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780MPa-grade cold-rolled hot-dip galvanized dual-phase steel and preparation method thereof

A technology of hot-dip galvanizing and dual-phase steel, applied in hot-dip galvanizing process, coating, metal material coating process, etc., to achieve the effect of reducing fuel consumption, stable chemical composition, and increasing corrosion resistance

Inactive Publication Date: 2012-05-02
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for the jet hot-dip galvanizing annealing production line that is generally used at present, this problem cannot be solved

Method used

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  • 780MPa-grade cold-rolled hot-dip galvanized dual-phase steel and preparation method thereof
  • 780MPa-grade cold-rolled hot-dip galvanized dual-phase steel and preparation method thereof

Examples

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Embodiment 1

[0048] Example 1, using the production method provided by the present invention to carry out smelting, the weight percentages of the target chemical components at the smelting end point are: C: 0.12%, S: 0.005%, P: 0.008%; the target temperature at the end point of the first furnace during the smelting process It is 1670~1690℃; the target temperature of continuous pouring in the smelting process is 1660~1680℃; Al-Fe is used for deoxidation in the smelting process, and the amount of Al-Fe added is 4kg / t; during the smelting process, adding Slag material, the slag material is added with the steel flow in the early stage of tapping, and 800kg of small-grained lime and 200kg of fluorite are added before the tapping amount of each furnace reaches 1 / 5; after that, Si-Mn is used to adjust Si and micro-carbon Mn-Fe is used to adjust Mn, so that the mass percentage of Mn is 1.9%; the smelting process is in the tapping process, the amount of slag after tapping is ≤80mm, and the tapping t...

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Abstract

The invention provides 780MPa-grade cold-rolled hot-dip galvanized dual-phase steel which comprises the following chemical components by weight percent: 0.10%-0.15% of C, not more than 0.05% of Si, 1.8%-2.0% of Mn, 0.03%-0.04% of Nb, 0.2%-0.35% of Cr, 0.2%-0.25% of Mo, not more than 0.01% of P, not more than 0.01% of S, 0.02%-0.07% of Alt, not more than 0.005% of N and the balance of Fe and impurities. The invention further discloses a preparation method of the cold-rolled dual-phase steel. The dual-phase steel produced according to the chemical components and the preparation method provided by the invention is stable in chemical components and has high strength and excellent elongation rate; and the dual-phase steel can reduce the dead weight of an automobile, reduce oil consumption and further increase the corrosion resistance of the automobile when the dual-phase steel is applied to automobile manufacturing industry.

Description

technical field [0001] The invention relates to the technical field of high-strength cold-rolled hot-dip galvanized steel, in particular to a 780MPa grade cold-rolled hot-dip galvanized dual-phase steel and a preparation method thereof. Background technique [0002] Reducing fuel consumption and improving body safety are the development trends of the automobile industry. Reducing the weight of a car is an effective way to reduce fuel consumption, which requires the use of thinner steel plates. However, the thinning of steel will inevitably lead to the reduction of the safety performance of the automobile body. In order to alleviate this contradiction, the use of high-strength and ultra-high-strength steel plates is the only way to design the body. On the other hand, the corrosion resistance of automobiles has also become an increasing requirement for high-end automobiles. [0003] The dual phase steel (DualPhaseSteel, referred to as DP) microstructure is composed of polygo...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C33/04C21D8/02C23C2/40C23C2/06
Inventor 姜英花邝霜刘广会腾华湘刘光明
Owner SHOUGANG CORPORATION
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