CN101603153A - A kind of hot-rolled ferrite-bainite dual-phase steel and production method thereof - Google Patents
A kind of hot-rolled ferrite-bainite dual-phase steel and production method thereof Download PDFInfo
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- CN101603153A CN101603153A CNA200910088965XA CN200910088965A CN101603153A CN 101603153 A CN101603153 A CN 101603153A CN A200910088965X A CNA200910088965X A CN A200910088965XA CN 200910088965 A CN200910088965 A CN 200910088965A CN 101603153 A CN101603153 A CN 101603153A
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Abstract
A kind of hot-rolled ferrite-bainite dual-phase steel and production method thereof the invention belongs to ferrous materials engineering field, can be used for making structural parts such as high-strength vehicle wheel.The main component weight percentage that it is characterized in that this steel grade is: C:0.06～0.08, Si:0.40～0.60, Mn:1.40～1.60, P:＜0.02, S:＜0.02, Cr:0.40～0.60, Nb:0.02～0.04.Controlled rolling process non-recrystallization district accumulative total deflection＞60%, 800～830 ℃ of finishing temperatures.Roll back segmentation process of cooling first section water-cooled and be cooled to 700 ℃ with the cooling rate of 30～50 ℃/s, air cooling 12～15s, and after second section water-cooled is cooled to 500 ℃ with the cooling rate of 30～50 ℃/s, batch, slow cooling is to room temperature.The hot-rolled ferrite-bainite dual-phase steel yield strength is 450MPa, and tensile strength reaches 665MPa, and unit elongation is 22%, and yield tensile ratio 0.68 has the good intensity and the coupling of plasticity, and good fracture property.
Description
Technical field:
The invention belongs to ferrous materials engineering field, particularly a kind of hot-rolled ferrite-bainite dual-phase steel and production method thereof can be used for making structural parts such as high-strength vehicle wheel.
Background technology:
Along with going deep into of car body lightweight research, the application of high-strength steel in body of a motor car is more and more wider.Dual phase steel is because of its excellent mechanical property---and low yield strength ratio, high initial manufacture cementation index, good intensity plasticity are mated, be to use at present one of maximum AHSS, meet automotive material lightweight, high-performance, safety, environmental protection, energy-conservation development topic.
Traditional automobile mostly is ferrito-martensite duplex structure with hot-rolled dual-phase steel, and with the martensitic phase ratio as strengthening phase, bainite structure has high hole expansibility, to flange tensile property and all favourable influence of fracture toughness property.Therefore, dual phase steel of ferrite and bainite is applicable to the especially flange tensile property automobile support component of having relatively high expectations of thicker and plasticity, as stamping parts such as spoke of vehicle wheel.
Summary of the invention:
The object of the invention is to produce a kind of hot-rolled ferrite-bainite dual-phase steel, to satisfy the demand of used for automobile wheels high-strength steel.
A kind of hot-rolled ferrite-bainite dual-phase steel is characterized in that the main component weight percentage of this steel grade is:
C:0.06～0.08, Si:0.40～0.60, Mn:1.40～1.60, P:＜0.02, S:＜0.01, Cr:0.40～0.60, Nb:0.02～0.04, surplus are Fe.
A kind of hot-rolled ferrite-bainite dual-phase steel production method is characterized in that adopting behind the hot-rolled steel plate segmentation process for cooling:
Controlled rolling and controlled cooling process key measure is as follows:
(1) non-recrystallization district deflection＞60%, 800～830 ℃ of finishing temperatures.
(2) roll the back and adopt the segmentation process for cooling, comprise first section water-cooled, water-cooled at interval air cooling, second section water-cooled, batch.Steel plate rolls after first section water-cooled is cooled to 700 ℃ with the cooling rate of 30～50 ℃/s, air cooling 12～15s, and after second section water-cooled is cooled to 500 ℃ with the cooling rate of 30～50 ℃/s, batch, slow cooling is to room temperature, and obtaining the hot-rolled ferrite-bainite dual-phase steel yield strength is 450MPa, and tensile strength reaches 665MPa, unit elongation is 22%, yield tensile ratio 0.68.
Hot-rolled ferrite-bainite dual-phase steel of the present invention has the good intensity and the coupling of plasticity, and good fracture property, is applicable to the especially flange tensile property automobile support component of having relatively high expectations of plasticity.
Embodiment:
The main component weight percentage of steel grade is:
C:0.06～0.08, Si:0.40～0.60, Mn:1.40～1.60, P:＜0.02, S:＜0.01, Cr:0.40～0.60, Nb:0.02～0.04, surplus are Fe.
The operation of rolling adopts non-recrystallization district's controlled rolling, non-recrystallization district accumulative total deflection＞60%, 800～830 ℃ of finishing temperatures.
Roll back segmentation process of cooling comprise first section water-cooled, water-cooled at interval air cooling, second section water-cooled, batch.Steel plate rolls after first section water-cooled is cooled to 700 ℃ with the cooling rate of 30～50 ℃/s, air cooling 12～15s, and after second section water-cooled is cooled to 500 ℃ with the cooling rate of 30～50 ℃/s, batch, slow cooling is to room temperature.
The hot-rolled ferrite-bainite dual-phase steel yield strength is 450MPa, and tensile strength reaches 665MPa, and unit elongation is 22%, and yield tensile ratio 0.68 has the good intensity and the coupling of plasticity, and good fracture property.
Claims (2)
1. hot-rolled ferrite-bainite dual-phase steel is characterized in that the main component weight percentage of this steel grade is:
C:0.06～0.08, Si:0.40～0.60, Mn:1.40～1.60, P:＜0.02, S:＜0.01, Cr:0.40～0.60, Nb:0.02～0.04, surplus are Fe.
2. the production method of hot-rolled ferrite-bainite dual-phase steel as claimed in claim 1, adopt the segmentation process for cooling behind the hot-rolled steel plate:
Controlled rolling and controlled cooling process key measure is as follows:
(1) non-recrystallization district deflection＞60%, 800～830 ℃ of finishing temperatures;
(2) roll the back and adopt the segmentation process for cooling, comprise first section water-cooled, water-cooled at interval air cooling, second section water-cooled, batch; Steel plate rolls after first section water-cooled is cooled to 700 ℃ with the cooling rate of 30～50 ℃/s, air cooling 12～15s, and after second section water-cooled is cooled to 500 ℃ with the cooling rate of 30～50 ℃/s, batch, slow cooling is to room temperature, and obtaining the hot-rolled ferrite-bainite dual-phase steel yield strength is 450MPa, and tensile strength reaches 665MPa, unit elongation is 22%, yield tensile ratio 0.68.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200910088965XA CN101603153A (en) | 2009-07-15 | 2009-07-15 | A kind of hot-rolled ferrite-bainite dual-phase steel and production method thereof |
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| CNA200910088965XA CN101603153A (en) | 2009-07-15 | 2009-07-15 | A kind of hot-rolled ferrite-bainite dual-phase steel and production method thereof |
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| CN101603153A true CN101603153A (en) | 2009-12-16 |
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| CNA200910088965XA Pending CN101603153A (en) | 2009-07-15 | 2009-07-15 | A kind of hot-rolled ferrite-bainite dual-phase steel and production method thereof |
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Cited By (6)
| 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 |
| CN105525213A (en) * | 2016-01-21 | 2016-04-27 | 东北大学 | High-strength-toughness and high-temperature hot rolled steel plate and preparation method thereof |
| CN106216412A (en) * | 2016-07-29 | 2016-12-14 | 安阳钢铁股份有限公司 | A kind of method utilizing stove volume unit laminar flow sub-sectional cooling to control cut deal phase transformation |
| 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 |
| CN112080689A (en) * | 2020-08-19 | 2020-12-15 | 本钢板材股份有限公司 | Steel for wheel and preparation method thereof |
| CN115233102A (en) * | 2022-07-26 | 2022-10-25 | 张家港宏昌钢板有限公司 | Low-yield-ratio high-strength steel plate and production method thereof |
-
2009
- 2009-07-15 CN CNA200910088965XA patent/CN101603153A/en active Pending
Cited By (7)
| 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 |
| CN105525213A (en) * | 2016-01-21 | 2016-04-27 | 东北大学 | High-strength-toughness and high-temperature hot rolled steel plate and preparation method thereof |
| CN106216412A (en) * | 2016-07-29 | 2016-12-14 | 安阳钢铁股份有限公司 | A kind of method utilizing stove volume unit laminar flow sub-sectional cooling to control cut deal phase transformation |
| 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 |
| CN109161797B (en) * | 2018-09-06 | 2020-11-03 | 邯郸钢铁集团有限责任公司 | Lightweight fatigue-resistant hot-rolled dual-phase wheel steel and production method thereof |
| CN112080689A (en) * | 2020-08-19 | 2020-12-15 | 本钢板材股份有限公司 | Steel for wheel and preparation method thereof |
| CN115233102A (en) * | 2022-07-26 | 2022-10-25 | 张家港宏昌钢板有限公司 | Low-yield-ratio high-strength steel plate and production method thereof |
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Open date: 20091216 |