CN103668003B - A kind of preparation method of automotive frame hot-rolled steel - Google Patents
A kind of preparation method of automotive frame hot-rolled steel Download PDFInfo
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- CN103668003B CN103668003B CN201310615054.4A CN201310615054A CN103668003B CN 103668003 B CN103668003 B CN 103668003B CN 201310615054 A CN201310615054 A CN 201310615054A CN 103668003 B CN103668003 B CN 103668003B
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Abstract
The invention discloses a kind of preparation method of automotive frame hot-rolled steel, does is each chemical composition mass percent of this hot-rolled steel: C 0.05-0.1, Si 0.08-0.15, Mn 2.2-3.6, Ni 0.6-1.2, Mo 0.2-0.4, Ti 0.04-0.08, Als 0.03-0.05, V 0.02-0.03, W 0.04-0.08, Nb 0.015-0.025, Bi 0.02-0.03, Se 0.01-0.02, Pr 0.008-0.016, Er 0.014-0.022, P≤0.025, S ≤ 0.015, surplus is iron and inevitable impurity.Hot-rolled steel of the present invention has higher intensity and toughness and good welding property and cold-forming property, meet the requirement of auto vendor to beam steel, and technique is simply controlled, energy consumption is low, cost is low, be applicable to produce in enormous quantities, there are good DEVELOPMENT PROSPECT and potentiality.
Description
Technical field
The present invention relates to a kind of preparation method of automotive frame hot-rolled steel, belong to metal material processing and field shaping technique.
Background technology
Automotive frame hot-rolled steel is mainly used in the component such as longitudinal beam of automobile frame, crossbeam.Along with developing rapidly of Domestic Automotive Industry, according to the requirement of automotive light weight technology, require more and more higher to automotive frame over-all properties, not only require that there is good intensity, but also need good plasticity, toughness and excellent cold forming capability and welding property, but the hot-rolled steel on existing market cannot meet the requirements at the higher level of automobile making material, therefore, the automotive frame hot-rolled steel of a kind of excellent combination property of exploitation is badly in need of.
Summary of the invention
The object of the present invention is to provide the preparation method of the automotive frame hot-rolled steel of a kind of mechanical property, welding property and processing characteristics excellence.
For achieving the above object, the technical solution used in the present invention is as follows:
A preparation method for automotive frame hot-rolled steel, comprises the following steps
(1) smelt according to clean steel process, controlling molten steel finalization Ingredient percent is: C0.05-0.1, Si0.08-0.15, Mn2.2-3.6, Ni0.6-1.2, Mo0.2-0.4, Ti0.04-0.08, Als0.03-0.05, V0.02-0.03, W0.04-0.08, Nb0.015-0.025, Bi0.02-0.03, Se0.01-0.02, Pr0.008-0.016, Er0.014-0.022, P≤0.025, S≤0.015, and surplus is iron and inevitable impurity; Tapping temperature is 1620-1680 DEG C, and continuous casting becomes thickness to be the slab of 150-200mm;
(2) continuous casting steel billet is warming up to 420-480 DEG C with 180-240 DEG C/h, insulation 2-3h, 860-920 DEG C is warming up to again with 150-200 DEG C/h, insulation 1-2h, is then cooled to 620-660 DEG C with 100-150 DEG C/h, insulation 2-3h, 1240-1280 DEG C is warming up to again with 250-300 DEG C/h, insulation 3-4h, comes out of the stove, and is that the high pressure water of 15-20MPa is to the slab positive and negative water jet descaling 10-15s that comes out of the stove with pressure;
(3) slab after de-scaling is put into 0-3 DEG C of icy salt solution and be cooled to less than 50 DEG C, then 460-510 DEG C is warming up to 220-250 DEG C/h, insulation 3-5h, 780-940 DEG C is warming up to again with 160-220 DEG C/h, insulation 2-3h, then be warming up to 1150-1250 DEG C with 180-240 DEG C/h, insulation 1-2h, then be the continuous roughing carrying out 3-5 passage under the condition of 4-6m/s in roll speed, being hot-rolled down to thickness is 30-40mm;
(4) board briquette after roughing is down to 950-1050 DEG C, and be the continuous finish rolling carrying out 2-4 passage under the condition of 5-8m/s in roll speed, being hot-rolled down to thickness is 10-15mm;
(5) board briquette after finish rolling is down to 820-860 DEG C, is to carry out finish to gauge under the condition of 3-4m/s in roll speed, and being hot-rolled down to thickness is 5-8mm;
(6) the finish to gauge steel plate of gained is cooled to 700-740 DEG C with the speed of cooling of 25-35 DEG C/s, then is cooled to 550-580 DEG C with the speed of cooling of 10-20 DEG C/s, smooth bundling, air cooling, to room temperature, gets product.
Beneficial effect of the present invention:
Hot-rolled steel of the present invention has higher intensity and toughness and good welding property and cold-forming property, yield strength >=520MPa, tensile strength >=650MPa, elongation >=32%, low-temperature impact work-40 DEG C >=90J, meets the requirement of auto vendor to beam steel, and technique is simply controlled, energy consumption is low, cost is low, is applicable to produce in enormous quantities, has good DEVELOPMENT PROSPECT and potentiality.
Embodiment
A preparation method for automotive frame hot-rolled steel, comprises the following steps
(1) smelt according to clean steel process, controlling molten steel finalization Ingredient percent is: C0.05-0.1, Si0.08-0.15, Mn2.2-3.6, Ni0.6-1.2, Mo0.2-0.4, Ti0.04-0.08, Als0.03-0.05, V0.02-0.03, W0.04-0.08, Nb0.015-0.025, Bi0.02-0.03, Se0.01-0.02, Pr0.008-0.016, Er0.014-0.022, P≤0.025, S≤0.015, and surplus is iron and inevitable impurity; Tapping temperature is 1650 DEG C, and continuous casting becomes thickness to be the slab of 200mm;
(2) continuous casting steel billet is warming up to 460 DEG C with 220 DEG C/h, insulation 2h, 880 DEG C are warming up to again with 180 DEG C/h, insulation 1.5h, is then cooled to 630 DEG C with 120 DEG C/h, insulation 3h, 1260 DEG C are warming up to again with 280 DEG C/h, insulation 3h, comes out of the stove, and is that the high pressure water of 18MPa is to the slab positive and negative water jet descaling 10s that comes out of the stove with pressure;
(3) slab after de-scaling is put into 2 DEG C of icy salt solutions and be cooled to less than 50 DEG C, then 490 DEG C are warming up to 240 DEG C/h, insulation 4h, 920 DEG C are warming up to again with 200 DEG C/h, insulation 2h, then be warming up to 1180 DEG C with 220 DEG C/h, insulation 2h, then be the continuous roughing carrying out 4 passages under the condition of 5m/s in roll speed, being hot-rolled down to thickness is 35mm;
(4) board briquette after roughing is down to 1020 DEG C, and be the continuous finish rolling carrying out 3 passages under the condition of 7m/s in roll speed, being hot-rolled down to thickness is 10mm;
(5) board briquette after finish rolling is down to 840 DEG C, is to carry out finish to gauge under the condition of 4m/s in roll speed, and being hot-rolled down to thickness is 6mm;
(6) the finish to gauge steel plate of gained is cooled to 720 DEG C with the speed of cooling of 30 DEG C/s, then is cooled to 560 DEG C with the speed of cooling of 15 DEG C/s, smooth bundling, air cooling, to room temperature, gets product.
Through inspection, chemical composition is: C0.072%, Si0.095%, Mn2.83%, Ni0.86%, Mo0.33%, Ti0.058%, Als0.046%, V0.024%, W0.061%, Nb0.018%, Bi0.021%, Se0.016%, Pr0.0088%, Er0.019%, P0.012%, S0.008%, and surplus is iron and inevitable impurity; Mechanical property is: tensile strength 698MPa, yield strength 564MPa, elongation 33.5% ,-40 DEG C of low-temperature impact work 102J.
Claims (1)
1. a preparation method for automotive frame hot-rolled steel, is characterized in that comprising the following steps
(1) smelt according to clean steel process, controlling molten steel finalization Ingredient percent is: C0.05-0.1, Si0.08-0.15, Mn2.2-3.6, Ni0.6-1.2, Mo0.2-0.4, Ti0.04-0.08, Als0.03-0.05, V0.02-0.03, W0.04-0.08, Nb0.015-0.025, Bi0.02-0.03, Se0.01-0.02, Pr0.008-0.016, Er0.014-0.022, P≤0.025, S≤0.015, and surplus is iron and inevitable impurity; Tapping temperature is 1620-1680 DEG C, and continuous casting becomes thickness to be the slab of 150-200mm;
(2) continuous casting steel billet is warming up to 420-480 DEG C with 180-240 DEG C/h, insulation 2-3h, 860-920 DEG C is warming up to again with 150-200 DEG C/h, insulation 1-2h, is then cooled to 620-660 DEG C with 100-150 DEG C/h, insulation 2-3h, 1240-1280 DEG C is warming up to again with 250-300 DEG C/h, insulation 3-4h, comes out of the stove, and is that the high pressure water of 15-20MPa is to the slab positive and negative water jet descaling 10-15s that comes out of the stove with pressure;
(3) slab after de-scaling is put into 0-3 DEG C of icy salt solution and be cooled to less than 50 DEG C, then 460-510 DEG C is warming up to 220-250 DEG C/h, insulation 3-5h, 780-940 DEG C is warming up to again with 160-220 DEG C/h, insulation 2-3h, then be warming up to 1150-1250 DEG C with 180-240 DEG C/h, insulation 1-2h, then be the continuous roughing carrying out 3-5 passage under the condition of 4-6m/s in roll speed, being hot-rolled down to thickness is 30-40mm;
(4) board briquette after roughing is down to 950-1050 DEG C, and be the continuous finish rolling carrying out 2-4 passage under the condition of 5-8m/s in roll speed, being hot-rolled down to thickness is 10-15mm;
(5) board briquette after finish rolling is down to 820-860 DEG C, is to carry out finish to gauge under the condition of 3-4m/s in roll speed, and being hot-rolled down to thickness is 5-8mm;
(6) the finish to gauge steel plate of gained is cooled to 700-740 DEG C with the speed of cooling of 25-35 DEG C/s, then is cooled to 550-580 DEG C with the speed of cooling of 10-20 DEG C/s, smooth bundling, air cooling, to room temperature, gets product.
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| CN201310615054.4A CN103668003B (en) | 2013-11-28 | 2013-11-28 | A kind of preparation method of automotive frame hot-rolled steel |
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| CN201310615054.4A CN103668003B (en) | 2013-11-28 | 2013-11-28 | A kind of preparation method of automotive frame hot-rolled steel |
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| CN103668003B true CN103668003B (en) | 2016-03-09 |
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| CN103866189B (en) * | 2014-03-31 | 2016-01-20 | 武汉钢铁(集团)公司 | Low fragility 800MPa level steel for automobile crossbeam and manufacture method thereof |
| CN106636964A (en) * | 2016-12-15 | 2017-05-10 | 苏州富艾姆工业设备有限公司 | Automobile frame and preparation process thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586211A (en) * | 2009-07-08 | 2009-11-25 | 攀钢集团研究院有限公司 | Hot-rolled steel sheet containing niobium steel and producing method thereof |
| CN101724778A (en) * | 2008-10-27 | 2010-06-09 | 上海梅山钢铁股份有限公司 | Steel for automobile beam and with yield strength more than 500 MPa and manufacturing method thereof |
| CN101920278A (en) * | 2009-06-17 | 2010-12-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for hot-rolled steel plates for automobiles |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101724778A (en) * | 2008-10-27 | 2010-06-09 | 上海梅山钢铁股份有限公司 | Steel for automobile beam and with yield strength more than 500 MPa and manufacturing method thereof |
| CN101920278A (en) * | 2009-06-17 | 2010-12-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for hot-rolled steel plates for automobiles |
| CN101586211A (en) * | 2009-07-08 | 2009-11-25 | 攀钢集团研究院有限公司 | Hot-rolled steel sheet containing niobium steel and producing method thereof |
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