CN1970813A - Process for production of hot-rolled dual phase steel by continuous casting and continuous rolling of slab billet - Google Patents
Process for production of hot-rolled dual phase steel by continuous casting and continuous rolling of slab billet Download PDFInfo
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- CN1970813A CN1970813A CN 200610098392 CN200610098392A CN1970813A CN 1970813 A CN1970813 A CN 1970813A CN 200610098392 CN200610098392 CN 200610098392 CN 200610098392 A CN200610098392 A CN 200610098392A CN 1970813 A CN1970813 A CN 1970813A
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Abstract
The invention discloses a manufacturing method of heat-rolling double-phase steel through continuous casting method of thin board blank, which comprises the following steps: smelting in the rotary furnace; refining in the LF furnace; casting thin board continuously. The smolten steel comprises the following parts: 0-0.075% C, 0.6-1.0% S, 1.5-2.0% Mn, 0.4-0.6% Cr, 0.010-0.080% Als,0.02-0.14% V and Fe and impurity.
Description
Technical field:
The invention belongs to this technical field of production technique of CSP steel, especially belonging to production intensity is this technical field of production technique of the hot-rolled dual-phase steel of 500～800MPa.
Background technology:
Hot-rolled dual-phase steel is a kind of novel automobile steel, and its microstructure mainly is made up of ferrite (F), martensite (M), and dual phase steel has high strength to cooperate with the optimization of good plasticity, has carried out a large amount of research work around this field both at home and abroad.CSP is made one of novel process as Iron And Steel Industry strip series products, and CSP line of the same type does not still have the precedent of succeeding in developing hot-rolled dual-phase steel both at home and abroad.
Summary of the invention:
Technical problem to be solved by this invention provides the technology that a kind of CSP is produced hot-rolled dual-phase steel.
The technical scheme of technical solution problem of the present invention is the technology that CSP is produced hot-rolled dual-phase steel, comprises the converter smelting operation, LF stove refining procedure, and the sheet blank continuous casting operation, the weight percent composition of its molten steel is: C:0-0.075%; Si:0.6-1.0%; Mn:1.5-2.0%; Cr:0.4-0.6%; Als:0.010-0.060; V:0.02-0.14%; All the other are Fe and impurity element.
In the sheet blank continuous casting operation, the rolling temperature system is: 1050～1150 ℃ of soaking temperatures; Finishing temperature: 820～900 ℃; Coiling temperature: 400～500 ℃;
In the sheet blank continuous casting operation, adopt 7 frame hot rollings, draft is F1:40～50% relatively; F2～F3:20～45%; F4～F5:15～35%; F6～F7:10～18%;
In the sheet blank continuous casting operation, adopt the multi-stage type controlled chilling, at first be cooled fast to 720～760 ℃ by finishing temperature; Air cooling 2～8s is as cold as 400-500 ℃ then soon.
The microstructure of the hot rolling biphase plate that the present invention produces is based on ferrite+martensite (or bainite), also may contain tissues such as a small amount of perlite simultaneously.
The composition of steel is on the basis of low C steel among the present invention, and adopting Si-Mn-Cr is alloying, has added a spot of V simultaneously.The reduction of C content can be avoided the peritectic steel scope, guarantees the stability of sheet blank continuous casting; Critical transition temperature when Si improves steel reheat and cooling, in hypoeutectoid steel, with increasing of silicone content, the critical cooling velocity of steel constantly reduces continuously, and supercooled austenite stability increases, thus the hardening capacity of steel improves.Mn postpones perlitic transformation, can improve hardening capacity, plays the effect of solution strengthening and refinement ferrite crystal grain; Mn reduces A simultaneously
3, A
1Stagnation point when postponing perlitic transformation, is also postponed ferritic transformation; Cr is the element of stable austenite, postpones perlite and ferritic transformation strongly.Especially the mesophilic range stabilization is more strong.V element matches with the control cooling control technology, forms carbon, nitride in steel, and the tiny particle of these precipitates can the pinning crystal boundary, has the effect of strong obstruction grain growth.
The present invention only need be by the mentioned component scope, and smelting and continuous casting can be realized on converter-LF refining-sheet blank continuous casting equipment; Can on general strip hot continuous rolling unit, adopt the cooperation of reduction system, temperature schedule and the cooling system of above special use simultaneously, can produce vehicle structure and roll up with hot-rolled dual-phase steel.Make the dual phase steel performance index be: σ
s(σ
P0.2) 〉=330MPa; σ
b〉=600MPa; σ
s/ σ
b(σ
P0.2)≤0.60; δ
5〉=22%.
The present invention is compared with prior art: the hot-rolled dual-phase steel of production, have advantages such as intensity height, forming property are good, wear-resistant, and automobile structure processing lumber recovery can be improved, and its work-ing life can be improved.
Embodiment:
Working condition is 120 tons of converter smeltings, through ladle argon-blown and the refining of LF stove, enters sheet blank continuous casting, and hot rolled strip thickness specification is 4～8mm.
The model of used thinslab casting is CSP.
The dual phase steel method for testing performance is GB228;
Embodiment 1: with blank process converter smelting operation, and LF stove refining procedure, the weight item of control molten steel is C:0.066%; Si:0.81%; Mn:1.66%; P:0.014%; S:0.0076%; Cr:0.53%; Als:0.040%; V:0.051%, be heated to 1150 ℃ by continuous tunnel furnace after, it is rolling to enter 7 frame tandem rolling units, 1050 ℃ of start rolling temperatures; 870 ℃ of finishing temperatures, the relative draft 45% of the 1st frame; The relative draft 15% of relative draft 35%, the 4～5 frame of the 2nd～3 frame; The relative draft 10% of the 6th～7 frame.Be cooled fast to 700 ℃ after rolling; Naturally cooling 2s batches after being as cold as 400 ℃ soon then, and the belt steel thickness of being produced is 5mm.
Embodiment 2: with blank process converter smelting operation, and LF stove refining procedure, the weight item of control molten steel is C:0.058%; Si:0.78%; Mn:1.59%; P:0.012%; S:0.0054; Cr:0.49%; Als:0.037%; V:0.049%, be heated to 1150 ℃ by continuous tunnel furnace after, it is rolling to enter 7 frame tandem rolling units, 1050 ℃ of start rolling temperatures; 800 ℃ of finishing temperatures, the relative draft 47% of the 1st frame; The relative draft 18% of relative draft 36%, the 4～5 frame of the 2nd～3 frame; The relative draft 15% of the 6th～7 frame.Be cooled fast to 705 ℃ after rolling; Naturally cooling 3s is as cold as 410 ℃ then soon and batches, and the belt steel thickness of being produced is 5mm.
Embodiment 3: with blank process converter smelting operation, and LF stove refining procedure, the weight item of control molten steel is C:0.057%; Si:0.82%; Mn:1.61%; P:0.009%; S:0.0065; Cr:0.51%; Als:0.041%; V:0.051%, be heated to 1150 ℃ by continuous tunnel furnace after, it is rolling to enter 7 frame tandem rolling units, 1050 ℃ of start rolling temperatures; 820 ℃ of finishing temperatures, the relative draft 48% of the 1st frame; The relative draft 20% of relative draft 37%, the 4～5 frame of the 2nd～3 frame; The relative draft 18% of the 6th～7 frame.Be cooled fast to 710 ℃ after rolling; Naturally cooling 4s is as cold as 420 ℃ then soon and batches, and the belt steel thickness of being produced is 5mm.
Embodiment 4: with blank process converter smelting operation, and LF stove refining procedure, the weight item of control molten steel is C:0.049%; Si:0.80%; Mn:1.56%; P:0.012%; S:0.0051; Cr:0.46%; Als:0.033%; V:0.055%, be heated to 1150 ℃ by continuous tunnel furnace after, it is rolling to enter 7 frame tandem rolling units, 1050 ℃ of start rolling temperatures; 830 ℃ of finishing temperatures, the relative draft 45% of the 1st frame; The relative draft 22% of relative draft 40%, the 4～5 frame of the 2nd～3 frame; The relative draft 20% of the 6th～7 frame.Be cooled fast to 720 ℃ after rolling; Naturally cooling 5s is as cold as 430 ℃ then soon and batches, and the belt steel thickness of being produced is 5mm.
Embodiment 5: with blank process converter smelting operation, and LF stove refining procedure, the weight item of control molten steel is C:0.043%; Si:0.83%; Mn:1.54%; P:0.011%; S:0.0062; Cr:0.48%; Als:0.037%; V:0.057%, be heated to 1150 ℃ by continuous tunnel furnace after, it is rolling to enter 7 frame tandem rolling units, 1080 ℃ of start rolling temperatures; 850 ℃ of finishing temperatures, the relative draft 47% of the 1st frame; The relative draft 30% of relative draft 42%, the 4～5 frame of the 2nd～3 frame; The relative draft 22% of the 6th～7 frame.Be cooled fast to 730 ℃ after rolling; Naturally cooling 6s is as cold as 450 ℃ then soon and batches, and the belt steel thickness of being produced is 5mm.
Embodiment 6: with blank process converter smelting operation, and LF stove refining procedure, the weight item of control molten steel is C:0.056%; Si:0.79%; Mn:1.61%; P:0.011%; S:0.0049; Cr:0.52%; Als:0.044%; V:0.061%, be heated to 1150 ℃ by continuous tunnel furnace after, it is rolling to enter 7 frame tandem rolling units, 1060 ℃ of start rolling temperatures; 870 ℃ of finishing temperatures, the relative draft 48% of the 1st frame; The relative draft 35% of relative draft 43%, the 4～5 frame of the 2nd～3 frame; The relative draft 28% of the 6th～7 frame.Be cooled fast to 740 ℃ after rolling; Naturally cooling 7s is as cold as 480 ℃ then soon and batches, and the belt steel thickness of being produced is 5mm.
Embodiment 7: with blank process converter smelting operation, and LF stove refining procedure, the weight item of control molten steel is C:0.046%; Si:0.72%; Mn:1.53%; P:0.010%; S:0.0054; Cr:0.45%; Als:0.041%; V:0.046%, be heated to 1150 ℃ by continuous tunnel furnace after, it is rolling to enter 7 frame tandem rolling units, 1100 ℃ of start rolling temperatures; 900 ℃ of finishing temperatures, the relative draft 46% of the 1st frame; The relative draft 40% of relative draft 44%, the 4～5 frame of the 2nd～3 frame; The relative draft 30% of the 6th～7 frame.Be cooled fast to 750 ℃ after rolling; Naturally cooling 8s is as cold as 500 ℃ then soon and batches, and the belt steel thickness of being produced is 8mm.
The hot-rolled sheet plate performance embodiment of embodiment 1-7 is shown in Table 1 among the present invention.
Table 1:
| Sequence number | R p0.2，MPa | R m，MPa | Rp0.2/Rm | E1，％ |
| Embodiment 1 | 359 | 700 | 0.51 | 23 |
| Embodiment 2 | 347 | 654 | 0.53 | 27 |
| Embodiment 3 | 411 | 742 | 0.55 | 26 |
| Embodiment 4 | 373 | 698 | 0.53 | 23 |
| Embodiment 5 | 346 | 690 | 0.50 | 25 |
| Embodiment 6 | 372 | 716 | 0.52 | 24 |
| Embodiment 7 | 375 | 650 | 0.58 | 23 |
Claims (4)
1, CSP is produced the technology of hot-rolled dual-phase steel, comprises the converter smelting operation, LF stove refining procedure, and the sheet blank continuous casting operation is characterized in that: the weight percent composition of its molten steel is: C:0-0.075%; Si:0.6-1.0%; Mn:1.5-2.0%; Cr:0.4-0.6%; Als:0.010-0.080; V:0.02-0.14%; All the other are Fe and impurity element.
2, CSP according to claim 1 is produced the technology of hot-rolled dual-phase steel, and it is characterized in that: in the sheet blank continuous casting operation, the rolling temperature system is: 1050～1150 ℃ of soaking temperatures; Finishing temperature: 800～900 ℃; Curling temperature: 400～500 ℃.
3, CSP according to claim 1 is produced the technology of hot-rolled dual-phase steel, it is characterized in that: in the sheet blank continuous casting operation, adopt 7 frame hot rollings, draft is F1:40～50% relatively; F2～F3:20～45%; F4～F5:15～40%; F6～F7:10～30%.
4, CSP according to claim 1 is produced the technology of hot-rolled dual-phase steel, it is characterized in that: in the CSP operation, adopt the multi-stage type controlled chilling, the band steel at first is cooled fast to 700～750 ℃ by finishing temperature; Naturally cooling 2～8s batches after being as cold as 400-500 ℃ soon then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100983925A CN100441724C (en) | 2006-12-18 | 2006-12-18 | Process for production of hot-rolled dual phase steel by continuous casting and continuous rolling of slab billet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100983925A CN100441724C (en) | 2006-12-18 | 2006-12-18 | Process for production of hot-rolled dual phase steel by continuous casting and continuous rolling of slab billet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1970813A true CN1970813A (en) | 2007-05-30 |
| CN100441724C CN100441724C (en) | 2008-12-10 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766812A (en) * | 2012-06-19 | 2012-11-07 | 马钢(集团)控股有限公司 | 700 MPa hot-rolled dual phase steel plate with low yield ratio and manufacture method thereof |
| CN107716551A (en) * | 2017-09-20 | 2018-02-23 | 武汉钢铁有限公司 | Method based on CSP flows production Thin Specs hot rolling DP980 steel |
| CN107723602A (en) * | 2017-11-23 | 2018-02-23 | 攀钢集团攀枝花钢铁研究院有限公司 | 750MPa levels hot-rolled ferrite-bainite dual-phase steel and its production method |
| CN107829027A (en) * | 2017-10-19 | 2018-03-23 | 武汉钢铁有限公司 | A kind of Thin Specs 780MPa levels dual phase steel and its processing method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050115649A1 (en) * | 2003-03-27 | 2005-06-02 | Tokarz Christopher A. | Thermomechanical processing routes in compact strip production of high-strength low-alloy steel |
| CN1840252A (en) * | 2005-03-28 | 2006-10-04 | 鞍钢集团新钢铁有限责任公司 | Production process of continuous-casting tandem-rolling coiled sheet of medium thick plate |
| CN100357475C (en) * | 2006-02-17 | 2007-12-26 | 东北大学 | Tensile strength 540Mpa grade dual phase steel plate and its production method |
| CN100357474C (en) * | 2006-02-17 | 2007-12-26 | 东北大学 | Tensile strength 600Mpa grade dual phase steel plate and its production method |
-
2006
- 2006-12-18 CN CNB2006100983925A patent/CN100441724C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766812A (en) * | 2012-06-19 | 2012-11-07 | 马钢(集团)控股有限公司 | 700 MPa hot-rolled dual phase steel plate with low yield ratio and manufacture method thereof |
| CN102766812B (en) * | 2012-06-19 | 2014-06-25 | 马钢(集团)控股有限公司 | 700 MPa hot-rolled dual phase steel plate with low yield ratio and manufacture method thereof |
| CN107716551A (en) * | 2017-09-20 | 2018-02-23 | 武汉钢铁有限公司 | Method based on CSP flows production Thin Specs hot rolling DP980 steel |
| CN107829027A (en) * | 2017-10-19 | 2018-03-23 | 武汉钢铁有限公司 | A kind of Thin Specs 780MPa levels dual phase steel and its processing method |
| CN107723602A (en) * | 2017-11-23 | 2018-02-23 | 攀钢集团攀枝花钢铁研究院有限公司 | 750MPa levels hot-rolled ferrite-bainite dual-phase steel and its production method |
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|---|---|
| CN100441724C (en) | 2008-12-10 |
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Address after: 243003 Department of intellectual property right of Hunan West Road No. 8 technology center, Ma'anshan City, Anhui Province Patentee after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 technical center, 8 West Hunan Road, Ma'anshan, Anhui Patentee before: Ma'anshan Iron and Steel Co., Ltd. |
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Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui Patentee after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Yushan, Ma'anshan, Anhui Patentee before: Ma'anshan Iron and Steel Co., Ltd. |