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A kind of galvanized dual-phase steel for 450mpa class car and production method

A dual-phase steel and car technology, applied in the hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems that are not suitable for the production of high-surface-quality galvanized dual-phase steel, and achieve color without defects, which can be Good plating performance and uniform color effect

Active Publication Date: 2017-11-17
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After searching, the Chinese patent application number is 201220277421.X, which discloses "a cold-rolled dual-phase steel plate with a tensile strength of 450MPa and its manufacturing method", which is produced by the C-Si-Mn-Cr composition system. A 450MPa grade cold-rolled dual-phase steel was developed. Since Si is easily enriched on the surface during annealing, it is not suitable for the production of galvanized dual-phase steel with high surface quality.

Method used

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  • A kind of galvanized dual-phase steel for 450mpa class car and production method
  • A kind of galvanized dual-phase steel for 450mpa class car and production method
  • A kind of galvanized dual-phase steel for 450mpa class car and production method

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Embodiment Construction

[0038] The present invention is described in detail below:

[0039] Table 1 is the component value list of each embodiment of the present invention and comparative example;

[0040] Table 2 is the value list of the main process parameters of each embodiment of the present invention and comparative examples;

[0041] Table 3 is a list of performance testing conditions of each embodiment of the present invention and comparative examples.

[0042] Each embodiment of the present invention is produced according to the following steps:

[0043] 1) After the slab is smelted, refined and continuously cast according to the set composition, the slab is heated, and the heating temperature is controlled at 1190~1250°C;

[0044] 2) Carry out finish rolling, and control the final rolling temperature at 890-920°C;

[0045] 3) Coiling: the coiling temperature is controlled at 580-620°C;

[0046] 4) Cold rolling after pickling: the pickling temperature is controlled at 70-90°C, the acid va...

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PUM

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Abstract

450 MPa-level zinc-plated dual-phase steel for a sedan comprises components in percentage by weight as follows: 0.04%-0.09% of C, smaller than or equal to 0.01% of Si, 1.0%-2.0% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.010% of S, 0.01%-0.08% of Als, 0.01%-0.30% of Mo, 0.01%-1.0% of Cr, 0.001%-0.03% of Nb and smaller than or equal to 0.005% of N. The production steps comprise heating of a casting blank after smelting, refining and continuous casting; finish rolling; reeling; cold rolling after acid pickling; hot galvanizing; finishing. The mechanical properties of a product are shown as follows: the yield strength is 260-320 MPa, the tensile strength is 470-510 MPa, the elongation percentage is 28%-33%, and the n value is 0.17-0.19; the product has good platability, the surface of a plating has uniform glossiness and doesn't have defects, an inhibition layer is continuous and compact, the adhesion of the zinc-plated layer reaches the first level of ball impacting, the bending test proves that the zinc-plated layer and base steel are qualified, and surface quality requirements of an intermediate car for a high-strength structural part and an outer covering part can be met.

Description

technical field [0001] The invention relates to a galvanized steel for automobiles and a method thereof, in particular to a galvanized dual-phase steel for 450MPa class cars and a production method thereof. Background technique [0002] With the continuous development of automobile lightweight and the continuous improvement of occupant safety requirements, the proportion and amount of high-strength steel in automobile body-in-white have increased rapidly in recent years. Due to its high strength, low yield ratio and good forming It is more and more favored by the automobile industry, and the proportion of applications in automobiles is constantly increasing. Compared with cold-rolled dual-phase steel, galvanized dual-phase steel also has excellent anti-corrosion performance, which can ensure that automobiles have good corrosion resistance and perforation ability. Zinc duplex steel can also be used in car panels. Under the premise of ensuring the mechanical properties of hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/12C22C38/18C22C38/02C21D8/02C23C2/06C23C2/40
CPCC21D8/0273C21D2211/005C21D2211/008C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18C23C2/06C23C2/40
Inventor 林承江邓照军杜小峰陈园林邱丹胡建旺王立辉潘利波丁涛
Owner 武汉钢铁有限公司
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