CN104962807A - High-strength hot rolled steel as well as manufacturing method and application thereof - Google Patents
High-strength hot rolled steel as well as manufacturing method and application thereof Download PDFInfo
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- CN104962807A CN104962807A CN201510401643.1A CN201510401643A CN104962807A CN 104962807 A CN104962807 A CN 104962807A CN 201510401643 A CN201510401643 A CN 201510401643A CN 104962807 A CN104962807 A CN 104962807A
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Abstract
The invention belongs to the technical field of production of hot continuously-rolled strips and particularly relates to a hot rolled steel plate for an automobile compartment having the strength being greater than or equal to 600MPa and a manufacturing method of the hot rolled steel plate. The high-strength hot rolled steel plate comprises the following chemical components in percentage by weight: 0.05-0.10 percent of C, 1.30-1.60 percent of Mn, 0.06-0.09 percent of V, less than or equal to 0.30 percent of Si, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S and the balance of Fe and inevitable impurities. The hot rolled steel plate for the automobile compartment is produced by adopting a manganese and vanadium alloying manner; the yield strength of the hot rolled steel plate reach over 600MPa, the tensile strength of the hot rolled steel plate reaches over 650MPa, and the ductility of the hot rolled steel plate reaches over 15 percent; the high-strength hot rolled steel plate has the characteristics of high strength, stable mechanical property, favorable toughness matching and excellent molding property; the mechanical property of the hot rolled steel plate can meet the requirement of light weight of an automobile.
Description
Technical field
The invention belongs to hot continuous rolling strip production technical field, particularly relate to a kind of intensity >=600MPa level automobile bodies hot-rolled steel sheet and preparation method thereof.
Background technology
In current automobile production, using maximum is common low carbon steel plate.Mild steel plate has good plastic deformation ability, and strength and stiffness also can meet the requirement of body of a motor car, can meet the requirement of vehicle body welding simultaneously, therefore apply very wide on body of a motor car.Under the manufacturing process and state of the art of present stage, body lightening is the important means solving heavy-load automobile over burdening and energy-saving and emission-reduction.Use High Strength Steel, by thinning steel plate thickness and the weight alleviating vehicle body, product work-ing life can be improved under the prerequisite reducing deadweight, still meet the requirement of body of a motor car mechanical property.
Domestic current cargo truck compartment board main steel is 16Mn, Q345B, and high strength compartment board consumption is less, with same kind of products at abroad phase proportion 15% ~ 20%.In order to reduce production cost and improve component security, hot-rolled steel sheet exploitation in high-strength vehicle compartment is to bring into schedule gradually.Current Railway Car Plant and refitting factory have proposed the purpose of demand to high-strength vehicle compartment hot-rolled steel sheet, and Ge great steel mill also carries out the research work of this respect successively.
Publication number is " CN102787272A ", and send out name and be called " a kind of preparation method of motor vehicle body hot rolling acid-cleaning high-strength steel ", disclosing a kind of main chemical compositions is: C:0.07% ~ 0.1%; Si≤0.05%; Mn:1.5% ~ 1.9%; Mo:0.1% ~ 0.2%; Nb:0.04% ~ 0.06%; Ti:0.15% ~ 0.2%; B:0.001% ~ 0.004%, the tensile strength >=1200MPa of product, the preparation method of a kind of motor vehicle body hot rolling acid-cleaning high-strength steel of unit elongation >=13%.In this patent, Hot Rolled and Pickled Sheet is the middle emerging product of one between hot-rolled sheet and cold-reduced sheet.
Publication number is " CN101660099A ", denomination of invention is " high strength low alloy hot rolling ferrite bainite weathering resistant steel and production method thereof ", disclosing a kind of main chemical compositions is: C:0.05 ~ 0.10%, Si:0.30 ~ 0.45%, Mn:1.00 ~ 1.50%, Cr:0.50 ~ 0.70%, Ni:0.20 ~ 0.30%, Cu:0.20 ~ 0.40%, Ti:0.01 ~ 0.025%, Nb:0.03 ~ 0.05%, a kind of hot-rolled ferrite-bainite steel of product yield strength >=450MPa.Alloying element containing costlinesses such as Cu, Cr, Ni in steel in this patent, cost is higher.
Publication number is " CN1785543A ", and denomination of invention is " a kind of technique applying bar strip continuous casting and rolling flow path production Ti micro-alloying high-strength weathering steel plate ", and disclosing its main chemical compositions a kind of is: C:0.04 ~ 0.07%; Si:0.3 ~ 0.5%; Mn:0.4 ~ 1.2%; Cu:0.20 ~ 0.40%; Ni:0.15 ~ 0.35%; Ti:0.02 ~ 0.15%; Cr:0.3 ~ 0.5%.Adopt continuous casting and rolling technique of sheet bar, containing the alloying element that Cu, Cr, Ni etc. are expensive in steel, production cost is higher.
So, for the deficiencies in the prior art, need a kind ofly have that steel grade cost of alloy is low, high tensile steel plate that rolling technology controls the features such as simple and strong adaptability.
Summary of the invention
First technical problem to be solved by this invention is to provide a kind of high strength rolled steel, and this hot-rolled steel meets the requirement of the automobile bodies hot continuous-milling steel plate of the yield strength 600MPa level that intensity is high, stable mechanical property, obdurability coupling is good and processability is excellent.
A kind of high strength rolled steel, its chemical composition is by weight percentage: C 0.05% ~ 0.10%, Mn 1.30% ~ 1.60%, V 0.06 ~ 0.09%, Si≤0.30%, P≤0.020%, S≤0.010%, and surplus is Fe and inevitable impurity.
A kind of high strength rolled steel described above, the yield strength ReL >=600MPa of steel, tensile strength Rm >=650MPa, unit elongation A >=15.0%.
Further, as preferred technical scheme, a kind of high strength rolled steel described above, its chemical composition is by weight percentage: C 0.06%, Mn 1.47%, V 0.079%, Si≤0.26%, P≤0.014%, S≤0.007%, surplus is Fe and inevitable impurity; The yield strength ReL 669MPa of steel, tensile strength Rm 728MPa, unit elongation A 22.5%.
The present invention adopts manganese, vanadium micro-alloying mode, adds vanadium, manganese as main alloy element, plays good precipitation strength and grain refining effect, avoid noble elements such as adding Mo, Nb, Ni, reduce production cost in steel.Produce the automobile bodies hot-rolled steel sheet of ferrite+bainite structure, its yield strength reaches more than 600MPa, tensile strength reaches more than 650MPa, unit elongation reaches more than 15%, have the advantages that intensity is high, stable mechanical property, obdurability coupling is good and processability is excellent, product mechanical property meets the requirement of automotive light weight technology.Steel grade cost of alloy of the present invention is low, rolling technology controls simple and adaptability is comparatively strong, has good popularizing application prospect.
Second technical problem to be solved by this invention is to provide a kind of preparation method of high strength rolled steel.
A kind of high strength rolled steel preparation method, production technique roughly step is: hot metal pretreatment → converter → external refining → casting slab → heating → high-pressure water descaling → roughing → finish rolling → cool → batch.
Wherein, specifically comprise the following steps:
A, after conventional desulfurizing iron, converter smelting and the refining of LF stove, ensure molten steel composition be by weight percentage: C 0.05% ~ 0.10%, Mn 1.30% ~ 1.60%, V 0.06 ~ 0.09%, Si≤0.30%, P≤0.020%, S≤0.010%, surplus is Fe and inevitable impurity;
B, by the molten steel after above-mentioned process, roll into the continuously cast bloom that 200 ~ 230mm is thick, soaking at 1180 DEG C ~ 1240 DEG C, soaking time >=180min, then through dephosphorize by high pressure water;
C, the slab of b step after dephosphorize by high pressure water is first adopted 3 ~ 7 passage roughing, rolling into thickness is 30 ~ 60mm intermediate blank, then carries out finish rolling through 4 ~ 7 frames, and finishing temperature is 800 ~ 840 DEG C;
D, the slab after step c rolling is cooled to 720 DEG C with the speed of cooling of 5 ~ 30 DEG C/s, air cooling 8 ~ 10s; 350 ~ 450 DEG C are cooled to again with the speed of cooling of 5 ~ 30 DEG C/s, curling, obtain ferrite+bainitic steel tissue.
Further, a kind of high strength rolled steel preparation method described above, in wherein said b step, continuously cast bloom soaking temperature is preferably 1220 ~ 1240 DEG C.
Further, in step c described above, after roughing, workpiece thickness is preferably 38 ~ 48mm, and finishing temperature is preferably 800 ~ 840 DEG C.
Further, the speed of cooling of the slab in Step d described above after rolling is preferably 20 ~ 27 DEG C/s, and air cooling time is preferably 9s, and final cooling temperature is preferably 360 ~ 410 DEG C.
The present invention adopts cooling controlling and rolling controlling process, and the yield strength 600MPa level producing ferrite and bainite structure meets the requirement of automobile bodies hot-rolled steel sheet, has that steel grade cost of alloy is low, rolling technology controls the features such as simple and strong adaptability.
Beneficial effect of the present invention is as follows:
1, the present invention adopts Mn-V microalloying mode, and its mass percent is respectively C 0.05-0.10%, and Mn 1.30-1.60%, V 0.06-0.09%, avoids noble elements such as adding Mo, Nb, Ni, reduces steel grade cost of alloy.
2, the present invention adopts the cooling controlling and rolling controlling process system that conventional chilling+air cooling+low temperature batches, technology controlling and process is simple, produce the automobile bodies hot-rolled steel sheet of ferrite and bainite structure, its yield strength reaches more than 600MPa, tensile strength reaches more than 650MPa, unit elongation reaches more than 15%, has obdurability and mates feature that is good and processability excellence.
3, product of the present invention also has the feature such as stable mechanical property, strong adaptability, and product mechanical property meets the requirement of automotive light weight technology.
Embodiment
A kind of high strength rolled steel, its chemical composition is by weight percentage: C 0.05% ~ 0.10%, Mn 1.30% ~ 1.60%, V 0.06 ~ 0.09%, Si≤0.30%, P≤0.020%, S≤0.010%, and surplus is Fe and inevitable impurity.
A kind of high strength rolled steel described above, the yield strength ReL >=600MPa of steel, tensile strength Rm >=650MPa, unit elongation A >=15.0%.
Further, as preferred technical scheme, a kind of high strength rolled steel described above, its chemical composition is by weight percentage: C 0.06%, Mn 1.47%, V 0.079%, Si≤0.26%, P≤0.014%, S≤0.007%, surplus is Fe and inevitable impurity; The yield strength ReL 669MPa of steel, tensile strength Rm 728MPa, unit elongation A 22.5%.
The present invention adopts manganese, vanadium micro-alloying mode, adds vanadium, manganese as main alloy element, plays good precipitation strength and grain refining effect, avoid noble elements such as adding Mo, Nb, Ni, reduce production cost in steel.Produce the automobile bodies hot-rolled steel sheet of ferrite+bainite structure, its yield strength reaches more than 600MPa, tensile strength reaches more than 650MPa, unit elongation reaches more than 15%, have the advantages that intensity is high, stable mechanical property, obdurability coupling is good and processability is excellent, product mechanical property meets the requirement of automotive light weight technology.Steel grade cost of alloy of the present invention is low, rolling technology controls simple and adaptability is comparatively strong, has good popularizing application prospect.
A kind of high strength rolled steel preparation method, production technique roughly step is: hot metal pretreatment → converter → external refining → casting slab → heating → high-pressure water descaling → roughing → finish rolling → cool → batch.
Wherein, specifically comprise the following steps:
A, after conventional desulfurizing iron, converter smelting and the refining of LF stove, ensure molten steel composition be by weight percentage: C 0.05% ~ 0.10%, Mn 1.30% ~ 1.60%, V 0.06 ~ 0.09%, Si≤0.30%, P≤0.020%, S≤0.010%, surplus is Fe and inevitable impurity;
B, by the molten steel after above-mentioned process, roll into the continuously cast bloom that 200 ~ 230mm is thick, soaking at 1180 DEG C ~ 1240 DEG C, soaking time >=180min, then through dephosphorize by high pressure water;
C, the slab of b step after dephosphorize by high pressure water is first adopted 3 ~ 7 passage roughing, rolling into thickness is 30 ~ 60mm intermediate blank, then carries out finish rolling through 4 ~ 7 frames, and finishing temperature is 800 ~ 840 DEG C;
D, the slab after step c rolling is cooled to 720 DEG C with the speed of cooling of 5 ~ 30 DEG C/s, air cooling 8 ~ 10s; 350 ~ 450 DEG C are cooled to again with the speed of cooling of 5 ~ 30 DEG C/s, curling, obtain ferrite+bainitic steel tissue.
Further, a kind of high strength rolled steel preparation method described above, in wherein said b step, continuously cast bloom soaking temperature is preferably 1220 ~ 1240 DEG C.
Further, in step c described above, after roughing, workpiece thickness is preferably 38 ~ 48mm, and finishing temperature is preferably 800 ~ 840 DEG C.
Further, the speed of cooling of the slab in Step d described above after rolling is preferably 20 ~ 27 DEG C/s, and air cooling time is preferably 9s, and final cooling temperature is preferably 360 ~ 410 DEG C.
The present invention adopts cooling controlling and rolling controlling process, and the yield strength 600MPa level producing ferrite and bainite structure meets the requirement of automobile bodies hot-rolled steel sheet, has that steel grade cost of alloy is low, rolling technology controls the features such as simple and strong adaptability.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
One, high tensile hot rolled steel sheet is prepared
A, after conventional desulfurizing iron, converter smelting and the refining of LF stove, ensure molten steel composition be by weight percentage: C 0.05% ~ 0.10%, Mn 1.30% ~ 1.60%, V 0.06 ~ 0.09%, Si≤0.30%, P≤0.020%, S≤0.010%, surplus is Fe and inevitable impurity.In the embodiment of the present invention 1, the chemical composition of the molten steel of numbering 1 ~ 5 group is in table 1.
The chemical composition of steel in table 1 embodiment 1
B, by the molten steel after above-mentioned process, roll into continuously cast bloom further, continuous casting steel billet carried out respectively successively heating of plate blank, high-pressure water descaling, roughing, finish rolling, section cooling and batch, thus obtained hot continuous-milling steel plate.Wherein, the thickness of the temperature of heating of plate blank, workpiece thickness, finish rolling finishing temperature, air cooling time, coiling temperature and steel plate is as shown in table 2 respectively.
The preparation technology parameter of table 2 hot-rolled steel
Two, the performance test of hot-rolled steel sheet
The afterbody sampling of the coil of strip of the automobile bodies hot continuous-milling steel plate that numbering 1 ~ 5 group obtains in above embodiment 1, and detect yield strength (ReL), tensile strength (Rm) and unit elongation (A%) according to the method that GB/T228 specifies, the method specified according to GB/T232 detects cold-bending property (B=35, α=180 °, d=2a; The width that d represents Bend diameter, a represents sample thickness, α represents bending angle, B represents sample), its detected result is as shown in table 3.
The performance of each group hot-rolled steel in table 3 embodiment 1
| Numbering | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation (%) | Cold-bending property |
| 1 | 616 | 679 | 16.0 | Qualified |
| 2 | 627 | 696 | 19.5 | Qualified |
| 3 | 643 | 701 | 20.5 | Qualified |
| 4 | 669 | 728 | 22.5 | Qualified |
| 5 | 641 | 695 | 20.0 | Qualified |
Claims (8)
1. a high strength rolled steel, is characterized in that: its chemical composition is by weight percentage: C 0.05% ~ 0.10%, Mn1.30% ~ 1.60%, V 0.06 ~ 0.09%, Si≤0.30%, P≤0.020%, S≤0.010%, surplus is Fe and inevitable impurity.
2. a kind of high strength rolled steel according to claim 1, is characterized in that: the yield strength ReL >=600MPa of steel, tensile strength Rm >=650MPa, unit elongation A >=15.0%.
3. a kind of high strength rolled steel according to claim 1 or 2, is characterized in that: its chemical composition is by weight percentage: C 0.06%, Mn 1.47%, V 0.079%, Si≤0.26%, P≤0.014%, S≤0.007%, surplus is Fe and inevitable impurity; The yield strength ReL 669MPa of steel, tensile strength Rm 728MPa, unit elongation A 22.5%.
4. the preparation method of a kind of high strength rolled steel described in any one of claims 1 to 3, is characterized in that: comprise the following steps:
A, after conventional desulfurizing iron, converter smelting and the refining of LF stove, ensure molten steel composition be by weight percentage: C 0.05% ~ 0.10%, Mn 1.30% ~ 1.60%, V 0.06 ~ 0.09%, Si≤0.30%, P≤0.020%, S≤0.010%, surplus is Fe and inevitable impurity;
B, by the molten steel after above-mentioned process, roll into the continuously cast bloom that 200 ~ 230mm is thick, soaking at 1180 DEG C ~ 1240 DEG C, soaking time >=180min, then through dephosphorize by high pressure water;
C, the slab of b step after dephosphorize by high pressure water is first adopted 3 ~ 7 passage roughing, rolling into thickness is 30 ~ 60mm intermediate blank, then carries out finish rolling through 4 ~ 7 frames, and finishing temperature is 800 ~ 840 DEG C;
D, the slab after step c rolling is cooled to 720 DEG C with the speed of cooling of 5 ~ 30 DEG C/s, air cooling 8 ~ 10s; 350 ~ 450 DEG C are cooled to again with the speed of cooling of 5 ~ 30 DEG C/s, curling, obtain ferrite+bainitic steel tissue.
5. the preparation method of a kind of high strength rolled steel according to claim 4, is characterized in that: in described b step, continuously cast bloom soaking temperature is 1220 ~ 1240 DEG C.
6. the preparation method of a kind of high strength rolled steel according to claim 4, it is characterized in that: in described step c, after roughing, workpiece thickness is 38 ~ 48mm, finishing temperature is 800 ~ 840 DEG C.
7. the preparation method of a kind of high strength rolled steel according to claim 4, is characterized in that: the speed of cooling of the slab in described Step d after rolling is 20 ~ 27 DEG C/s, and air cooling time is 9s, and final cooling temperature is 360 ~ 410 DEG C.
8. a kind of high strength rolled steel described in any one of claims 1 to 3 is used for the purposes of automobile bodies steel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110592495A (en) * | 2019-10-25 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | 600 MPa-grade vanadium-containing hot-rolled dual-phase steel |
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| JPS57145965A (en) * | 1981-03-04 | 1982-09-09 | Kobe Steel Ltd | High strength hot rolled steel plate and its manufacture |
| CN102943205A (en) * | 2012-11-28 | 2013-02-27 | 东北大学 | Ferrite/bainite hot-rolled dual-phase steel with tensile strength level of 580MPa and preparation method thereof |
| CN103088258A (en) * | 2013-01-23 | 2013-05-08 | 马鞍山钢铁股份有限公司 | Five hundred and ninety Mpa-grade dual-phase steel and production method thereof |
| CN103510008A (en) * | 2013-09-18 | 2014-01-15 | 济钢集团有限公司 | Hot rolling ferrite/bainite high strength steel plate and manufacturing method thereof |
| CN104513930A (en) * | 2014-12-19 | 2015-04-15 | 宝山钢铁股份有限公司 | Ultrahigh-strength hot-rolled complex phase steel plate and steel strip with good bending and broaching performance and manufacturing method thereof |
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2015
- 2015-07-10 CN CN201510401643.1A patent/CN104962807B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57145965A (en) * | 1981-03-04 | 1982-09-09 | Kobe Steel Ltd | High strength hot rolled steel plate and its manufacture |
| CN102943205A (en) * | 2012-11-28 | 2013-02-27 | 东北大学 | Ferrite/bainite hot-rolled dual-phase steel with tensile strength level of 580MPa and preparation method thereof |
| CN103088258A (en) * | 2013-01-23 | 2013-05-08 | 马鞍山钢铁股份有限公司 | Five hundred and ninety Mpa-grade dual-phase steel and production method thereof |
| CN103510008A (en) * | 2013-09-18 | 2014-01-15 | 济钢集团有限公司 | Hot rolling ferrite/bainite high strength steel plate and manufacturing method thereof |
| CN104513930A (en) * | 2014-12-19 | 2015-04-15 | 宝山钢铁股份有限公司 | Ultrahigh-strength hot-rolled complex phase steel plate and steel strip with good bending and broaching performance and manufacturing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110592495A (en) * | 2019-10-25 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | 600 MPa-grade vanadium-containing hot-rolled dual-phase steel |
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