Production method for Si-contained cold-rolling hot galvanizing dual-phase steel with tensile strength reaching 800MPa level

A technology of tensile strength and production method, which is applied in the production field of cold-rolled hot-dip galvanized dual-phase steel, can solve the problems of low yield ratio, good formability, increased cost, high strength of cold-rolled dual-phase steel, etc., to achieve The equipment is simple, the cost is economical, and the product application performance is good.

Active Publication Date: 2017-02-15
马钢(合肥)钢铁有限责任公司
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  • Application Information

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Problems solved by technology

[0012] That is to say, there are the following problems in the prior art: galvanized dual-phase steel not only has high strength, low yield ratio and good formability of cold-rolled dual-phase steel, but also has good anti-corrosion performance. Phase steel has been

Method used

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  • Production method for Si-contained cold-rolling hot galvanizing dual-phase steel with tensile strength reaching 800MPa level
  • Production method for Si-contained cold-rolling hot galvanizing dual-phase steel with tensile strength reaching 800MPa level
  • Production method for Si-contained cold-rolling hot galvanizing dual-phase steel with tensile strength reaching 800MPa level

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Embodiment Construction

[0038] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

[0039]In a preferred embodiment, an 800MPa grade economical hot-dip galvanized dual-phase steel sheet containing Si has the following chemical composition mass percentages: C: 0.08-0.12%; Si: 0.10-0.18%; Mn: 1.5-2.5% %; Cr: 0.2~0.4%; Mo: 0.12~0.20%; Als: 0.03-0.06%, P≤0.015%, S≤0.04%, N:≤0.005%, and the balance is Fe and unavoidable impurities.

[0040] The preparation method of the present invention comprises the following steps in turn:

[0041] (1) Smelting and solidification: suitable for smelting in converters, electric furnaces and induction furnaces; continuous casting is used to produce slabs, and dynamic light reduction and electromagnetic stirring systems can be used to ensure the quality of slabs;

[0042] (2) Continuous hot rolling of cast slab or ingot: heat the cast slab a...

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Abstract

The invention relates to a production method for Si-contained cold-rolling hot galvanizing dual-phase steel with tensile strength reaching 800MPa level. The cold-rolling hot galvanizing dual-phase steel comprises, by mass, 0.08%-0.12% of C, 0.10%-0.18% of Si, 1.5%-2.5% of Mn, 0.2%-0.4% of Cr, 0.12%-0.20% of Mo, 0.03%-0.06% of Als, 0-0.015% of P, 0-0.04% of S, 0-0.005% of N, and the balance Fe and inevitable impurities. Due to the fact that chemical component design is combined with cold rolling, hot rolling, continuous annealing and hot galvanizing technical control, stable production of steel plates can be guaranteed. According to the steel produced through the method, yield strength is 426MPa-540MPa, tensile strength is larger than or equal to 800MPa, and the ductility is larger than or equal to 15%. The production method has the characteristics that cost is low, equipment is simple and product application performance is good.

Description

technical field [0001] The invention relates to the field of manufacturing cold-rolled hot-dip galvanized steel for automobiles, in particular to a production method of cold-rolled hot-dip galvanized dual-phase steel containing Si with a tensile strength of 800 MPa. Background technique [0002] With the development of the automobile industry, saving energy and reducing consumption, increasing safety and reliability, and improving the corrosion resistance of the car body have become common pursuits of users. The use of high-strength galvanized sheets has become an inevitable trend in the development of automotive steel. [0003] Dual-phase steel is currently the most widely used high-strength steel in the automotive industry. Dual-phase steel for automobiles is divided into hot-rolled dual-phase steel, cold-rolled dual-phase steel, and cold-rolled hot-dip galvanized dual-phase steel according to different process paths. Among them, the dual-phase steel with The ferrite / marte...

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Application Information

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IPC IPC(8): C22C38/38C22C38/22C22C38/02C22C38/06C21D8/02C23C2/06C23C2/40
CPCC21D8/0226C21D8/0236C21D8/0273C21D2211/005C21D2211/008C22C38/02C22C38/06C22C38/22C22C38/38C23C2/06C23C2/40
Inventor 马二清崔磊刘永刚詹华陈乐张宇光刘启龙李德超
Owner 马钢(合肥)钢铁有限责任公司
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