CN104962807B - A kind of high strength rolled steel and its preparation method and application - Google Patents
A kind of high strength rolled steel and its preparation method and application Download PDFInfo
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Abstract
The invention belongs to hot-rolling plate band production technical field, more particularly to a kind of intensity >=600MPa grades of automobile bodies hot rolled steel plate and preparation method thereof.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%, balance of Fe and inevitable impurity.The present invention is using manganese, vanadium micro-alloying mode, produce automobile bodies hot rolled steel plate, its yield strength reaches more than 600MPa, tensile strength reaches more than 650MPa, elongation percentage reaches more than 15%, with intensity is high, good stable mechanical property, obdurability matching and the characteristics of excellent processability, product mechanical property meets the requirement of automotive light weight technology.
Description
Technical field
The invention belongs to hot-rolling plate band production technical field, more particularly to a kind of intensity >=600MPa grades of automobile bodies
With hot rolled steel plate and preparation method thereof.
Background technology
In current automobile production, using it is most be common low carbon steel plate.Low carbon steel plate has good plastic working
Can, strength and stiffness can also meet the requirement of body of a motor car, while the requirement of vehicle body welding can be met, therefore on body of a motor car
Using very wide.Under manufacturing process at this stage and technical merit, body lightening is to solve heavy-load automobile over burdening and energy-conservation
The important means of emission reduction.Using high strength steel, by thinning steel plate thickness and the weight of mitigation vehicle body, can conduct oneself with dignity reducing
On the premise of improve product service life, still meet the requirement of body of a motor car mechanical performance.
Domestic truck compartment board main steel at present is 16Mn, Q345B, and high intensity compartment board consumption is less, with
Same kind of products at abroad compares weight 15%~20%.In order to reduce production cost and improve component security, high-strength vehicle compartment
Developed gradually to bring into schedule with hot rolled steel plate.Current Railway Car Plant and refitting factory are to high-strength vehicle compartment hot rolled steel plate
The purpose of demand has been proposed, major steel mill also carries out the research work of this respect successively.
Publication No. " CN102787272A ", hair name is referred to as a kind of " preparation of motor vehicle body hot rolling acid-cleaning high-strength steel
Method ", 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 tension of product
Intensity >=1200MPa, a kind of motor vehicle body of elongation percentage >=13% preparation method of hot rolling acid-cleaning high strength steel.In the patent
Hot Rolled and Pickled Sheet is the middle emerging product of one kind between hot rolled plate and cold-reduced sheet.
Publication No. " CN101660099A ", entitled " high strength low alloy hot rolling ferrite bainite weathering resistant steel
And its production method ", 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：
A kind of hot-rolled ferrite-bainite steel of 0.03~0.05%, product yield strength >=450MPa.In the patent in steel containing Cu,
Cr, Ni etc. expensive alloying element, it is relatively costly.
Publication No. " CN1785543A ", entitled " one kind application bar strip continuous casting and rolling flow path production micro- conjunctions of Ti
The technique of aurification high-strength weathering steel plate ", disclosing a kind of its main chemical compositions 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%.Using 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, in view of the shortcomings of the prior art, it is necessary to it is a kind of have that steel grade cost of alloy is low, rolling mill practice control is simple and
The high-strength steel sheet of the features such as strong adaptability.
The content of the invention
First technical problem to be solved by this invention is to provide a kind of high strength rolled steel, and the hot-rolled steel meets intensity
Height, stable mechanical property, obdurability match the automobile bodies heat of excellent yield strength 600MPa grades of good and processability
The requirement of continuous-milling steel plate.
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%, balance of Fe is miscellaneous with inevitable
Matter.
A kind of high strength rolled steel described above, the yield strength ReL >=600MPa of steel, tensile strength Rm >=650MPa,
Elongation percentage A >=15.0%.
Further, as preferred technical scheme, a kind of high strength rolled steel described above, its chemical composition is by weight
Measuring percentage is：C 0.06%, Mn 1.47%, V 0.079%, Si≤0.26%, P≤0.014%, S≤0.007%, surplus
It is Fe and inevitable impurity；The yield strength ReL 669MPa of steel, tensile strength Rm 728MPa, elongation percentage A 22.5%.
The present invention is played as main alloy element using manganese, vanadium micro-alloying mode, addition vanadium, manganese in steel
Preferable precipitation strength and grain refining effect, it is to avoid the noble element such as addition Mo, Nb, Ni, reduce production cost.Production
Go out the automobile bodies hot rolled steel plate of ferrite+bainite structure, its yield strength reaches more than 600MPa, and tensile strength reaches
More than 650MPa, elongation percentage reaches more than 15%, with intensity is high, the matching of stable mechanical property, obdurability is good and mouldability
Can be excellent the characteristics of, product mechanical property meets the requirement of automotive light weight technology.Steel grade cost of alloy of the present invention is low, rolling mill practice control
System is simple and adaptability is stronger, with preferable 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 technology substantially step is：The outer essence of molten iron pretreatment → converter → stove
Refining → casting slab → heating → high-pressure water descaling → roughing → finish rolling → cool down → batch.
Wherein, following steps are specifically included：
A, by after the refining of conventional desulfurizing iron, converter smelting and LF stoves, it is ensured that molten steel 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%, balance of Fe and inevitable impurity；
B, by the molten steel after above-mentioned treatment, roll into the thick continuous casting billets of 200~230mm, at 1180 DEG C~1240 DEG C
Heat, soaking time >=180min, then by water under high pressure dephosphorization；
C, b step is first used into 3~7 passage roughing by the slab after water under high pressure dephosphorization, roll into thickness for 30~
Base in the middle of 60mm, then finish rolling is carried out through 4~7 frames, finishing temperature is 800~840 DEG C；
D, step c is rolled after slab 720 DEG C, 8~10s of air cooling are cooled to the cooling velocity of 5~30 DEG C/s；Again with
The cooling velocity of 5~30 DEG C/s is cooled to 350~450 DEG C, and curling obtains ferrite+bainitic steel tissue.
Further, a kind of high strength rolled steel preparation method described above, wherein continuous casting billet soaking temperature in the b step
Degree is preferably 1220~1240 DEG C.
Further, workpiece thickness is preferably 38~48mm after roughing in step c described above, and finishing temperature is preferably
800~840 DEG C.
Further, the cooling velocity of the slab after being rolled in Step d described above is preferably 20~27 DEG C/s, during air cooling
Between be preferably 9s, final cooling temperature is preferably 360~410 DEG C.
The present invention uses cooling controlling and rolling controlling process, produces yield strength 600MPa grades of satisfaction of ferrite and bainite structure
The requirement of automobile bodies hot rolled steel plate, with steel grade cost of alloy is low, simple rolling mill practice control and the features such as strong adaptability.
The present invention has the beneficial effect that：
1st, the present invention uses Mn-V microalloying modes, its mass percent to be respectively C 0.05-0.10%, Mn 1.30-
1.60%, V 0.06-0.09%, it is to avoid the noble element such as addition Mo, Nb, Ni, reduce steel grade cost of alloy.
2nd, the cooling controlling and rolling controlling process system that the present invention is batched using conventional chilling+air cooling+low temperature, technology controlling and process is simple, raw
The automobile bodies hot rolled steel plate of output ferrite and bainite structure, its yield strength reaches more than 600MPa, tensile strength
More than 650MPa is reached, elongation percentage reaches more than 15%, with obdurability matching is good and the characteristics of excellent processability.
3rd, the features such as product of the present invention also has stable mechanical property, strong adaptability, it is light that product mechanical property meets automobile
The requirement of quantization.
Specific 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%, balance of Fe is miscellaneous with inevitable
Matter.
A kind of high strength rolled steel described above, the yield strength ReL >=600MPa of steel, tensile strength Rm >=650MPa,
Elongation percentage A >=15.0%.
Further, as preferred technical scheme, a kind of high strength rolled steel described above, its chemical composition is by weight
Measuring percentage is：C 0.06%, Mn 1.47%, V 0.079%, Si≤0.26%, P≤0.014%, S≤0.007%, surplus
It is Fe and inevitable impurity；The yield strength ReL 669MPa of steel, tensile strength Rm 728MPa, elongation percentage A 22.5%.
The present invention is played as main alloy element using manganese, vanadium micro-alloying mode, addition vanadium, manganese in steel
Preferable precipitation strength and grain refining effect, it is to avoid the noble element such as addition Mo, Nb, Ni, reduce production cost.Production
Go out the automobile bodies hot rolled steel plate of ferrite+bainite structure, its yield strength reaches more than 600MPa, and tensile strength reaches
More than 650MPa, elongation percentage reaches more than 15%, with intensity is high, the matching of stable mechanical property, obdurability is good and mouldability
Can be excellent the characteristics of, product mechanical property meets the requirement of automotive light weight technology.Steel grade cost of alloy of the present invention is low, rolling mill practice control
System is simple and adaptability is stronger, with preferable popularizing application prospect.
A kind of high strength rolled steel preparation method, production technology substantially step is：The outer essence of molten iron pretreatment → converter → stove
Refining → casting slab → heating → high-pressure water descaling → roughing → finish rolling → cool down → batch.
Wherein, following steps are specifically included：
A, by after the refining of conventional desulfurizing iron, converter smelting and LF stoves, it is ensured that molten steel 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%, balance of Fe and inevitable impurity；
B, by the molten steel after above-mentioned treatment, roll into the thick continuous casting billets of 200~230mm, at 1180 DEG C~1240 DEG C
Heat, soaking time >=180min, then by water under high pressure dephosphorization；
C, b step is first used into 3~7 passage roughing by the slab after water under high pressure dephosphorization, roll into thickness for 30~
Base in the middle of 60mm, then finish rolling is carried out through 4~7 frames, finishing temperature is 800~840 DEG C；
D, step c is rolled after slab 720 DEG C, 8~10s of air cooling are cooled to the cooling velocity of 5~30 DEG C/s；Again with
The cooling velocity of 5~30 DEG C/s is cooled to 350~450 DEG C, and curling obtains ferrite+bainitic steel tissue.
Further, a kind of high strength rolled steel preparation method described above, wherein continuous casting billet soaking temperature in the b step
Degree is preferably 1220~1240 DEG C.
Further, workpiece thickness is preferably 38~48mm after roughing in step c described above, and finishing temperature is preferably
800~840 DEG C.
Further, the cooling velocity of the slab after being rolled in Step d described above is preferably 20~27 DEG C/s, during air cooling
Between be preferably 9s, final cooling temperature is preferably 360~410 DEG C.
The present invention uses cooling controlling and rolling controlling process, produces yield strength 600MPa grades of satisfaction of ferrite and bainite structure
The requirement of automobile bodies hot rolled steel plate, with steel grade cost of alloy is low, simple rolling mill practice control and the features such as strong adaptability.
Specific embodiment of the invention is further described with reference to embodiment, is not therefore limited the present invention
System is among described scope of embodiments.
Embodiment 1
First, high tensile hot rolled steel sheet is prepared
A, by after the refining of conventional desulfurizing iron, converter smelting and LF stoves, it is ensured that molten steel 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%, balance of Fe and inevitable impurity.The chemical composition of the molten steel of 1~5 group of numbering is shown in Table in the embodiment of the present invention 1
1。
The chemical composition of steel in the embodiment 1 of table 1
B, by the molten steel after above-mentioned treatment, further roll into continuous casting billet, continuous casting steel billet is carried out slab successively respectively and is added
Heat, high-pressure water descaling, roughing, finish rolling, section cooling and batch, so as to hot continuous-milling steel plate is obtained.Wherein, the temperature of heating of plate blank
The thickness of degree, 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 the hot-rolled steel of table 2
2nd, the performance test of hot rolled steel plate
The afterbody sampling of the coil of strip of automobile bodies hot continuous-milling steel plate obtained in 1~5 group of numbering in above example 1,
And the method specified according to GB/T228 detects yield strength (ReL), tensile strength (Rm) and elongation percentage (A%), according to GB/
Method detection cold-bending property (B=35, α=180 °, d=2a that T232 specifies；D represents that Bend diameter, a represent sample thickness, α
Represent that the angle of bending, B represent the width of sample), its testing result is as shown in table 3.
The performance of each group hot-rolled steel in the embodiment 1 of table 3
| Numbering | Yield strength (MPa) | Tensile strength (MPa) | Elongation percentage (%) | Cold-bending property |
| 1 | 616 | 679 | 16.0 | It is qualified |
| 2 | 627 | 696 | 19.5 | It is qualified |
| 3 | 643 | 701 | 20.5 | It is qualified |
| 4 | 669 | 728 | 22.5 | It is qualified |
| 5 | 641 | 695 | 20.0 | It is qualified |
Claims (6)
1. a kind of high strength rolled steel, it is characterised 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%, balance of Fe and inevitable impurity；Steel
Yield strength ReL 669MPa, tensile strength Rm 728MPa, elongation percentage A 22.5%.
2. a kind of preparation method of high strength rolled steel described in claim 1, it is characterised in that：Comprise the following steps：
A, by after the refining of conventional desulfurizing iron, converter smelting and LF stoves, it is ensured that molten steel composition is by weight percentage：C
0.06%, Mn 1.47%, V 0.079%, Si≤0.26%, P≤0.014%, S≤0.007% and can not be kept away balance of Fe
Exempt from impurity；
B, by the molten steel after above-mentioned treatment, be rolled into the thick continuous casting billets of 200~230mm, the soaking at 1180 DEG C~1240 DEG C,
Soaking time >=180min, then by high-pressure water descaling；
C, b step is first used into 3~7 passage roughing by the slab after high-pressure water descaling, roll into thickness in 30~60mm
Between base, then carry out finish rolling through 4~7 frames, finishing temperature is 800~840 DEG C；
D, step c is rolled after slab 720 DEG C, 8~10s of air cooling are cooled to the cooling velocity of 5~30 DEG C/s；Again with 5~
The cooling velocity of 30 DEG C/s is cooled to 350~450 DEG C, and curling obtains ferrite+bainitic steel tissue.
3. a kind of preparation method of high strength rolled steel according to claim 2, it is characterised in that：Continuous casting in the b step
Base soaking temperature is 1220~1240 DEG C.
4. a kind of preparation method of high strength rolled steel according to claim 2, it is characterised in that：Roughing in the step c
Workpiece thickness is 38~48mm afterwards, and finishing temperature is 800~840 DEG C.
5. a kind of preparation method of high strength rolled steel according to claim 2, it is characterised in that：Rolled in the Step d
The cooling velocity of slab afterwards is 20~27 DEG C/s, and air cooling time is 9s, and final cooling temperature is 360~410 DEG C.
6. a kind of high strength rolled steel described in claim 1 is used for the purposes of automobile bodies steel.
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| 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 |
Citations (4)
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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- 2015-07-10 CN CN201510401643.1A patent/CN104962807B/en active Active
Patent Citations (4)
| 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 |
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