CN102839329B - 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 preparation method of a cold-rolling double-phase-steel steel plate with a tensile strength of 450 MPa. 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 especially the preparation method of the automobile cold-rolled dual phase sheet steel of tensile strength 450MPa level.
Background technology
The exploitation of high tensile steel plate adapts to the trend of conservation-minded society's development, is the current and even later important development direction of ferrous materials.Dual phase steel, owing to having higher intensity, good ductility, low yield strength ratio, high initial manufacture hardening rate and welding property preferably, is widely used in automobile industry.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 after original steel loss of weight, energy-conservation, improve security, reduce the aspects such as discharge and all represented wide prospect, the development trend that the while has also been indicated automobile steel sheet.
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 dual phase steel seriation, is having outstanding effect.In automobile structure application aspect, compare low-alloy high-strength steel, mainly have the following advantages: initial yield-point is low, initial manufacture hardening rate is high, yield tensile ratio is low, there is good strength and ductility coupling, better strain hardenability, high impact energy absorption and good dent resistance, do not need to add precious metal Nb simultaneously, can reduce costs; Compare structural carbon steel, its advantage: there is high strength, high tenacity, there is good intensity and toughness and coordinate, have compared with low yield strength ratio, higher unit elongation and very high initial manufacture cementation index, there is good welding property, high baking and hardening performance and impact energy absorption.In automobile panel application aspect, compare baking hardened steel, mainly have the following advantages: ageing resistance stability is better, ensure the high-intensity while, baking and hardening performance is higher, under the prerequisite of same intensity rank, DP steel plate is thinner, for automotive light weight technology weight loss effect more obvious, the initial manufacture hardening rate of dual phase steel is higher simultaneously, after shaping, having higher yield strength, make part have good dent resistance energy, is the ideal material of automobile panel.Therefore 450MPa level cold-rolled biphase steel is the best materials of automotive light weight technology Abdeckteil steel in future, is also the best selection of automobile ordinary construction part simultaneously.For the cold-rolled biphase steel of 450MPa rank, 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 is to provide the automobile cold-rolled dual phase sheet steel 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 sheet steel of a kind of tensile strength 450MPa level, its chemical composition 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 is Fe and inevitable impurity.
Preparation method of the present invention, comprises the following steps successively:
(1) smelt and solidify: being applicable to converter, electric furnace and induction furnace and smelting, adopt continuous casting to produce strand or die casting production ingot casting;
(2) hot continuous rolling of strand or ingot casting: by strand through 1100～1250 DEG C of heating, carry out the rolling of 5-20 passage by roughing mill, hot rolling to 30-50mm thickness specification, is carried out the rolling of 5-7 passage by hot continuous rolling unit, coils into coil of strip after being rolled to target thickness within the scope of 500-700 DEG C;
(3) pickling and cold-rolling: hot rolled strip, through hydrochloric acid trough pickling, is removed after scale on surface, carried out cold continuous rolling or cold rolling, cold rolling draft is 50～75%, is rolled to target thickness.
(4) continuous annealing: by the good steel plate of pickling and cold-rolling step process, first slowly be heated to after 170 DEG C, be rapidly heated to 760～800 DEG C, also can directly be rapidly heated to 760～800 DEG C, insulation 90～120s, be chilled to after 650～680 DEG C and be quickly cooled at 290～320 DEG C with the speed of cooling of 45-60 DEG C/s with the speed of 5～7 DEG C/s, overaging is chilled to room temperature after processing 300～500s.
Described slow heating, heats with the speed of 5-15 DEG C/s.
Described being rapidly heated refers to process furnace peak power and heats up.
In the present invention:
C: the most effective strengthening element is to form martensitic principal element, and in steel, carbon content has determined intensity and the martensitic pattern of dual phase steel; But, ensure to there is good welding property and higher unit elongation, when being especially applied to Abdeckteil and needing higher flange flange performance, require lower carbon content, so the weight percent of C is controlled at the lower scope of 0.03-0.06% in the present invention.
Si: ferritic solution strengthening element, accelerate carbon to austenitic segregation, the solid solution carbon in ferrite is had and removed and cleaning action, contribute to improve the ductility of dual phase steel.But affect plate surface quality for fear of the refractory oxide forming at surface of steel plate because of Si too high levels, reduce the silicone content in steel, so Si weight percentage of the present invention is controlled at 0.2-0.3% 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, as the element that expands austenitic area, in the time that high manganese content is postponed perlitic transformation, also can postpone ferritic separating out; And the too low perlitic transformation that easily causes of manganese content, so Mn weight percent content of the present invention is controlled at 1.4～1.6%.
Cr: middle carbide, significantly improve the hardening capacity of steel, can strongly postpone perlitic transformation and bainite transformation, and expand and batch window.Though Cr is weak solution strengthening element, can increase austenitic cold energy power excessively, thereby thinning microstructure plays strengthening effect.The simultaneously appropriate interpolation of Cr, 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 greatly improve, thereby intensity is increased greatly, has worsened plasticity and the weldability of steel.Therefore preferably Cr content should be controlled in 0.1～0.30%.
Als:Al role in dual phase steel is similar to 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: for reducing the detrimentally affect of the punching performance of detrimental impurity to steel in steel, strictly control the P in steel, the content of S.
Ti: precipitation strength element, ferrite matrix is had to strengthening effect, contribute to improve ferritic intensity, reduce the intensity difference of ferrite and martensitic stucture, thereby improve the flange extension property of steel.But for fear of because of Ti too high levels, its thermal conductivity is declined and affect the surface quality in strand and the course of processing thereof, too high Ti content also forms a large amount of inclusiones simultaneously, is less than or equal to 0.003～0.020% so Ti weight percentage of the present invention is controlled at.
Principal feature of the present invention: because Si content in Composition Design is suitable, contribute to separating out of solid solution carbon in ferrite, purify ferrite, improved the ductility of dual phase steel.Yield tensile ratio is low, and highly malleablized matches, and punching performance is good, and initial manufacture cementation index is high, and the present invention do not use alloying element, greatly improves the comprehensive mechanical property of two-phase, and has reduced cost.Simultaneously few C content, the Ti content a small amount of with interpolation, improves its flange flanging forming performance greatly, can using vehicle Abdeckteil.
The present invention compared with prior art, the automobile high-strength cold-rolled biphase steel plate of producing, yield strength is 200MPa～250MPa, tensile strength is 440MPa～500MPa, unit elongation is 26%～32%.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
Embodiment 1:
Chemical composition (mass percent) C:0.03% of steel, Mn:1.6%, Si:0.21%, Cr:0.28%, Ti:0.0035%, Als:0.02%, surplus is iron and inevitable impurity.
Its preparation technology is:
(1) smelt and solidify: being applicable to converter, electric furnace and induction furnace and smelting, adopt continuous casting to produce strand or die casting production ingot casting;
(2) hot continuous rolling of strand or ingot casting: by strand through 1100～1250 DEG C of heating, carry out the rolling of 5-20 passage by roughing mill, hot rolling to 30-50mm thickness specification, is carried out the rolling of 5-7 passage by hot continuous rolling unit, coils into coil of strip after being rolled to target thickness within the scope of 500-700 DEG C;
(3) pickling and cold-rolling: hot rolled strip, through hydrochloric acid trough pickling, is removed after scale on surface, carried out cold continuous rolling or cold rolling, cold rolling draft is 50～75%, is rolled to target thickness.
(4) continuous annealing:
Sample after acid is rolled, adopt Multipas continuous annealing simulator simulation continuous annealing process, first slowly be heated to after 170 DEG C, be rapidly heated to 800 DEG C, insulation 120s, be chilled to after 680 DEG C and be quickly cooled at 320 DEG C with the speed of cooling of 50 DEG C/s with the speed of 6.5 DEG C/s, overaging is chilled to room temperature after processing 480s.The cold-rolled biphase steel panel products yield strength obtaining is 220MPa, tensile strength 455MPa, and unit elongation 32%, n value is 0.22.
Embodiment 2:
Chemical composition (mass percent) C:0.045% of steel, Mn:1.5%, Si:0.26%, Cr:0.20%, Ti:0.01%, Als:0.04% surplus is iron and inevitable impurity.
Its preparation method is except annealing process, and all the other are identical with embodiment 1.
Sample after acid is rolled, adopt Multipas continuous annealing simulator simulation continuous annealing process, first slowly be heated to after 170 DEG C, be rapidly heated to 780 DEG C, insulation 100s, be chilled to after 660 DEG C and be quickly cooled at 290 DEG C with the speed of cooling of 60 DEG C/s with the speed of 5 DEG C/s, overaging is chilled to room temperature after processing 360s.The cold-rolled biphase steel panel products yield strength obtaining is 230MPa, tensile strength 465MPa, and unit elongation 30%, n value is 0.22.
Embodiment 3: chemical composition (mass percent) C:0.055% of steel, Mn:1.45%, Si:0.28%, Cr:0.25%, Ti:0.015%, Als:0.04% surplus is iron and inevitable impurity.
Its preparation method is except annealing process, and all the other are identical with embodiment 1.
Slowly be heated to after 170 DEG C, be rapidly heated to 760 DEG C, insulation 90s, is chilled to after 650 DEG C and is quickly cooled at 290 DEG C with the speed of cooling of 45 DEG C/s with the speed of 5.5 DEG C/s, and overaging is chilled to room temperature after processing 360s.The cold-rolled biphase steel panel products yield strength obtaining is 235MPa, tensile strength 485MPa, and unit elongation 29%, n value is 0.21.
Embodiment 4: chemical composition (mass percent) C:0.06% of steel, Mn:1.40%, Si:0.28%, Cr:0.10%, Ti:0.018%, Als:0.06% surplus is iron and inevitable impurity.
Its preparation method is except annealing process, and all the other are identical with embodiment 1.
Sample after acid is rolled, adopt Multipas continuous annealing simulator simulation continuous annealing process, first slowly be heated to after 170 DEG C, be rapidly heated to 760 DEG C, insulation 90s, be chilled to after 650 DEG C and be quickly cooled at 290 DEG C with the speed of cooling of 45 DEG C/s with the speed of 7.0 DEG C/s, overaging is chilled to room temperature after processing 360s.The cold-rolled biphase steel panel products yield strength obtaining is 245MPa, tensile strength 495MPa, and unit elongation 26%, n value is 0.21.
Claims (4)
1. the preparation method of the automobile cold-rolled dual phase sheet steel of tensile strength 450MPa level, its chemical composition 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 is Fe and inevitable impurity, the preparation method of the automobile cold-rolled dual phase sheet steel of tensile strength 450MPa level, comprises the following steps successively:
(1) smelt and solidify: being applicable to converter, electric furnace and induction furnace and smelting, adopt continuous casting to produce strand or die casting production ingot casting;
(2) hot continuous rolling of strand or ingot casting: by strand through 1100-1250 DEG C of heating, carry out the rolling of 5-20 passage by roughing mill, hot rolling to 30-50mm thickness specification, is carried out the rolling of 5-7 passage by hot continuous rolling unit, coils into coil of strip after being rolled to target thickness within the scope of 500-700 DEG C;
(3) pickling and cold-rolling: hot rolled strip, through hydrochloric acid trough pickling, is removed after scale on surface, carried out cold rollingly, cold rolling draft is 50～75%, is rolled to target thickness;
(4) continuous annealing: by the good steel plate of pickling and cold-rolling step process, first slowly be heated to after 170 DEG C, be rapidly heated to 760-800 DEG C, insulation 90-120s, be chilled to after 650-680 DEG C and be cooled at 290-320 DEG C with the speed of cooling of 45-60 DEG C/s with the speed of 5-7 DEG C/s, overaging is chilled to room temperature after processing 300-500s.
2. the preparation method of the automobile cold-rolled dual phase sheet steel of tensile strength 450MPa level according to claim 1, is characterized in that:
Described slow heating, heats with the speed of 5-15 DEG C/s;
Described being rapidly heated refers to process furnace peak power and heats up.
3. the preparation method of the automobile cold-rolled dual phase sheet steel of tensile strength 450MPa level, its chemical composition 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 is Fe and inevitable impurity, the preparation method of the automobile cold-rolled dual phase sheet steel of tensile strength 450MPa level, comprises the following steps successively:
(1) smelt and solidify: being applicable to converter, electric furnace and induction furnace and smelting, adopt continuous casting to produce strand or die casting production ingot casting;
(2) hot continuous rolling of strand or ingot casting: by strand through 1100-1250 DEG C of heating, carry out the rolling of 5-20 passage by roughing mill, hot rolling to 30-50mm thickness specification, is carried out the rolling of 5-7 passage by hot continuous rolling unit, coils into coil of strip after being rolled to target thickness within the scope of 500-700 DEG C;
(3) pickling and cold-rolling: hot rolled strip, through hydrochloric acid trough pickling, is removed after scale on surface, carried out cold rollingly, cold rolling draft is 50～75%, is rolled to target thickness;
(4) continuous annealing: by the good steel plate of pickling and cold-rolling step process, be rapidly heated to 760-800 DEG C, insulation 90-120s, is chilled to after 650-680 DEG C and is cooled at 290-320 DEG C with the speed of cooling of 45-60 DEG C/s with the speed of 5-7 DEG C/s, and overaging is chilled to room temperature after processing 300-500s.
4. the preparation method of the automobile cold-rolled dual phase sheet steel of tensile strength 450MPa level according to claim 3, is characterized in that:
Described being rapidly heated refers to process furnace peak power and heats up.
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| CN103131843B (en) * | 2013-01-02 | 2014-05-28 | 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 |
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| CN107267726A (en) * | 2017-06-06 | 2017-10-20 | 武汉钢铁有限公司 | The manufacture method of 450MPa grades of cold-rolled biphase steels of tensile strength |
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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 |
| 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 |
| 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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Address after: 243003 Department of intellectual property right of Hunan West Road No. 8 technology center, Ma'anshan City, Anhui Province Co-patentee after: Ma'anshan Iron and Steel Co., Ltd. Patentee after: Magang (Group) Holding Company Ltd. Address before: 243003 Anhui city of Ma'anshan province Jiuhua Mountain Rain Road No. 8 Co-patentee before: Ma'anshan Iron and Steel Co., Ltd. Patentee before: Magang (Group) Holding Company Ltd. |