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High strength galvanized steel sheet and production method therefor

A technology of galvanized steel sheet and manufacturing method, which is applied in the direction of manufacturing tools, chemical instruments and methods, hot-dip coating process, etc., can solve problems such as delayed fracture, and achieve improved resistance to delayed fracture, high performance of automobile body, high The effect of strengthening

Active Publication Date: 2019-09-20
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in plated steel sheets used in automobiles such as thin sheets, the hydrogen intruded during the steel sheet manufacturing process is difficult to be released by plating, and there is a risk of delayed fracture.

Method used

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  • High strength galvanized steel sheet and production method therefor
  • High strength galvanized steel sheet and production method therefor
  • High strength galvanized steel sheet and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0110] Manufacture of steel plates for evaluation

[0111] Steel having the composition shown in Table 1 and the remainder consisting of Fe and unavoidable impurities was melted in a vacuum melting furnace, and then billet-rolled to obtain a billet-rolled material with a thickness of 27 mm. The obtained slab-rolled material was hot-rolled to a plate thickness of 4.0 to 2.8 mm. Hot rolling was carried out under the conditions shown in Table 2 by setting the slab heating temperature to a temperature of 1000°C to 1250°C. Next, for the sample subjected to cold rolling, the hot-rolled steel sheet was ground to a thickness of 3.2 mm, and then cold-rolled to a thickness of 2.5 to 1.4 mm to manufacture a cold-rolled steel sheet. Next, the hot-rolled steel sheets or cold-rolled steel sheets obtained above were heat-treated under the conditions shown in Table 2 to manufacture galvanized steel sheets.

[0112] The alloyed hot-dip galvanized steel sheet is manufactured at an alloying te...

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Abstract

Provided are: a high strength galvanized steel sheet with excellent delayed fracture resistance characteristics resulting from reduction of the amount of diffusible hydrogen in the steel; and a production method therefor. The high strength galvanized steel sheet is provided with: a steel sheet having a specified component composition and a steel structure in which, in area ratio, the total amount of martensite and tempered martensite is at least 30%; and a galvanizing layer formed on the surface of the steel sheet. The amount of diffusible hydrogen obtained from an analysis method is 0.50 wt. ppm or less and the half width of the released hydrogen peak is 70DEG C or less.

Description

technical field [0001] The present invention relates to a high-strength galvanized steel sheet used for automobile parts and the like and a method for producing the same. More specifically, the present invention relates to a high-strength galvanized steel sheet excellent in delayed fracture resistance and a method for producing the same. Background technique [0002] In recent years, improving the fuel efficiency of automobiles has become an important issue from the viewpoint of protecting the global environment. Along with this, studies are being made to reduce the weight of the vehicle body itself by increasing the strength of the steel plate used for the vehicle body. [0003] With increasing strength of steel sheets, delayed fracture (hydrogen embrittlement) may occur. So far, technologies to improve delayed fracture resistance have been applied only to products such as bolts, bars, and thick plates. However, in plated steel sheets used for automobiles such as thin sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/06C22C38/60
CPCC21D9/46C22C38/06C22C38/02C22C38/04C22C38/001C22C38/12C22C38/14C22C38/18C22C38/22C22C38/20C22C38/42C22C38/44C22C38/54C22C38/002C22C38/005C22C38/008C21D8/0205C21D8/0226C21D8/0236C21D8/0247C23C2/06C25D5/50C21D2211/008C21D2211/005C21D2211/009C21D2211/002C25D7/0614C23C2/28C23C2/04C23C2/40C25D3/562C25D3/565C23C2/29C22C38/60C23C28/025B32B15/012B32B15/013C21D6/004C21D6/005C21D6/008C21D8/0263C22C38/48C22C38/50C22C38/58C21D6/002C22C38/32C21D8/02C22C38/08B32B15/18C22C38/24C23C28/021Y10T428/12951Y10T428/12799C23C30/00C22C38/26C22C38/40C21D8/0278Y10T428/12958C22C38/16C22C38/38C22C38/46Y10T428/12972C22C38/28C23C30/005B32B15/043C23C28/023B32B15/04Y10T428/12757
Inventor 平岛拓弥中垣内达也木庭正贵江桥辰哉今村真人
Owner JFE STEEL CORP
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