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Steel sheet excellent in bake hardenability and corrosion resistance and method for producing the same

一种烘烤硬化、耐蚀性的技术，应用在制造工具、炉、热处理设备等方向，能够解决制造成本增加、难以确保镀覆质量等问题

Active Publication Date: 2022-03-08
POSCO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this technology, it is difficult to ensure excellent plating quality due to the addition of a large amount of Si, and there is a problem that the manufacturing cost increases due to the addition of a large amount of Ti and Mo.

Method used

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  • Steel sheet excellent in bake hardenability and corrosion resistance and method for producing the same
  • Steel sheet excellent in bake hardenability and corrosion resistance and method for producing the same
  • Steel sheet excellent in bake hardenability and corrosion resistance and method for producing the same

Examples

Experimental program
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Effect test

Embodiment Construction

[0150] A billet having an alloy composition described in Table 1 below was prepared, and then a hot-dip galvanized steel sheet (GI steel sheet) or an alloyed hot-dip galvanized steel sheet (GA steel sheet) was manufactured using the manufacturing process described in Table 2 and Table 3 below. At this time, the hot-dip galvanizing is performed using a conventional hot-dip galvanizing bath, and the alloying heat treatment is also performed under normal conditions (500-540° C.).

[0151] For reference, in Table 1 below, Invention Steels 1, 2, 4, and 5 and Comparative Steels 1 and 2 correspond to alloyed hot-dip galvanized steel sheets, and Invention Steels 3, 6, and 7 correspond to hot-dip galvanized steel sheets. Comparative steel 1 is BH steel using conventional ultra-low carbon steel, and Comparative steel 2 is high carbon DP steel series steel.

[0152] The microstructures of the respective plated steel sheets manufactured as described above were observed and their physical ...

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PUM

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Abstract

The present invention relates to a steel sheet used as a material for automobile outer panels, etc., and a manufacturing method thereof, and more particularly, to a cold-rolled steel sheet having excellent bake hardenability, corrosion resistance, and aging resistance, and a hot-dipped steel sheet Zinc-based steel sheet and its manufacturing method.

Description

technical field [0001] The present invention relates to a steel sheet used as a material for automobile outer panels, etc., and a manufacturing method thereof, and more particularly, to a cold-rolled steel sheet having excellent bake hardenability, corrosion resistance, and aging resistance, and a hot-dipped steel sheet Zinc-based steel sheet and its manufacturing method. Background technique [0002] With the regulation of strengthening the collision stability of automobiles and fuel efficiency, high-strength steel is being actively used to meet both the weight reduction and high-strength of the car body, and according to this trend, the application of high-strength steel to the outer panels of automobiles is also expanding. [0003] At present, most of them use 340MPa-class bake-hardened steel as the outer panels of automobiles, but some use 490MPa-class steel plates, and it is expected to expand to 590MPa-class steel plates in the future. [0004] As described above, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C21D9/46C22C38/60C22C38/04C21D8/02C23C2/40C23C2/06C23C2/28
CPCC21D8/02C21D9/46C22C38/04C22C38/18C22C38/60C23C2/06C23C2/28C23C2/40C22C38/00C22C38/004C22C38/06C22C38/02C22C38/001C22C38/32C22C38/22C22C38/54C21D8/0205C21D8/0226C21D8/0236C21D6/002C23C2/02C23C2/0224C23C2/29C21D8/0263C22C38/44C21D8/0273C23C2/024
Inventor 韩箱浩李济雄
Owner POSCO CO LTD
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