CN102839329A - Cold-rolling double-phase-steel steel plate with tensile strength of 450 MPa, and preparation method thereof - Google Patents
Cold-rolling double-phase-steel steel plate with tensile strength of 450 MPa, and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a cold-rolling double-phase-steel steel plate with a tensile strength of 450 MPa, and a preparation method thereof. The mass percentages of chemical components of the double-phase-steel are as follows: 0.03-0.06% of C, 0.2-0.3% of Si, 1.4-1.6% of Mn, 0.1-0.3% of Cr, 0.003-0.020% of Ti, 0.020-0.060% of Al, P <= 0.01%, S <= 0.010%, and the balance being Fe and inevitable impurities. Compared with a conventional method, the high-strength cold-rolling double-phase-steel steel plate used for automobiles has a yield strength of 200 MPa-250 MPa, the a tensile strength of 450 MPa-500 MPa and an elongation of 26%-32%.
Description
Technical field
The invention belongs to dual phase steel and preparation method thereof, belong to tensile strength 450MPa level cold-rolled biphase steel steel plate and preparation method thereof especially.
Background technology
The exploitation of high tensile steel plate adapts to conservation-minded society's Development Trend, is the current and even later important development direction of ferrous materials.Dual phase steel has obtained using widely in automobile industry owing to have higher intensity, good ductility, low yield strength ratio, high initial manufacture hardening rate and welding property preferably.At present domestic and international iron and steel enterprise has all carried out the exploitation of the dual phase steel of different stage.
The application achievements of cold-rolled biphase steel on automobile ultra light steel automotive body-advanced concept car shows; With dual phase steel substitute behind original steel loss of weight, energy-conservation, improve security, reduce aspects such as discharging and all represented wide prospect, the development trend that the while has also been indicated automobile-used steel plate.
The exploitation of low grade cold rolling dual phase steel has great importance, and aspect replacement low-alloy high-strength steel, high-strength IF steel and the dual phase steel seriation outstanding effect is being arranged.In the automobile structure application facet; Compare low-alloy high-strength steel, mainly contain following advantage: initial yield-point is low, the initial manufacture hardening rate high, and yield tensile ratio is low; Has good intensity and ductility coupling; Better strain hardenability, high bump energy-absorbing and good dent resistance need not add precious metal Nb simultaneously, can reduce cost; Compare structural carbon steel; Its advantage: have HS, H.T.; Promptly have good intensity and toughness and cooperate, have, have good welding property, high baking and hardening performance and bump energy-absorbing than low yield strength ratio, higher unit elongation and very high initial manufacture cementation index.In the automobile panel application facet, compare baking hardened steel, mainly contain following advantage: ageing resistance stability is better; Guarantee the high-intensity while, baking and hardening performance is higher, under other prerequisite of same intensity level; The DP steel plate is thinner, and more obvious for automobile lightweight weight loss effect, the initial manufacture hardening rate of dual phase steel is higher simultaneously; Having higher yield strength after the shaping, make part have dent resistance ability preferably, is the ideal material of automobile panel.Therefore 450MPa level cold-rolled biphase steel is that automobile lightweight Abdeckteil also is the best selection of automobile ordinary construction spare with the best materials of steel simultaneously in the future.For other cold-rolled biphase steel of 450MPa level, relevant report data not also both at home and abroad at present.
Summary of the invention
The 1st technical problem to be solved by this invention provides the automobile cold-rolled dual phase steel steel plate of a kind of tensile strength 450MPa level.
The 2nd technical problem to be solved by this invention is the preparation method of above-mentioned steel plate.
The technical scheme of technical solution problem of the present invention is: the automobile cold-rolled dual phase steel steel plate of a kind of tensile strength 450MPa level; Its chemical ingredients mass percent is: C:0.03-0.06%, Si:0.2-0.3%, Mn:1.4-1.6%, Cr:0.1 ~ 0.3%, Ti:0.003 ~ 0.020%; Als:0.020-0.060%, P≤0.01%, S≤0.01%, surplus are Fe and unavoidable impurities.
Preparing method of the present invention may further comprise the steps successively:
(1) smelts and solidify: be applicable to converter, electric furnace and induction furnace smelting, adopt continuous casting to produce strand or die casting production ingot casting;
(2) hot continuous rolling of strand or ingot casting: with 1100 ~ 1250 ℃ of heating of strand warp; It is rolling to carry out the 5-20 passage by roughing mill; Hot rolling is to 30-50mm thickness specification, and it is rolling to carry out the 5-7 passage by the hot continuous rolling unit, in 500-700 ℃ of scope, coils into coil of strip after being rolled to target thickness;
(3) pickling and cold-rolling: hot rolled strip through the pickling of salt acid tank, behind the removal scale on surface, is carried out cold continuous rolling or cold rolling, and cold rolling draft is 50 ~ 75%, is rolled to target thickness.
(4) continuous annealing: the steel plate that the pickling and cold-rolling step process is good; After earlier slowly being heated to 170 ℃; Be rapidly heated to 760 ~ 800 ℃, also can directly be rapidly heated, insulation 90 ~ 120s to 760 ~ 800 ℃; Be chilled to the speed of 5 ~ 7 ℃/s that the speed of cooling with 45-60 ℃/s is quickly cooled at 290 ~ 320 ℃ after 650 ~ 680 ℃, overaging is chilled to room temperature after handling 300 ~ 500s.
Described slow heating, promptly the speed with 5-15 ℃/s heats.
Described being rapidly heated is meant with the process furnace peak power and heats up.
Among the present invention:
C: the most effective strengthening element is to form martensitic principal element, and carbon content has determined the intensity and the martensitic pattern of dual phase steel in the steel; But, guarantee to have good welding property and higher unit elongation, when especially being applied to Abdeckteil and needing higher flange flange performance, requires lower carbon content, so the weight percent of C is controlled at 0.03-0.06% and hangs down scope among the present invention.
Si: ferritic solution strengthening element, quicken carbon and gather partially to austenitic, the solid solution carbon in the ferritic is had remove and Water purification, help to improve the ductility of dual phase steel.But, reduce the silicone content in the steel, so Si weight percentage of the present invention is controlled at 0.2-0.3% for fear of because of the Si too high levels influences plate surface quality at the refractory oxide that surface of steel plate forms as far as possible.
Mn: belong to typical stabilization of austenite and learn element, can significantly improve the hardening capacity of steel, and play the effect of solution strengthening and refinement ferrite crystal grain, can significantly postpone perlitic transformation and bainite transformation.But Mn when high manganese content is postponed perlitic transformation, also can postpone ferritic separating out as the element that enlarges the austenitic area; And the too low perlitic transformation that causes easily of manganese content, so Mn weight percent content of the present invention is controlled at 1.4～1.6%.
Cr: middle strong carbide forming element, significantly improve the hardening capacity of steel, can postpone perlitic transformation and bainite transformation strongly, and enlarge and batch window.Though Cr is weak solution strengthening element, can increase austenitic cold energy power excessively, thereby thinning microstructure plays strengthening effect.An amount of interpolation of Cr simultaneously can reduce the yield tensile ratio of dual phase steel, improves martensitic distribution, and then improves unit elongation; But too high Cr content can make the hardening capacity of steel improve greatly, thereby intensity is increased greatly, has worsened the plasticity and the weldableness of steel.Therefore preferable Cr content should be controlled in 0.1 ~ 0.30%.
Als:Al role in dual phase steel is similar with Si, and while Al also can form AlN and separate out, and plays the effect of certain crystal grain thinning.The existence of a small amount of Al under the prerequisite of proof strength performance, can make the extension property of dual phase steel improve.So Al weight percent content of the present invention is controlled at 0.020%-0.060%.
P, S: detrimental impurity is to the detrimentally affect of the punching performance of steel in the steel in order to reduce, and the P in the steel, the content of S are controlled in strictness.
Ti: the precipitation strength element, ferrite matrix there is strengthening effect, help to improve ferritic intensity, reduce the intensity difference of ferritic and martensitic stucture, thereby improve the flange extension property of steel.But for fear of because of the Ti too high levels; Make its thermal conductivity descend and influence the surface quality in the strand and the course of processing thereof; Too high Ti content also forms a large amount of inclusiones simultaneously, so Ti weight percentage of the present invention is controlled at smaller or equal to 0.003 ~ 0.020%.
Principal feature of the present invention: because Si content is suitable in the composition design, help separating out of solid solution carbon in the ferritic, purify ferritic, improved the ductility of dual phase steel.Yield tensile ratio is low, and highly malleablized matches, and punching performance is good, and the initial manufacture cementation index is high, and the present invention do not use alloying element, improves the comprehensive mechanical property of two-phase greatly, and has reduced cost.Simultaneously few C content with a spot of Ti content of interpolation, improves its flange flanging forming performance greatly, can the using vehicle Abdeckteil.
The present invention compared with prior art, the automobile high-strength cold-rolled biphase steel plate of being produced, ys is 200MPa ~ 250MPa, tensile strength is 440MPa ~ 500MPa, unit elongation is 26%～32%.
Embodiment
Below in conjunction with embodiment the present invention is done detailed explanation.
Embodiment 1:
The chemical ingredients of steel (mass percent) C:0.03%, Mn:1.6%, Si:0.21%, Cr:0.28%, Ti:0.0035%, Als:0.02%, surplus is iron and unavoidable impurities.
Its preparation technology is:
(1) smelts and solidify: be applicable to converter, electric furnace and induction furnace smelting, adopt continuous casting to produce strand or die casting production ingot casting;
(2) hot continuous rolling of strand or ingot casting: with 1100 ~ 1250 ℃ of heating of strand warp; It is rolling to carry out the 5-20 passage by roughing mill; Hot rolling is to 30-50mm thickness specification, and it is rolling to carry out the 5-7 passage by the hot continuous rolling unit, in 500-700 ℃ of scope, coils into coil of strip after being rolled to target thickness;
(3) pickling and cold-rolling: hot rolled strip through the pickling of salt acid tank, behind the removal scale on surface, is carried out cold continuous rolling or cold rolling, and cold rolling draft is 50 ~ 75%, is rolled to target thickness.
(4) continuous annealing:
Sample after acid rolled; Adopt Multipas continuous annealing sm simulation continuous annealing process; After earlier slowly being heated to 170 ℃, be rapidly heated insulation 120s to 800 ℃; Be chilled to the speed of 6.5 ℃/s that the speed of cooling with 50 ℃/s is quickly cooled at 320 ℃ after 680 ℃, overaging is chilled to room temperature after handling 480s.The cold-rolled biphase steel panel products ys that obtains is 220MPa, tensile strength 455MPa, and unit elongation 32%, the n value is 0.22.
Embodiment 2:
The chemical ingredients of steel (mass percent) C:0.045%, Mn:1.5%, Si:0.26%, Cr:0.20%, Ti:0.01%, the Als:0.04% surplus is iron and unavoidable impurities.
Its preparation method is except that annealing process, and all the other are identical with embodiment 1.
Sample after acid rolled; Adopt Multipas continuous annealing sm simulation continuous annealing process; After earlier slowly being heated to 170 ℃, be rapidly heated insulation 100s to 780 ℃; Be chilled to the speed of 5 ℃/s that the speed of cooling with 60 ℃/s is quickly cooled at 290 ℃ after 660 ℃, overaging is chilled to room temperature after handling 360s.The cold-rolled biphase steel panel products ys that obtains is 230MPa, tensile strength 465MPa, and unit elongation 30%, the n value is 0.22.
Embodiment 3: the chemical ingredients of steel (mass percent) C:0.055%, and Mn:1.45%, Si:0.28%, Cr:0.25%, Ti:0.015%, the Als:0.04% surplus is iron and unavoidable impurities.
Its preparation method is except that annealing process, and all the other are identical with embodiment 1.
Slowly after being heated to 170 ℃, be rapidly heated to 760 ℃, insulation 90s is chilled to the speed of 5.5 ℃/s that the speed of cooling with 45 ℃/s is quickly cooled at 290 ℃ after 650 ℃, and overaging is chilled to room temperature after handling 360s.The cold-rolled biphase steel panel products ys that obtains is 235MPa, tensile strength 485MPa, and unit elongation 29%, the n value is 0.21.
Embodiment 4: the chemical ingredients of steel (mass percent) C:0.06%, and Mn:1.40%, Si:0.28%, Cr:0.10%, Ti:0.018%, the Als:0.06% surplus is iron and unavoidable impurities.
Its preparation method is except that annealing process, and all the other are identical with embodiment 1.
Sample after acid rolled; Adopt Multipas continuous annealing sm simulation continuous annealing process; After earlier slowly being heated to 170 ℃, be rapidly heated insulation 90s to 760 ℃; Be chilled to the speed of 7.0 ℃/s that the speed of cooling with 45 ℃/s is quickly cooled at 290 ℃ after 650 ℃, overaging is chilled to room temperature after handling 360s.The cold-rolled biphase steel panel products ys that obtains is 245MPa, tensile strength 495MPa, and unit elongation 26%, the n value is 0.21.
Claims (5)
1. automobile cold-rolled dual phase steel steel plate of tensile strength 450MPa level; Its chemical ingredients mass percent is: C:0.03-0.06%, Si:0.2-0.3%, Mn:1.4-1.6%, Cr:0.1 ~ 0.3%, Ti:0.003 ~ 0.020%; Als:0.020-0.060%, P≤0.01%, S≤0.01%, surplus are Fe and unavoidable impurities.
2. this preparation method of the automobile cold-rolled dual phase steel steel plate of the described tensile strength 450MPa level of claim 1 may further comprise the steps successively:
(1) smelts and solidify: be applicable to converter, electric furnace and induction furnace smelting, adopt continuous casting to produce strand or die casting production ingot casting;
(2) hot continuous rolling of strand or ingot casting: with strand through 1100-1250 ℃ of heating; It is rolling to carry out the 5-20 passage by roughing mill; Hot rolling is to 30-50mm thickness specification, and it is rolling to carry out the 5-7 passage by the hot continuous rolling unit, in 500-700 ℃ of scope, coils into coil of strip after being rolled to target thickness;
(3) pickling and cold-rolling: hot rolled strip through the pickling of salt acid tank, behind the removal scale on surface, is carried out cold continuous rolling or cold rolling, and cold rolling draft is 50 ~ 75%, is rolled to target thickness;
(4) continuous annealing: the steel plate that the pickling and cold-rolling step process is good; After earlier slowly being heated to 170 ℃; Be rapidly heated to 760-800 ℃; Insulation 90-120s is chilled to the speed of 5-7 ℃/s that the speed of cooling with 45-60 ℃/s is cooled at 290-320 ℃ after 650-680 ℃, and overaging is chilled to room temperature after handling 300-500s.
3. the automobile cold-rolled dual phase steel steel plate of tensile strength 450MPa level according to claim 2 preparation method originally is characterized in that:
Described slow heating, promptly the speed with 5-15 ℃/s heats;
Described being rapidly heated is meant with the process furnace peak power and heats up.
4. this preparation method of the automobile cold-rolled dual phase steel steel plate of the described tensile strength 450MPa level of claim 1 may further comprise the steps successively:
(1) smelts and solidify: be applicable to converter, electric furnace and induction furnace smelting, adopt continuous casting to produce strand or die casting production ingot casting;
(2) hot continuous rolling of strand or ingot casting: with strand through 1100-1250 ℃ of heating; It is rolling to carry out the 5-20 passage by roughing mill; Hot rolling is to 30-50mm thickness specification, and it is rolling to carry out the 5-7 passage by the hot continuous rolling unit, in 500-700 ℃ of scope, coils into coil of strip after being rolled to target thickness;
(3) pickling and cold-rolling: hot rolled strip through the pickling of salt acid tank, behind the removal scale on surface, is carried out cold continuous rolling or cold rolling, and cold rolling draft is 50 ~ 75%, is rolled to target thickness;
(4) continuous annealing: the steel plate that the pickling and cold-rolling step process is good; Be rapidly heated to 760-800 ℃; Insulation 90-120s is chilled to the speed of 5-7 ℃/s that the speed of cooling with 45-60 ℃/s is cooled at 290-320 ℃ after 650-680 ℃, and overaging is chilled to room temperature after handling 300-500s.
5. the automobile cold-rolled dual phase steel steel plate of tensile strength 450MPa level according to claim 4 preparation method originally is characterized in that:
Described being rapidly heated is meant with the process furnace peak power and heats up.
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| CN103131843A (en) * | 2013-01-02 | 2013-06-05 | 河北钢铁股份有限公司邯郸分公司 | Stabilization continuous annealing process of low-alloy and high-strength steel cold-rolled sheet used for automobile structural components |
| CN103305762A (en) * | 2013-06-21 | 2013-09-18 | 安徽工业大学 | Cold-rolled dual-phase sheet steel with 400MPa-level tensile strength and preparation method thereof |
| CN103469089A (en) * | 2013-09-11 | 2013-12-25 | 马鞍山市安工大工业技术研究院有限公司 | Cake-shaped crystal grain deep-draw double-phase steel plate and preparation method thereof |
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| CN103131843A (en) * | 2013-01-02 | 2013-06-05 | 河北钢铁股份有限公司邯郸分公司 | Stabilization continuous annealing process of low-alloy and high-strength steel cold-rolled sheet used for automobile structural components |
| CN103305762A (en) * | 2013-06-21 | 2013-09-18 | 安徽工业大学 | Cold-rolled dual-phase sheet steel with 400MPa-level tensile strength and preparation method thereof |
| CN104419878A (en) * | 2013-09-05 | 2015-03-18 | 鞍钢股份有限公司 | Ultrahigh-strength cold-rolled dual-phase steel with weather resistance and manufacturing method thereof |
| CN103469089A (en) * | 2013-09-11 | 2013-12-25 | 马鞍山市安工大工业技术研究院有限公司 | Cake-shaped crystal grain deep-draw double-phase steel plate and preparation method thereof |
| CN103469089B (en) * | 2013-09-11 | 2016-01-27 | 马鞍山市安工大工业技术研究院有限公司 | A kind of cheese crystal grain deep-draw dual phase sheet steel and preparation method thereof |
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| CN107557679A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | Light austenitic steel with good strong plasticity and production method thereof |
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| CN109957715A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | Steel sheet for hot forming, method for producing same, hot forming method, and member produced thereby |
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| CN109943765B (en) * | 2019-04-30 | 2021-06-22 | 马鞍山钢铁股份有限公司 | 800 MPa-grade cold-rolled dual-phase steel with high yield ratio and preparation method thereof |
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| CN115181890B (en) * | 2021-04-02 | 2023-09-12 | 宝山钢铁股份有限公司 | 1180 MPa-level low-carbon low-alloy dual-phase steel and rapid heat treatment manufacturing method |
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