CN105506476A - 600 MPa-grade highly-chambered steel plate for automotive chassis and manufacturing method thereof - Google Patents
600 MPa-grade highly-chambered steel plate for automotive chassis and manufacturing method thereof Download PDFInfo
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- CN105506476A CN105506476A CN201410505791.3A CN201410505791A CN105506476A CN 105506476 A CN105506476 A CN 105506476A CN 201410505791 A CN201410505791 A CN 201410505791A CN 105506476 A CN105506476 A CN 105506476A
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Abstract
The invention provides a 600 MPa-grade highly-chambered steel plate for automotive chassis. Steel of the steel plate is composed of, in percentage by weight, 0.04-0.10% of C, Si smaller than 0.70%, 1.0-1.6% of Mn, 0.02-0.08% of Als, 0.01-0.05% of Nb, P smaller than 0.015%, S smaller than 0.005% and the balance Fe and inevitable impurities. The invention further provides a manufacturing method of the steel plate. The method comprises the steps of heating continuous casting sheet billets with the thickness ranging from 80 mm to 230 mm to 1220+/-20 DEG C, and preserving the temperature for 1.8-3 hours; carrying out two-stage rolling, wherein the rolling temperature of the recrystallizing region is higher than 1050 DEG C, the thickness of intermediate billets ranges from 35 mm to 60 mm, the finish rolling temperature of the non-recrystallizing region ranges from 840 DEG C to 920 DEG C, and the thickness of finished products ranges from 2.0 mm to 6.0 mm; carrying out continuous laminar flow cooling after finish rolling, wherein the cooling rate is 20-40 DEG C/s and the coiling temperature ranges from 450 DEG C to 580 DEG C. According to the invention, the steel plate is high in alloy content and low in cost, the hot rolling process is simple, the rolling performance of the steel plate is uniform, and the matching performance between the strength and the hole chambering rate is good.
Description
Technical field
The invention belongs to steel rolling field, particularly relate to hot rolling high-chambering steel plate and manufacture method thereof that a kind of tensile strength of producing on CSP tandem rolling line reaches 600MPa level.
Background technology
In recent years, along with the fast development of automotive industry, automobile is also strict all the more to the requirement of ferrous materials, while improving the requirement of strength of ferrous materials, also must ensure the workability of steel under high strength condition, meet the particular requirement of respective auto parts to processing characteristics simultaneously.As the important component part of vehicle, automotive chassis components due to complex-shaped, and needs to carry out to comprise the forming modes such as stretch flanging, bending, reaming in the fabrication process, and therefore to the plasticity of steel plate, especially reaming performance proposes higher requirement.Under such condition, the hot rolling high-chambering steel with excellent reaming performance obtains the extensive concern of car manufactures.Compared with the high-strength low-alloy steel of same level, high reaming steel, except having good reaming performance, also has good intensity-feature such as fatigue property cooperation, high strain-hardening index (n value), high breaking elongation, wide market.
" a kind of tensile strength is 590MPa level hot rolling high-chambering steel plate and manufacturing process thereof " (CN101928881A), disclose high-chambering steel plate composition and adopt low-carbon (LC), high silicon, component system containing a small amount of niobium vanadium, hot rolling technology adopts two-stage control rolling, sub-sectional cooling technique is adopted after finish to gauge, the hot-rolled steel sheet excellent property obtained, tensile strength is greater than 590MPa, and hole expansibility is higher than 75%.Its weak point is hot rolling technology, and especially process for cooling is complicated, is difficult to accurate control, is unfavorable for the steel plate obtaining stable performance on continuous casting and rolling production line.
" a kind of tensile strength is 440MPa level hot rolling high-chambering steel plate and manufacture method thereof " (CN101353757A), disclosed steel plate steel plate composition is: C:0.01-0.06%, Si:0-0.6%, Mn:0.8-1.3%, P≤0.035%, Nb:0-0.25%, Al:0.025-0.06%, Ti≤0.030%, Ca≤0.005%, all the other are Fe and inevitable impurity, hot rolling adopts two-stage control rolling, and coiling temperature is higher, is 560 DEG C-660 DEG C, the tensile strength of hot-rolled steel sheet is higher than 440MPa, and hole expansibility is higher than 75%.
" a kind of hot rolling high-chambering steel " (JP2006063394), the carbon content disclosing high reaming steel is 0.2-0.48%, and tensile strength is greater than 440MPa, and its weak point is, hole expansibility only higher than 70%, and also need carry out anneal at 640 DEG C after hot rolling.
" a kind of 780MPa level hot rolling high-chambering steel " (US2006096678), the microstructure of disclosed high reaming steel steel plate is made up of ferrite and bainite, tensile strength reaches 780MPa level, hole expansibility >=60%, but containing a certain amount of precious metal molybdenum in the composition of steel plate, cost is higher.
The present invention proposes a kind of low cost, be easy to produce on CSP tandem rolling line and there is 600MPa level hot rolling high-chambering steel plate and the manufacture method thereof of excellent mechanical performances and reaming performance.
Summary of the invention
The object of the invention is to overcome the problems referred to above and not enough and provide a kind of low cost, be easy to produce on CSP tandem rolling line and have 600MPa level hot rolling high-chambering steel plate and the manufacture method thereof of excellent mechanical performances and reaming performance, this steel plate is particularly suitable for the automotive chassis components manufacturing complicated shape.
The present invention seeks to realize like this:
Automobile chassis 600MPa level high-chambering steel plate, the composition of this steel is as follows by weight percentage: C0.04-0.10%, Si<0.70%, Mn1.0-1.6%, Als0.02-0.08%, Nb0.01-0.05%, P<0.015%, S<0.005%, surplus is Fe and inevitable impurity.
Steel plate be finally organized as ferrite and bainite, wherein ferrite volume fraction is 70%-90%, and bainite volume fraction is 10%-30%.
The tensile strength of steel plate is greater than 600MPa, and yield strength is greater than 440MPa, and unit elongation is higher than 25%, and hole expansibility is higher than 80%.
Composition Design reason is as follows:
C: carbon is topmost solution strengthening element in steel is the guarantee of steel strength.Consider weldability, plasticity etc., carbon content can not be too high, and carbon content is too low, and the intensity of steel plate can be made to reduce, and in the present invention, the span of control of carbon is 0.04-0.10%.
Si: silicon is ferrite former, can accelerate austenite to ferritic transformation, promote ferritic formation; Meanwhile, Si also plays admittedly molten strengthening effect, improves the intensity of steel plate.But silicon too high in steel can make hot rolled sheet metal surface quality deteriorated.In the present invention, the span of control of silicon is Si<0.70%.
Mn: manganese plays solution strengthening effect, can postpone perlitic transformation.But Fe content is too high, while postponement perlitic transformation, also postpones ferritic precipitation, reduce the plasticity of steel plate, otherwise easily occur perlite in tissue.Therefore, in the present invention, Fe content is 1.0%-1.60%.
Als: aluminium is the deoxidant element in steel, reduces oxide inclusion, the pure steel in steel, and be conducive to the forming property improving steel plate, therefore Als controls at 0.02-0.08%.
P, S: p and s is impurity element in the present invention, should be more low better.
Nb: the niobium of solid solution condition can suppress Static and dynamic recrystallize in thermal deformation process, improves recrystallize final temperature, increases the Strain Accumulation of continuous rolling process posterior part frame, promotes that austenite is to ferritic transformation, and makes ferrite crystal grain obtain refinement.Niobium is combined with carbon and nitrogen and forms little carbonitride and also can postpone recrystallize, stops Austenite Grain Growth, and has obvious refined crystalline strengthening effect.But the too high meeting of content of niobium has a negative impact to ferrite transformation, therefore in the present invention the optimized scope of content of niobium between 0.01-0.05%.
The present invention adopts above chemical composition, produces automobile chassis 600MPa level high-chambering steel plate by medium thin slab continuous casting and rolling line, and its manufacture method comprises smelting, continuous casting, heating, rolling, cooling, curling.
(1) heating process: continuous casting steel billet thick for 80-230mm is heated to 1220 ± 20 DEG C in walking beam furnace, and is incubated 1.8-3 hour; Higher Heating temperature and suitable soaking time make the complete solid solution of slab interalloy element, slab uniform composition, and play effect such as control original austenite grains size and save energy etc.
(2) rolling technology: adopt two-stage control rolling, recrystallization zone rolling temperature is greater than 1050 DEG C, and workpiece thickness is 35-60mm, and Unhydrated cement finishing temperature is 840-920 DEG C, and finished product thickness is 2.0-6.0mm; Higher recrystallization zone rolling temperature and larger draught make original austenite grains obtain refinement; Unhydrated cement phase temperature is unsuitable too high, and lower temperature and larger distortion are conducive to austenite to ferritic transformation.
(3) process for cooling: adopt continuous section cooling after finish to gauge, rate of cooling is 20-40 DEG C/s; Continuous print laminar flow cooling technology makes ferrite crystal grain separate out fast in a large number, while suppression ferrite crystal grain is grown up, also makes ferritic content be guaranteed, simplifies process for cooling simultaneously.In process of cooling, rate of cooling is excessively slow, easily occurs perlite in tissue, otherwise in steel plate tissue, ferritic content does not reach requirement.
(4) coiling temperature: coiling temperature is 450-580 DEG C.Easily there is perlite in the too high tissue of coiling temperature, in the too low tissue of coiling temperature, there will be martensitic stucture.
Beneficial effect of the present invention is:
(1), the composition interalloy content of steel plate is less, and cost is low, and hot rolling technology is simple, is easy to large-scale commercial production;
(2), adopt continuous coo1ing technique after finish to gauge, process for cooling is simplified, improve the homogeneity that steel plate leads to volume performance simultaneously;
(3), the good mechanical performance of steel plate that obtains, there is good intensity and hole expansibility coupling, be particularly suitable for making complex-shaped automotive chassis components.
Embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention, according to the component proportion of technical scheme, carries out smelting, continuous casting, heating, rolling, cooling, curling.
It is that the continuously cast bloom of 80-230mm is heated to 1220 ± 20 DEG C that manufacture method is specially thickness, be incubated and on medium thin slab continuous casting and rolling production line, carry out two benches controlled rolling after 1.8-3 hour, recrystallization zone rolling temperature is greater than 1050 DEG C, workpiece thickness is 35-60mm, and Unhydrated cement finishing temperature is 840-920 DEG C.Adopt continuous coo1ing after finish to gauge, rate of cooling is 20-40 DEG C/s, and coiling temperature is 450-580 DEG C, and finished product thickness is 2.0-6.0mm.The chemical composition of embodiment of the present invention steel is in table 1.The temperature schedule parameter of embodiment of the present invention steel is in table 2.The tissue of embodiment of the present invention steel and mechanical property are in table 3.
The chemical composition (wt, %) of table 1 embodiment of the present invention
The temperature schedule parameter of table 2 embodiment of the present invention steel
The tissue of table 3 embodiment of the present invention steel and mechanical property
Claims (3)
1. automobile chassis 600MPa level high-chambering steel plate, it is characterized in that, the composition of this steel is as follows by weight percentage: C0.04%-0.10%, Si<0.70%, Mn1.0%-1.6%, Als0.02%-0.08%, Nb0.01%-0.05%, P<0.015%, S<0.005%, surplus is Fe and inevitable impurity.
2. automobile chassis 600MPa level high-chambering steel plate according to claim 1, is characterized in that, steel plate be finally organized as ferrite and bainite, wherein ferrite volume fraction is 70%-90%, and bainite volume fraction is 10%-30%.
3. the manufacture method for 600MPa level hot rolling hole steel plate of the automobile chassis described in claim 1 or 2, comprises smelting, continuous casting, heating, rolling, cooling, curling, it is characterized in that:
(1) heating process: continuous casting steel billet thick for 80-230mm is heated to 1220 ± 20 DEG C in walking beam furnace, and is incubated 1.8-3 hour;
(2) rolling technology: adopt two-stage control rolling, recrystallization zone rolling temperature is greater than 1050 DEG C, and workpiece thickness is 35-60mm, and Unhydrated cement finishing temperature is 840-920 DEG C, and finished product thickness is 2.0-6.0mm;
(3) process for cooling: adopt continuous section cooling after finish to gauge, rate of cooling is 20-40 DEG C/s;
(4) batch: coiling temperature is 450-580 DEG C.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106399830A (en) * | 2016-10-14 | 2017-02-15 | 武汉钢铁股份有限公司 | High hole expanding steel with stable hole expanding performance and production method thereof |
| CN108998739A (en) * | 2018-08-01 | 2018-12-14 | 首钢集团有限公司 | A kind of hot rolling acid-cleaning strip and its production method with high reaming performance |
| CN109536845A (en) * | 2019-02-01 | 2019-03-29 | 本钢板材股份有限公司 | A kind of tensile strength 590MPa grades of wheels hot-rolled ferrite-bainite dual-phase steel steel band and preparation method thereof |
| CN109898016A (en) * | 2019-03-01 | 2019-06-18 | 鞍钢股份有限公司 | 500MPa grades or more high reaming hot rolling acid-cleaning steel plate and its manufacturing method |
| CN110669989A (en) * | 2019-09-30 | 2020-01-10 | 鞍钢股份有限公司 | High-elongation steel for automobile axle housing for cold stamping and production method thereof |
| CN112522597A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | Boron-containing high-reaming-hole steel and production method thereof |
| CN116640995A (en) * | 2023-05-31 | 2023-08-25 | 武汉钢铁有限公司 | Thin-specification high-precision 440 MPa-grade high-reaming acid-washing automobile steel and production method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106399830A (en) * | 2016-10-14 | 2017-02-15 | 武汉钢铁股份有限公司 | High hole expanding steel with stable hole expanding performance and production method thereof |
| CN108998739A (en) * | 2018-08-01 | 2018-12-14 | 首钢集团有限公司 | A kind of hot rolling acid-cleaning strip and its production method with high reaming performance |
| CN109536845A (en) * | 2019-02-01 | 2019-03-29 | 本钢板材股份有限公司 | A kind of tensile strength 590MPa grades of wheels hot-rolled ferrite-bainite dual-phase steel steel band and preparation method thereof |
| CN109898016A (en) * | 2019-03-01 | 2019-06-18 | 鞍钢股份有限公司 | 500MPa grades or more high reaming hot rolling acid-cleaning steel plate and its manufacturing method |
| CN112522597A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | Boron-containing high-reaming-hole steel and production method thereof |
| CN110669989A (en) * | 2019-09-30 | 2020-01-10 | 鞍钢股份有限公司 | High-elongation steel for automobile axle housing for cold stamping and production method thereof |
| CN116640995A (en) * | 2023-05-31 | 2023-08-25 | 武汉钢铁有限公司 | Thin-specification high-precision 440 MPa-grade high-reaming acid-washing automobile steel and production method thereof |
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