CN102174685B - 800 MPa grade cold-rolling dual-phase steel and manufacturing method thereof - Google Patents

800 MPa grade cold-rolling dual-phase steel and manufacturing method thereof Download PDF

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CN102174685B
CN102174685B CN 201110071272 CN201110071272A CN102174685B CN 102174685 B CN102174685 B CN 102174685B CN 201110071272 CN201110071272 CN 201110071272 CN 201110071272 A CN201110071272 A CN 201110071272A CN 102174685 B CN102174685 B CN 102174685B
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steel
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CN102174685A (en
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林承江
江海涛
王辉
米振莉
叶仲超
唐荻
钟定忠
田志强
胡骏
定巍
邓照军
黎静
吴青松
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Group Corp
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Abstract

The invention discloses 800 MPa grade cold-rolling dual-phase steel and a manufacturing method thereof. The steel contains the following chemical compositions in percentage by weight: 0.10-0.18% of C, 0.03-0.19% of Si, 2.6-3.0% of Mn, 0.01-0.04% of Als, 0.15-0.9% of Cr, and the balance of Fe and other inevitable impurities. The manufacturing method for the steel comprises the following steps sequentially: heating billet steel to 1150-1250 DEG C along with a furnace and preserving the temperature for 1.5-3 hours under heat insulation condition, then performing hot rolling, wherein the rough rolling start rolling temperature is controlled within the range from 1050 DEG C to 1110 DEG C, the precision rolling finish rolling temperature is controlled within the range from 860 DEG C to 900 DEG C, and the simulation curling temperature is controlled within the range from 560 to 600 DEG C; washing a hot rolled plate with acid and then carrying out cold rolling; wherein the cold rolling pressing rate is controlled to be 45-75%, then performing the annealing treatment, wherein the annealing temperature is controlled within the range from 760 DEG C to 860 DEG C; and slowly cooling the hot rolled plate to 630-680 DEG C after keeping for 1-5 minutes under heat preservation condition and then rapidly cooling to be below 350 DEG C at a speed more than 25 DEG C/s for ageing treatment lasting for 5-10 minutes. The practice proves that the steel has the advantages of low yield strength, low yield ratio, high coefficient of elongation, and excellent forming property, and the manufacturing method has simple process and low cost.

Description

800MPa level cold-rolled biphase steel and manufacture method thereof
Technical field
The invention belongs to the high-strength steel production technical field, refer to particularly a kind of 800MPa level cold-rolled biphase steel and manufacture method thereof.
Background technology
Along with the development of Vehicle mass reduction and improving constantly of passenger safety requirement, other ultrahigh-strength steel of 800MPa and higher level more and more is applied in intermediate car structural part and the stiffener, to reach energy-saving and emission-reduction and to improve car load crashworthiness effect.In recent years, international automobile manufacturer is on vehicle newly developed, the ratio of using the super-high strength steel plate has reached about 20%, the vehicle of winning international prize high tensile steel plate usage ratio is generally about 70%, and domestic Europe, the United States, Japanese and independent brand new model high tensile steel plate employing rate also increase year by year.And cold-rolled biphase steel because of it has that yield strength is low, tensile strength is high, work hardening capacity is strong, breaking elongation and uniform elongation greatly, the easy plurality of advantages such as stamping, good plasticity and toughness coupling, the extremely favor of automotive industry circle.
The principal feature of 800MPa level cold-rolled biphase steel on chemical ingredients is low-carbon and low-alloy both at home and abroad at present.Main alloy element is take Si, Mn as main, in order to obtain duplex structure, different according to production technique and service requirements, also add the elements such as an amount of Cr, Mo, V, Nb, having formed with Si-Mn system, Mn-Mo system, Si-Mn-Cr-V system and Mn-Si-Cr-Mo is main dual phase steel series.But the Mo element is expensive, production cost is high, and the adding of the microalloy elements such as Nb, V has increased the difficulty of technology controlling and process in the production process, capacity of equipment and control level are had relatively high expectations, and the fluctuation of technique is larger on the impact of final performance, adds simultaneously the precipitation strength effect that Nb, V produce, when increasing tensile strength, yield strength also significantly increases, and this is disadvantageous to impact briquetting, is unfavorable for suitability for industrialized production.
Summary of the invention
The object of the present invention is to provide a kind of low cost, low yield strength, low yield strength ratio, high-elongation and forming property good 800MPa level cold-rolled biphase steel and manufacture method thereof.
For achieving the above object, the 800MPa level cold-rolled biphase steel that the present invention is designed, its chemical ingredients by weight percentage ratio is counted:
C:0.10~0.18%, Si:0.03~0.19%, Mn:2.6~3.0%, Als:0.01~0.04%, Cr:0.15~0.9%, all the other are Fe and other inevitable impurity.
800MPa level cold-rolled biphase steel of the present invention adopts vacuum induction furnace smelting, and its manufacture method may further comprise the steps successively:
Steel billet is heated to 1150~1250 ℃ with stove, insulation 1.5~3h, rolling on hot rolls subsequently, the roughing start rolling temperature is controlled at 1050~1110 ℃, finish rolling finishing temperature and is controlled at 860~900 ℃, the curling temperature of simulation and is controlled at 560~600 ℃;
Hot-rolled sheet carries out cold rolling after pickling, cold rolling draft is controlled at 45~75%, carries out subsequently anneal, 760~860 ℃, and after being incubated 1~5min Slow cooling to 630~680 ℃, be quickly cooled to the above speed of 25 ℃/s again and carry out overaging below 350 ℃ and process 5~10min.
Further, described annealing temperature is controlled to be 780~830 ℃.
Further, the speed control of described quick cooling is 25~50 ℃/s.
The below describes chemical ingredients and the manufacture method of 800MPa level cold-rolled biphase steel of the present invention.
(1) chemical ingredients
C is a kind of effective and cheap strengthening element, directly affect the critical zone and process martensitic volume fraction and martensite carbon content in the rear dual phase steel, if carbon content is too low, although can obtain duplex structure, but strengthening effect is not obvious, need to increase Mn, the content of the alloying elements such as Cr comes proof strength, thereby cause cost to increase, carbon content too Gao Ze under same critical Heating temperature, have the austenitic formation of more volume fractions, Cr in the austenite island, the alloying element contents such as Mn reduce relatively, and hardening capacity reduces, be unfavorable for forming martensitic stucture, so among the present invention the weight percentage of carbon be controlled in 0.10~0.18% scope.
Si is ferritic solution strengthening element, and it accelerates carbon to austenitic segregation, and the solid solution carbon in the ferrite is had " removing " and " purification " effect, the generation of thick carbide when reduction gap solution strengthening also can suppress to cool off, the ductility of raising dual phase steel.Yet, the Si too high levels makes troubles for the hot rolling surface quality, as when homogenizing is processed, may form some low-melting complex oxides, and Si content height easy surface enrichment in annealing process, affect zinc-plated performance, so the present invention is controlled at Si content 0.03~0.19% scope.
Mn is typical austenite stabilizer element, significantly improves the hardening capacity of steel, and plays the effect of solution strengthening and refinement ferrite crystal grain, can significantly postpone perlitic transformation and bainite transformation.Mn can reduce A3, A1 stagnation point as the element that enlarges the γ phase region, and the too low perlitic transformation that easily causes of Mn content is difficult to form the martensite of q.s in the tissue; If but too high levels is also postponed ferritic separating out when can postpone perlitic transformation, and " velocity window " diminished, Bainite Region moves to right, and makes steel become large to the susceptibility of processing condition, is unfavorable for stable batch production.Therefore, the present invention is controlled at Mn content 2.6~3.0% scope.
Als adds for deoxidation, when Als contains quantity not sufficient 0.010%, can not bring into play its effect; On the other hand, form easily the aluminum oxide agglomerate owing to add the aluminium of volume, so Als content is controlled at 0.01~0.04% scope.
The hardening capacity on the austenite island that Cr forms in the time of can improving intercritical annealing, the dual phase steel that does not contain chromium is compared, contain the chromium dual phase steel and can under lower cooling rate, obtain higher Martensite Volume Fraction, simultaneously, chromium and carbon have stronger avidity, hinder the long-range diffusion of carbon atom, cause the difference of Martensite and the variation of distribution, and can reduce ferritic yield strength, more be conducive to obtain the dual phase steel of low yield strength.If chromium content is too low, then solution strengthening and to improve the effect of hardening capacity not remarkable too highly then can increase smelting cost.The present invention is controlled at 0.15~0.9% scope with chromium content.
Cold-rolled biphase steel of the present invention passes through suitably to increase cheap C at Composition Design, Si, the Mn constituent content is to improve intensity and the hardening capacity of steel, reduce and the loss of strength of generation in order to remedy other precious alloy elements, simultaneously by adding suitable alloying elements cr to promote that carbon spreads to austenite, reduce ferritic yield strength, and guarantee under low cooling rate, to obtain higher Martensite Volume Fraction, to reduce this steel to the susceptibility of technique, be convenient to suitability for industrialized production, simultaneously, steel of the present invention obtains under the prerequisite of duplex structure in assurance, take full advantage of carbon, the strengthening effect of element silicon, manganese, the raising hardening capacity effect of chromium element.Owing to do not add the alloying elements such as Mo, Nb, V, the smelting cost of this steel has obtained effective control.
(2) manufacture method
Every technical parameter principle of design is as follows in the cold rolling two-way steel manufacture method of the present invention:
Adopt the 50kg vacuum induction furnace smelting according to described composition, be forged into little square billet, steel billet is heated to 1150~1250 ℃ comparatively high temps with stove can guarantees the equal solid solution of all alloying elements in the steel, and the long period that is incubated 1.5~3h is conducive to enough diffusions of alloying element, promote the homogenizing of alloying element, finally be conducive to the homogenizing of organizing.
Rolling on hot rolls subsequently, the roughing start rolling temperature is controlled at 1050~1110 ℃, is conducive to guarantee follow-up final rolling temperature requirement, avoid because of temperature after the roughing cross low cause steel billet again melt down heating.The finish rolling finishing temperature is controlled at 860~900 ℃, if finishing temperature is lower than below 860 ℃, proeutectoid ferrite and austenite are all extended along machine direction, finish and change rear ferrite and the alternatively distributed banded structure pattern of perlite of forming, banded structure has heredity, the hot rolling banded structure is serious, austenite preferentially forms at the banded structure grain boundaries during cold rolling rear continuous annealing heating, and grow up to perlite fast, in process of cooling subsequently, form banded martensite, cause the steel plate elongation to descend; Simulate curling temperature and be controlled at 560~600 ℃, but by reducing the homogeneity of curling temperature Effective Raise hot-rolled substrate tissue, make the crystal grain of hot-rolled substrate evenly fine and smooth, thereby improve the hot rolling banded structure, and then reduce cold rolling recrystallization crystal particle dimension so that cold rolled annealed organize more even.
Behind pickling and cold-rolling, carry out cold rolling at cold-rolling mill hot-rolled sheet, cold rolling draft is controlled at 45~75%, deformation energy storage by cold-rolled steel sheet increases, crystal grain is crushed, crushes, and ferrite and the perlite of elongation are interlaced, is conducive to recrystallization softening and the austenitic formation of ferrite crystal grain, if but cold rolling draft is too large, resistance to deformation increases, and has increased the load of milling train, wastes energy.Annealing temperature is controlled at 760~860 ℃, is preferably 780~830 ℃ and through being incubated 1~5min, can control austenitic formation, thereby affect martensitic volume fraction, composition and ferrite composition, final control mechanics performance.
Carry out subsequently the two-phase region anneal, with the steel plate Slow cooling to 630~680 ℃ of intervals below the Ar1 temperature, in order to regulating and controlling austenite and ferritic content, it is ferrite that the part austenitic transformation will be arranged in the Slow cooling process, remaining austenite is conducive to all change martensite in fast cold process subsequently because carbon concentration increases, and hardening capacity also increases under low cooling rate, and martensitic phase intensity is also higher, thereby guarantees that final tensile strength is high, yield strength is low, unit elongation is high.Be quickly cooled to again the Ms temperature below 350C and carry out overaging processing 5~10min, can guarantee that austenite all changes martensite into, and can not produce bainite structure and make strength decreased, overaging processing 5~10min can effectively adjust martensite with ferritic phase structure, dislocation and separate out and equate microstructure, finally improves comprehensive mechanical property.The speed of cooling can not be lower than 25 ℃/s, preferred 25~50 ℃/s fast.
The present invention on the basis that composition of steel rationally is set in conjunction with suitable heat processing technique and annealing process to realize the performance of the finished product, reduce the content of alloying constituent, when reaching performance, reduce as much as possible cost, this rigidity can be stablized simultaneously, technological fluctuation is little to performance impact, is conducive to suitability for industrialized production.Taking full advantage of Si, Cr acts on ferritic " purification ", promoted carbon to austenitic diffusion, effectively reduce ferritic yield strength, improved simultaneously austenitic hardening capacity, guarantee that dual phase steel of the present invention can obtain higher martensite content under lower cooling rate.Facts have proved that dual phase steel of the present invention is owing to have low yield strength, low yield tensile ratio, high unit elongation, forming property is good, can be widely used in the reinforcing structure spare such as B column reinforcement plate increasing the car load crashworthiness, and reach loss of weight, emission reduction effect.
Description of drawings
Fig. 1 is the metallographic microstructure structure iron of 800MPa level cold-rolled biphase steel of the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings 800MPa level cold-rolled biphase steel of the present invention and manufacture method thereof are described in further detail:
Adopt the 50kg vacuum induction furnace to smelt at pilot plant, each embodiment surveys chemical ingredients (surplus is Fe and inevitable impurity) as shown in table 1.With steel billet with stove be heated to 1150~1250 ℃ and be incubated 1.5~3h after rolling on conventional hot rolls, the roughing start rolling temperature is controlled at 1050~1110 ℃, the finish rolling finishing temperature is controlled at 860~900 ℃, curling temperature is controlled at 560~600 ℃, with hot-rolled sheet through cold rolling on conventional cold-rolling mill after the pickling, cold rolling draft is controlled at 45~75%, obtain the thick chill attitude cold-reduced sheet of 1.5mm, the hot dip process simulation test machine of the German IWATANI company through introducing carries out anneal again, sample is quickly cooled to behind slow cooling to 600~700 ℃ and is cooled to room temperature after 250~350 ℃ of overaging of carrying out 5~10min are processed behind 760~860 ℃ of insulation 60s~300s.
Table 1:
Embodiment C Si Mn Als Cr
1 0.10 0.05 3.0 0.04 0.56
2 0.18 0.03 2.86 0.03 0.42
3 0.13 0.19 2.72 0.02 0.35
4 0.16 0.16 3.0 0.03 0.15
5 0.14 0.12 2.70 0.04 0.78
6 0.17 0.07 2.77 0.01 0.45
7 0.15 0.09 2.95 0.02 0.20
8 0.11 0.06 2061 0.04 0.90
9 0.15 0.13 2.62 0.02 0.65
Yield strength Rp0.2 (MPa), tensile strength Rm (MPa), uniform elongation (%), unit elongation A to the cold-rolled biphase steel product of this above-mentioned nine embodiment 80mm(%), the mechanical property such as work hardening exponent n10-15 value detects, and the results are shown in Table 2.
Table 2:
The mechanical property of embodiment of the invention dual phase steel annealing sample: yield strength Rp0.2=339~396MPa, tensile strength Rm=833~872MPa, unit elongation A 80mm=16.5~18.2%, n=0.108~0.134, yield tensile ratio are all in 0.4 extremely low scope, and the Mechanical Fluctuation of each embodiment steel is little, and annealing process susceptibility is not strong, is suitable for suitability for industrialized production.
Adopt opticmicroscope that the microstructure of embodiments of the invention cold-rolled biphase steel is observed discovery, the duplex structure that it is organized as typical ferrite+island martensite body, organizing grain fineness number is 11~12 grades.
Embodiment and accompanying drawing show, cold-rolled biphase steel of the present invention have the initial manufacture cementation index high, avoid the premium propertiess such as strain cracking and piece surface be wrinkling without yield extension, can be applicable in the reinforcing structure spares such as car longitudinal beam reinforcing plate, B column reinforcement plate to increase the car load crashworthiness, and reach loss of weight, reduce discharging energy-conservation effect.Can be widely used in vehicle body collision safety spare and inner structural members, along with the development of automotive light weight technology, this steel has good market outlook.

Claims (3)

1. 800MPa level cold-rolled biphase steel, its chemical ingredients by weight percentage ratio is counted: C:0.18%, Si:0.03%, Mn:2.86%, Als:0.03%, Cr:0.42%, all the other are Fe and other inevitable impurity; Its manufacture method may further comprise the steps successively:
Steel billet is heated to 1150 ~ 1250 ℃ with stove, and insulation 1.5 ~ 3h carries out hot rolling subsequently, and the roughing start rolling temperature is controlled to be 1050 ~ 1110 ℃, and the finish rolling finishing temperature is controlled to be 860 ~ 900 ℃, simulates curling temperature and is controlled to be 560 ~ 600 ℃; Hot-rolled sheet carries out cold rolling after pickling, cold rolling draft is controlled to be 45 ~ 75%, then carry out anneal, annealing temperature is controlled at 760 ~ 860 ℃, and after being incubated 1 ~ 5min Slow cooling to 630 ~ 680 ℃, be quickly cooled to the speed of 25 ~ 50 ℃/s again and carry out overaging below 350 ℃ and process 5 ~ 10min.
2. the manufacture method of the described 800MPa level of claim 1 cold-rolled biphase steel may further comprise the steps successively:
Steel billet is heated to 1150 ~ 1250 ℃ with stove, and insulation 1.5 ~ 3h carries out hot rolling subsequently, and the roughing start rolling temperature is controlled to be 1050 ~ 1110 ℃, and the finish rolling finishing temperature is controlled to be 860 ~ 900 ℃, simulates curling temperature and is controlled to be 560 ~ 600 ℃; Hot-rolled sheet carries out cold rolling after pickling, cold rolling draft is controlled to be 45 ~ 75%, then carry out anneal, annealing temperature is controlled at 760 ~ 860 ℃, and after being incubated 1 ~ 5min Slow cooling to 630 ~ 680 ℃, be quickly cooled to the speed of 25 ~ 50 ℃/s again and carry out overaging below 350 ℃ and process 5 ~ 10min.
3. the manufacture method of described 800MPa level cold-rolled biphase steel according to claim 2, it is characterized in that: described annealing temperature is controlled to be 780 ~ 830 ℃.
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CN102644021B (en) * 2012-04-23 2014-07-23 武汉钢铁(集团)公司 600MPa-level cold rolling dual-phase steel with low process sensitivity and production method
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
CN104328348B (en) * 2014-10-13 2016-09-07 河北钢铁股份有限公司邯郸分公司 800MPa level cold-rolled biphase steel and production method thereof
CN104328349B (en) * 2014-11-14 2016-08-17 武汉钢铁(集团)公司 The carbon system cold-rolled dual phase steel of low sial and production method in a kind of high intensity
CN104630641B (en) * 2014-12-11 2017-02-22 武汉钢铁(集团)公司 800MPa-grade high-strength high-plasticity low-carbon medium-manganese steel and manufacturing method thereof
CN105543674B (en) * 2015-12-18 2018-04-10 东北大学 A kind of manufacture method of the strong dual phase steel of high partial plastic forming performance cold rolling superelevation
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CN108950405B (en) * 2018-08-14 2020-02-18 武汉钢铁有限公司 800 MPa-grade multi-phase steel with good flanging performance and production method thereof
CN109898017A (en) * 2019-03-01 2019-06-18 鞍钢股份有限公司 1000MPa grades of cold-bending properties excellent cold-rolled biphase steel and production method
CN110029269A (en) * 2019-03-29 2019-07-19 本钢板材股份有限公司 A kind of 800MPa grades of low cost tempering dual phase steel and preparation method thereof

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