm MPa | ΔA ％ |
| 4 | 4.0 | ≤5 | ≤15 | ≤1.0 |
| 6 | 5.0 | ≤15 | ≤10 | ≤2.0 |
| 8 | 6.0 | ≤5 | ≤15 | ≤2.0 |
| 12 | 8.0 | ≤10 | ≤15 | ≤1.5 |
| 16 | 10.0 | ≤15 | ≤5 | ≤1.5 |
Table 4
| Embodiment | Thickness mm | ΔRel MPa | ΔRm MPa | ΔA ％ |
| 4 | 4.0 | ≤10 | ≤5 | ≤0.5 |
| 6 | 5.0 | ≤15 | ≤20 | ≤2.0 |
| 8 | 6.0 | ≤10 | ≤10 | ≤1.5 |
| 12 | 8.0 | ≤20 | ≤10 | ≤2.0 |
| 16 | 10.0 | ≤15 | ≤10 | ≤1.5 |
Table 5
Claims (3)
1, hot-rolled steel sheet for automobile is characterized in that, its chemical ingredients consists of by weight percentage: C:0.07～0.12%, Si:0.15～0.30%, Mn:1.05～1.25%, V:0.06～0.10%, P≤0.025%, S≤0.015%.
2, hot-rolled steel sheet for automobile as claimed in claim 1, it is characterized in that its chemical ingredients consists of by weight percentage: C:0.08～0.10%, Si:0.15～0.30%, Mn:1.10～1.20%, V:0.06～0.10%, P≤0.025%, S≤0.015%.
3, the production method of the described hot-rolled steel sheet for automobile of claim 1 is characterized in that, may further comprise the steps:
1) during converter smelting, it is 0.15～0.30% that control Fe-Si add-on makes the weight percent content of silicon;
2) during converter smelting, it is 1.05～1.25% that control Fe-Mn add-on makes the weight percent content of manganese;
3) continuous casting steel billet is heated to 1220～1250 ℃;
4) intermediate slab thickness is 30～36mm after the roughing, carries out hot rolling;
5) the finish rolling start rolling temperature is 950～1050 ℃;
6) finishing temperature is 850～890 ℃;
7) rolling the back average cooling rate is 10.5～25.0 ℃/s;
8) coiling temperature is 595～675 ℃.
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| CNB2007100487671A CN100529142C (en) | 2007-03-29 | 2007-03-29 | Hot-rolled steel sheet for automobile and producing method thereof |
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| CN101033523A CN101033523A (en) | 2007-09-12 |
| CN100529142C true CN100529142C (en) | 2009-08-19 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100519808C (en) * | 2007-12-05 | 2009-07-29 | 攀钢集团攀枝花钢铁研究院 | Vanadium-containing hot rolled steel plate and preparation method thereof |
| CN101509102B (en) * | 2009-03-27 | 2011-01-05 | 攀钢集团研究院有限公司 | Steel for hot-rolled low carbon punching and producing method thereof |
| RU2508411C2 (en) * | 2009-07-17 | 2014-02-27 | Ниппон Стил Корпорейшн | Production method of grain-oriented magnetic plate steel |
| CN101886221B (en) * | 2010-07-16 | 2012-03-21 | 攀钢集团钢铁钒钛股份有限公司 | Micro-alloy ultra-fine grained hot rolled steel plate and production method thereof |
| CN102989785B (en) * | 2012-12-17 | 2015-01-14 | 济钢集团有限公司 | Process for controlling surface piebaldness of steel plates |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151913A (en) * | 1996-08-29 | 1997-06-18 | 攀枝花钢铁（集团）公司钢铁研究院 | Prodn of steel plate for automobile girder |
| CN1609254A (en) * | 2003-10-21 | 2005-04-27 | 酒泉钢铁(集团)有限责任公司 | Micro alloyed steel and application thereof |
| CN1824816A (en) * | 2005-02-25 | 2006-08-30 | 宝钢集团上海梅山有限公司 | Steel for extended automobile crossbeam and mfg, method thereof |
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2007
- 2007-03-29 CN CNB2007100487671A patent/CN100529142C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151913A (en) * | 1996-08-29 | 1997-06-18 | 攀枝花钢铁（集团）公司钢铁研究院 | Prodn of steel plate for automobile girder |
| CN1609254A (en) * | 2003-10-21 | 2005-04-27 | 酒泉钢铁(集团)有限责任公司 | Micro alloyed steel and application thereof |
| CN1824816A (en) * | 2005-02-25 | 2006-08-30 | 宝钢集团上海梅山有限公司 | Steel for extended automobile crossbeam and mfg, method thereof |
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Owner name: PANGANG GROUP CO., LTD. Free format text: FORMER NAME: PANZHIHUA STEEL (GROUP) CO., LTD. |
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Address after: 617000 science and Technology Department, Pangang village, Xiangyang Village, East District, Panzhihua, Sichuan Patentee after: Pangang Group Co., Ltd. Address before: 617000 science and Technology Department, Pangang village, Xiangyang Village, East District, Panzhihua, Sichuan Patentee before: Panzhihua Iron and Steel (Group) Co., Ltd. |