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A kind of galvanized dual-phase steel for 500mpa 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-quality galvanized dual-phase steel, and achieve uniform color and no defects, Good plating effect

Active Publication Date: 2017-12-29
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] After searching, the Chinese patent application number is 201410536158.0, which discloses "500MPa grade cold-rolled dual-phase steel and its production method", and adopts the C-Si-Mn-B composition system to produce a 500MPa grade cold-rolled dual-phase steel. Steel, due to the easy enrichment of Si element 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 500mpa class car and production method
  • A kind of galvanized dual-phase steel for 500mpa class car and production method
  • A kind of galvanized dual-phase steel for 500mpa class car and production method

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Embodiment Construction

[0039] The present invention will be described in detail below:

[0040] Table 1 is a list of component values ​​of each embodiment and comparative example of the present invention;

[0041] Table 2 is a value list of main process parameters of each embodiment and comparative example of the present invention;

[0042] Table 3 is a list of performance detection conditions of various embodiments and comparative examples of the present invention.

[0043] Each embodiment of the present invention is produced according to the following steps:

[0044] 1) After smelting, refining and continuous casting into a slab according to the set composition, the slab is heated, and the heating temperature is 1200~1260℃;

[0045] 2) Perform finishing rolling, and control the final rolling temperature at 880~920℃;

[0046] 3) Coiling: the coiling temperature is controlled at 570~610℃;

[0047] 4) Cold rolling after pickling: the pickling temperature is controlled at 70~90℃, the acid value of the acid pool is...

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PUM

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Abstract

A galvanized dual-phase steel for a 500 MPa class car comprises the following components in percentage by weight: 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 or 0.02-0.9% of Cr, 0.001-0.03% of Nb and smaller than or equal to 0.005% of N. The production method comprises the following production steps: heating of casting blanks after smelting, refining and continuous casting, finish rolling, reeling, cold rolling after acid pickling, hot galvanizing, and finishing. According to the mechanical properties of the product, yield strength is 295-365 MPa, tensile strength is 515-558 MPa, ductility is 25-30%, and n value is 0.165-0.18; and platability of the product is good, the surface of a plating layer is uniform in color and does not have defects, an inhibition layer is continuous and compact, the adhesive force of a zinc layer reaches level-one standard of ball punching, bending test on the zinc layer and a steel base is qualified, and requirements of intermediate cars on surface quality of high-strength structures and outer covering parts can be met.

Description

Technical field [0001] The invention relates to a galvanized steel for automobiles and a method, in particular to a galvanized dual-phase steel for 500MPa class cars and a production method. 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. Dual-phase steel has high strength, low yield ratio and good forming. It is more and more favored by the automotive 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 resistance to rust and perforation. Currently, it is mainly used in structural parts and reinforcements of middle and high-end cars, with high surface quality plating. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18C21D8/02C23C2/06C23C2/40
CPCC21D8/0221C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18C23C2/06C23C2/40
Inventor 林承江潘利波王辉刘祥东张道良刘安哲陈迟辉李金周文强刘亮
Owner 武汉钢铁有限公司
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