Manufacturing method of 500MPa-grade zinc-iron alloy coating dual-phase steel plate for automobile outer panel

A technology of zinc-iron alloy and manufacturing method, which is applied in the field of manufacturing zinc-iron alloy-coated dual-phase steel sheets for 500MPa-level automotive outer panels, can solve the problems of low surface quality requirements and insufficient attention to surface quality, and achieve color without defects , Excellent anti-powdering performance, uniform color effect

Inactive Publication Date: 2017-10-20
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

[0002] At present, cold-rolled dual-phase steel and hot-dip galvanized dual-phase steel are mainly used in automotive structural parts and reinforcements, which do not require high surface quality.

Method used

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  • Manufacturing method of 500MPa-grade zinc-iron alloy coating dual-phase steel plate for automobile outer panel
  • Manufacturing method of 500MPa-grade zinc-iron alloy coating dual-phase steel plate for automobile outer panel
  • Manufacturing method of 500MPa-grade zinc-iron alloy coating dual-phase steel plate for automobile outer panel

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0017] Embodiment: A manufacturing method of a 500MPa grade zinc-iron alloy coated dual-phase steel sheet for automobile outer panels, including the following steps:

[0018] 1) After the steel is smelted, refined and continuously cast into billets, the cast billets are heated, and the heating temperature is controlled at 1250~1280℃;

[0019] 2) Carry out rough rolling and control the rough rolling temperature at 1060~1110℃;

[0020] 3) Perform finishing rolling and control the finishing temperature of finishing rolling to 900~930℃;

[0021] 4) For coiling, control the coiling temperature at 580~620℃;

[0022] 5) Carry out pickling, the pickling temperature is controlled at 80~90℃, and the acid concentration is greater than 70g / l;

[0023] 6) Carry out cold rolling, and control the total reduction rate of cold rolling at 58-72%;

[0024] 7) Continuous annealing: control the soaking temperature at 770-800℃, the dew point of the annealing atmosphere in the furnace is controlled below -40℃, ...

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Abstract

The invention discloses a method for manufacturing a 500MPa-grade zinc-iron alloy coated dual-phase steel sheet for automobile outer panels, which is characterized in that it comprises the following steps: 1) after the steel is smelted, refined and continuously cast into billets, the cast billet is heated ; 2) rough rolling; 3) finish rolling; 4) coiling; 5) pickling; 6) cold rolling; 7) continuous annealing; 8) hot-dip galvanizing; 9) alloying; 10) Carry out lightening. The invention has the beneficial effects of excellent mechanical properties, good surface quality and excellent pulverization resistance.

Description

technical field [0001] The invention relates to a method for manufacturing cold-rolled dual-phase steel, in particular to a method for manufacturing a zinc-iron alloy-coated dual-phase steel sheet for 500MPa-level automobile outer panels. Background technique [0002] At present, cold-rolled dual-phase steel and hot-dip galvanized dual-phase steel are mainly used in automotive structural parts and reinforcements, which do not require high surface quality. Therefore, more attention is paid to the mechanical properties of the product in terms of composition design and process control , and insufficient attention has been paid to its surface quality. The dual-phase steel with zinc-iron alloy coating has been used in the manufacture of Japanese car exterior panels, so higher requirements are put forward for its surface quality under the condition of ensuring mechanical properties. Contents of the invention [0003] The object of the present invention is to solve the shortcomi...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/22C22C38/02C22C38/06C22C38/04
CPCC21D8/0226C21D8/0236C21D8/0247C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/22
Inventor 杜小峰林承江胡宽辉苏衍战陈园林陈宇孙方义方芳
Owner 武汉钢铁有限公司
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