CN104498821B - Medium-manganese high-strength steel for automobiles and production method thereof - Google Patents

Medium-manganese high-strength steel for automobiles and production method thereof Download PDF

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CN104498821B
CN104498821B CN201410737988.XA CN201410737988A CN104498821B CN 104498821 B CN104498821 B CN 104498821B CN 201410737988 A CN201410737988 A CN 201410737988A CN 104498821 B CN104498821 B CN 104498821B
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steel
temperature
rolling
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manganese
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CN104498821A (en
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潘利波
林承江
邓照军
朱万军
孙宜强
张志建
魏星
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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 medium-manganese high-strength steel for automobiles and a production method thereof. The steel comprises the following chemical ingredients in percentage by weight: 0.13-0.19 percent of C, 0.15-0.25 percent of Si, 5.5-6.5 percent of Mn, 0-0.09 percent of P, 0.02-0.05 percent of Nb, 0.16-0.25 percent of Mo, 1.2-1.8 percent of Al, 0-0.01 percent of S, 0-0.003 percent of N, and the balance of Fe and inevitable impurities. The method comprises the steps of melting, casting, carrying out solid solution treatment, hot-rolling, cold-rolling and annealing, wherein the solid solution treatment temperature is 1180-1220 DEG C, and the insulating time is 0.8-1.2 hours; in the step of hot rolling, the rolling start temperature is 1050-1100 DEG C, and the rolling final temperature is 850-890 DEG C; in the step of cold rolling, the reduction rate is 60-80 percent; and the annealing temperature is 630-670 DEG C, and the insulating time is 1-2 hours. The steel has high strength and excellent plasticity, can be used for producing automobile parts with complicated shapes due to the strength and ductility product without excessiveness, and can be used for producing steel for automobiles at a relatively low production cost, and has a great application prospect in lightweight automotive designing.

Description

Manganese high-strength steel and its production method in automobile use
Technical field
The present invention relates to metallurgical technology, manganese high-strength steel and its production method in being used in particular to a kind of automobile.
Background technology
With automobile industry development, market is increasingly improved to the demand of small displacement and low energy consumption automobile.And automobile often mitigates 10% weight, fuel consumption can reduce by 3~7%.From cost, the energy, the aspect such as safety and environment considers, automotive light weight technology It is the inexorable trend of Hyundai Motor industry development.Ferrous materials have accounted for 55~70% in vehicle gross weight, therefore, to steel material Material carries out performance optimization and upgrading is the important means for promoting automotive light weight technology process.TRIP steel (transformation induced plasticity steel) and TWIP steel is arisen at the historic moment as high-strength vehicle with steel, has been widely used on automobile.
Traditional TRIP steel is the one kind in the advanced high intensity steel of the first generation, because can be produced in its deformation process austenite to The transformation of martensite, it has high-ductility, high-strain hardening and a high energy absorption capability, but its strength and ductility product it is general 15~ 25GPa%, is not suitable for producing the more complicated parts of shape, and tradition TRIP steel also because alloying element addition is excessive, There are problems that high cost and controlling of production process.TWIP steel belongs to the advanced high-strength steel of the second generation, is obtained by producing twin To plasticity and intensity high, but it equally exists and causes relatively costly problem because alloying element addition is excessive, and TWIP The strength and ductility product of steel is up to more than 40GPa%, this for automotive safety part or structure steel, the strength and ductility product be it is superfluous, It is unfavorable for saving production cost.
Wherein, manganese cold-rolled steel sheet and its preparation side in a kind of high-strength high-plasticity are disclosed in CN201310560593.2 Method, manganese cold-rolled steel sheet main component weight/mass percentage composition is in the high-strength high-plasticity:C:0.15~0.25%, Mn:7~8%, Si:1.2~1.8%, Al:≤ 0.05%, smelted according to composition, and base is cast as, strand obtains heat through multistage hot deformation Roll plate, carry out the cold rolling of intermediate heat-treatment twice and two stages to hot rolled plate, intermediate heat-treatment temperature be more than Ar1 80~ 120 DEG C, soaking time 8h and more than, two benches are cold rolling, and its deflection is 30~50%, and the finished heat treatment of cold-rolled steel sheet is Ar1+70 DEG C and 10min~2h annealed above;CN201310681656.X discloses a kind of more than tensile strength 1000MPa, always Elongation percentage more than 60%, cold rolling middle manganese TRIP steel of strength and ductility product about more than 60GPa% and preparation method thereof, the cold rolling middle manganese TRIP The chemical component weight percentage of steel is respectively containing C0.15~0.20%, Mn8.0~11.0%, A13.0~4.0%, and Nb0~ 0.040%, balance of Fe and impurity, the preparation method of the Cold-Rolled TRIP Steel include smeltings, forging, hot rolling, roll after be heat-treated, it is sour Wash, it is cold rolling and be heat-treated after rolling.Steel grade in above-mentioned two documents, the alloying element content of addition is higher, produces integrated cost Height, fails in the extensive use of automobile production field.
In addition, CN201110343384.3 discloses a kind of 750MPa~880MPa grades of vehicle high-strength steel and its producer Method, its chemical component weight percentage is:C:0.07~0.09%, Si:0.15~0.25%, Mn:1.4~1.9%, Nb: 0.04~0.06%, Mo:0~0.15%, V:0~0.04%, Ti:0.07~0.14%, Al:0.01~0.06%, P:≤ 0.02%, S:≤ 0.01%, N:≤ 0.008%, remaining is Fe and inevitable impurity;Production method is:Smelt, be cast as Base, is heated to 1180~1250 DEG C, and finishing temperature is 820~850 DEG C, and final cooling temperature is 560~600 DEG C, and coil of strip is offline laggard Row slow cooling is processed, and the strength of materials is up to 750MPa~880MPa, while having good low-temperature impact toughness and cold forming capability. The steel grade intensity rank is higher, but plasticity it cannot be guaranteed that, strength and ductility product rank can not meet automobile component production requirement.
The content of the invention
Present invention aim to provide manganese high-strength steel and its production method during a kind of automobile is used, the steel has high intensity With excellent plasticity, production cost is significantly reduced while automobile steel demand is met.
To achieve the above object, the technical solution adopted by the present invention is:Manganese high-strength steel, the chemistry of the steel in a kind of automobile use Composition by weight percent is as follows:C:0.13~0.19%, Si:0.15~0.25%, Mn:5.5~6.5%, P:0~0.09%, Nb:0.02~0.05%, Mo:0.16~0.25%, Al:1.2~1.8%, S:0~0.01%, N:0~0.003%, remaining is Fe and inevitable impurity.
Further, the chemical component weight percentage of the steel is as follows:C:0.167~0.19%, Si:0.166~ 0.25%, Mn:5.5~5.9%, P:0.04~0.08%, Nb:0.021~0.035%, Mo:0.20~0.25%, Al:1.5 ~1.79%, S:0.004~0.009%, N:0.0015~0.0029%, remaining is Fe and inevitable impurity.
A kind of above-mentioned automobile use in manganese high-strength steel production method, including smelting, casting, solution treatment, hot rolling, it is cold rolling and The step of annealing, the temperature of the solution treatment is 1180~1220 DEG C, and soaking time is 0.8~1.2h;The hot rolling, open rolling Temperature is 1050~1100 DEG C, and finishing temperature is 850~890 DEG C;Described cold rolling, reduction ratio is rate 60~80%;The annealing, Annealing temperature is 630~670 DEG C, and soaking time is 1~2h.
Further, the solid solution temperature is 1200~1220 DEG C, and soaking time is 1~1.2h.
Further, the start rolling temperature of the hot rolling is 1080~1100 DEG C, and finishing temperature is 870~890 DEG C.
Further, described cold rolling, reduction ratio is rate 75~80%.
Further, the annealing, annealing temperature is 650~670 DEG C, and soaking time is 1~1.5h.
Explanation is analyzed with regard to chemical composition of the invention and production method below:
(1) chemical composition
C:Carbon can improve the intensity and hardness of TRIP steel by solution strengthening, but its too high can hinder deformation process The phase transformation of middle martensite, therefore, the present invention controls 0.13~0.19% the content of carbon.
Mn:TRIP steel is mainly by phase transformation to obtain high intensity and high-ductility, and TWIP steel by the generation of twin come High-ductility is obtained, the manganese of high content can make steel TWIP effects occur, and suitable manganese content can just obtain TRIP effects, meanwhile, Mn The addition of element can improve the stability of retained austenite, therefore, the design comparison of Mn contents is crucial, manganese in present invention use System, the content of Mn is controlled 5.5~6.5%.
Si:Si is conventional deoxidier, has and melts invigoration effect admittedly, can improve quenching degree and temper resistance, is conducive to improving When the elastic limit of steel and its combination property of improvement, increase steel corrosion resistance under field conditions (factors), but Si contents are higher, reduce The toughness of steel, plasticity and ductility, are easily caused and cold short are unfavorable for welding.Therefore, the present invention by the control of the content of Si 0.15~ 0.25%.
Nb:Nb can significantly improve the austenite recrystallization temperature of steel, expand Unhydrated cement scope, realize it is strict not Recrystallization zone is rolled, and promotes the refinement of ferrite crystal grain, and to play a part of to improve intensity and toughness, Nb is combined generation with C Carbide can hinder growing up for austenite crystal in the operation of rolling, be acted on significant refined crystalline strengthening and precipitation strength, but It is that ferro-niobium belongs to precious alloy, steel product cost will be increased when content increases.Therefore, the present invention exists the content desired value control of Nb 0.02~0.05%.
Mo:Mo elements can make the crystal grain refinement of steel, improve the quenching degree of steel, when Mo contents are more than 0.25%, steel it is crisp Property be significantly increased, cause greatly increasing for cracking during bending probability, connecting shaping requirement, the present invention by the control of Mo contents 0.16~ 0.25%.
Al:Aluminium element is ferrite former, and its addition changes the balance characteristics of carbon iron balance phasor, makes ferrite The temperature changed to austenite is improved, and unidirectional austenitic area reduces, and expands two-phase section, strengthens the stabilization of austenite, but aluminium Constituent content is too high, and cost is consequently increased, therefore, it is 1.2~1.8% that the present invention controls Al content.
P:P is unfavorable to the toughness and plasticity of steel, therefore, present invention control P content≤0.09%.
S:The MnS that S too high levels are produced in steel is mingled with can make the vertically and horizontally performance of steel produce notable difference, and impaired low temperature is tough Property, and the weather resistance of steel can be substantially reduced, therefore, present invention control S content≤0.01%.
(1) production method
Because automobile is mainly used in safety member or structural member with advanced high-strength steel, its complexity will not be too high, in steel grade Design of Chemical Composition on, using low-alloy Cost Design, while product higher-strength and good forming property is ensured, Its strength and ductility product is set to be unlikely to superfluous;And in technological design, using suitable rolling and Technology for Heating Processing, improving its strong modeling It is had TRIP steel characteristics concurrently while product, and possess good surface quality;Steel smelting of the present invention produces skill using clean steel Art, carries out solution treatment before hot rolling, cold rolling using heavy reduction, and controls annealing process, steel is generated Ultra-fine Grained nanoscale Ferrite and austenite structure, obtain intensity and high plasticity higher, finally so as to produce phase transformation in subsequent deformation Ensure that low cost and high without superfluous strength and ductility product effect, meet the performance requirement of automotive safety part and structural member to steel.
Wherein, the solution treatment process before hot rolling can the abundant austenitizing of Shi Gang inner tissues;And influenceed in cold-rolling process Final performance is cold rolling reduction ratio;The performance of annealing process centering manganese TRIP steel has a major impact, in annealing process, middle manganese TRIP steel needs to complete recrystallization, and allows austenite crystal to grow, for follow-up phase transformation provides advantage, so that annealing process Temperature and soaking time also directly determine the final intensity of steel and elongation percentage.Therefore, this steel grade passes through optimization design steel grade Study point, and it is 1180~1220 DEG C to control solid solution temperature in process of production, soaking time is 0.8~1.2h, afterwards Hot rolling is carried out, it is 1050~1100 DEG C to control roughing temperature, and finishing temperature is 850~890 DEG C, after the completion of rolling in oil medium Quick cooling, it is cold rolling using 60~80% heavy reduction rate, and it is 630~670 DEG C to control annealing temperature, soaking time is 1~ 2h。
Compared with prior art, the present invention has advantages below:
First, the present invention is by rationally design steel grades, the manganese system in, and optimized production process, cold rolling use Heavy reduction rate, obtains the heterogeneous structure that finished product is organized as Ultra-fine Grained nano-ferrite and austenite, so as to strength and ductility product is obtained be situated between New TRIP steel between traditional TRIP steel and TWIP steel, it not only has the high-ductility of tradition TRIP steel, high-strain hardening Property and high energy absorption capability, and with high intensity and excellent surface quality;Its strength and ductility product is 30~41GPa%, surrender Intensity may be up to 950MPa, and tensile strength may be up to 1200MPa, and elongation is 30% or so.
Second, the species and addition of present invention control alloying element, significantly reduce production cost;Meanwhile, the present invention The strength and ductility product of steel both ensure that it can be used to produce complex-shaped automobile component, and surplus high is unlikely to again, thus using compared with Low production cost obtains the production steel for meeting Hyundai Motor safety member and structural member, has in lightweight vehicle body design Fabulous application prospect.
Third, steel of the present invention is because of its high energy absorption capability, a large amount of collision energies can be absorbed in collision process, so that Improve the security performance of automobile.
Brief description of the drawings
Fig. 1 is the metallurgical structure figure of the light plate of embodiment 1.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail, is easy to more clearly understand the present invention, But they do not constitute to the present invention and limit.
Embodiment 1
The chemical composition and its percetage by weight of steel are as follows:C:0.167%, Si:0.166%, Mn:5.9%, P: 0.05%, Nb:0.035%, Mo:0.20%, Al:1.5%, S:0.006%, N:0.0017%, remaining is for Fe and unavoidably Impurity.
1) smelt:Carry out converter smelting, the chemical composition that control is tapped after smelting;
2) continuous casting:Tapping is cast into strand;
3) solution treatment:Control solid solution temperature for 1200 DEG C, soaking time is 1h;
4) hot rolling:Hot rolling is carried out after solution treatment, it is 1100 DEG C to control start rolling temperature, and finishing temperature is 870 DEG C, hot rolling After the completion of quickly cooled down in oil medium;
5) it is cold rolling:Carried out using 75% reduction ratio cold rolling;
6) anneal:Continuous annealing soaking zone temperature is 650 DEG C, and soaking time is 1.5h.
Fig. 1 is shown in the metallographic structure of obtained steel, is the heterogeneous structure of Ultra-fine Grained nano-ferrite and austenite, and crystal grain is thin It is close uniform;The performance parameter of steel plate see the table below 1.
Embodiment 2:
The chemical composition and its percetage by weight of steel are as follows:C:0.13%, Si:0.25%, Mn:6.49%, P:0.08%, Nb:0.021%, Mo:0.16%, Al:1.21%, S:0.009%, N:0.0029%, remaining is Fe and inevitable impurity.
1) smelt:Carry out converter smelting, the chemical composition that control is tapped after smelting;
2) continuous casting:Tapping is cast into strand;
3) solution treatment:Control solid solution temperature for 1220 DEG C, soaking time is 1h;
4) hot rolling:Hot rolling is carried out after solution treatment, it is 1050 DEG C to control start rolling temperature, and finishing temperature is 850 DEG C, hot rolling After the completion of quickly cooled down in oil medium;
5) it is cold rolling:Carried out using 60% reduction ratio cold rolling;
6) anneal:Continuous annealing soaking zone temperature is 630 DEG C, and soaking time is 2h.
The performance parameter of obtained steel steel plate see the table below 1.
Embodiment 3:
The chemical composition and its percetage by weight of steel are as follows:C:0.19%, Si:0.151%, Mn:5.5%, P:0.04%, Nb:0.049%, Mo:0.25%, Al:1.79%, S:0.004%, N:0.0015%, remaining is Fe and inevitable impurity.
1) smelt:Carry out converter smelting, the chemical composition that control is tapped after smelting;
2) continuous casting:Tapping is cast into strand;
3) solution treatment:Control solid solution temperature for 1180 DEG C, soaking time is 1h;
4) hot rolling:Hot rolling is carried out after solution treatment, it is 1080 DEG C to control start rolling temperature, and finishing temperature is 890 DEG C, hot rolling After the completion of quickly cooled down in oil medium;
5) it is cold rolling:Carried out using 80% reduction ratio cold rolling;
6) anneal:Continuous annealing soaking zone temperature is 670 DEG C, and soaking time is 1h.
The performance parameter of obtained steel steel plate see the table below 1.
Table 1

Claims (6)

1. manganese high-strength steel during a kind of automobile is used, it is characterised in that:The chemical component weight percentage of the steel is as follows:C:0.167~ 0.19%, Si:0.166~0.25%, Mn:5.5~5.9%, P:0.04~0.08%, Nb:0.021~0.035%, Mo: 0.20~0.25%, Al:1.5~1.79%, S:0.004~0.009%, N:0.0015~0.0029%, remaining is for Fe and not Evitable impurity;The production method of the steel, including the step of smelting, casting, solution treatment, hot rolling, cold rolling and annealing, it is described The temperature of solution treatment is 1180~1220 DEG C, and soaking time is 0.8~1.2h;The hot rolling, start rolling temperature be 1050~ 1100 DEG C, finishing temperature is 850~890 DEG C;Described cold rolling, reduction ratio is rate 60~80%;The annealing, annealing temperature is 630~670 DEG C, soaking time is 1~2h.
2. the production method of manganese high-strength steel during automobile described in a kind of claim 1 is used, including smelting, casting, solution treatment, heat Roll, it is cold rolling and annealing the step of, it is characterised in that:The temperature of the solution treatment is 1180~1220 DEG C, and soaking time is 0.8 ~1.2h;The hot rolling, start rolling temperature is 1050~1100 DEG C, and finishing temperature is 850~890 DEG C;Described cold rolling, reduction ratio is Rate 60~80%;The annealing, annealing temperature is 630~670 DEG C, and soaking time is 1~2h.
3. the production method of manganese high-strength steel during automobile is used according to claim 2, it is characterised in that:The solid solution temperature It it is 1200~1220 DEG C, soaking time is 1~1.2h.
4. the production method of manganese high-strength steel during automobile is used according to Claims 2 or 3, it is characterised in that:The hot rolling is opened It is 1080~1100 DEG C to roll temperature, and finishing temperature is 870~890 DEG C.
5. the production method of manganese high-strength steel during automobile is used according to Claims 2 or 3, it is characterised in that:It is described cold rolling, pressure Rate is rate 75~80%.
6. the production method of manganese high-strength steel during automobile is used according to Claims 2 or 3, it is characterised in that:The annealing, annealing Temperature is 650~670 DEG C, and soaking time is 1~1.5h.
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CN104911475B (en) * 2015-06-25 2017-05-10 东北大学 Preparation method for low-carbon medium-manganese high-toughness super-thick steel plate
JP2018538440A (en) * 2015-11-16 2018-12-27 ベントラー スティール / チューブ ゲーエムベーハー Alloy steel and pipe products with high energy absorption capability
CN105861933B (en) * 2016-05-31 2017-10-17 东北大学 The middle manganese TRIP steel plates and its warm-rolling preparation method of a kind of nanometer/ultra-fine
CN105925896B (en) * 2016-06-29 2017-10-24 东北大学 A kind of high plasticity hot-rolled steel plate of 1000MPa grade high-strengths and its manufacture method
CN107794452A (en) * 2016-08-30 2018-03-13 宝山钢铁股份有限公司 A kind of thin strap continuous casting superelevation strength and ductility product continuously surrenders automobile steel and its manufacture method
WO2018124654A1 (en) * 2016-12-28 2018-07-05 연세대학교 산학협력단 High-strength medium manganese steel for warm stamping and method for manufacturing same
CN109333001B (en) * 2018-09-30 2020-06-19 苏州普热斯勒先进成型技术有限公司 High-strength steel automobile outer covering part assembly and manufacturing method thereof
CN109868345B (en) * 2019-02-27 2020-11-24 河北工程大学 High-strength-ductility cold-rolled medium manganese TRIP steel with multi-morphology multi-scale austenite structure and preparation method thereof

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CN102304664A (en) * 2011-09-13 2012-01-04 北京科技大学 High strength and high plasticity aluminum-containing medium manganese transformation-induced plasticity (TRIP) cold-rolled steel plate and preparation method thereof
CN103060678B (en) * 2012-12-25 2016-04-27 钢铁研究总院 A kind of warm-working nanometer austenite strengthens plasticising steel and preparation method thereof

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