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Microcrack-reduced, hot press-formed article, and method for manufacturing same

A technology of hot pressing and forming products, applied in the direction of manufacturing tools, heat treatment equipment, hot dip plating process, etc., can solve the problems of fatigue cracks, hinder the durability of parts, etc., and achieve the effect of excellent durability and easy understanding

Active Publication Date: 2018-08-21
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These fine cracks may become the starting point of diffusion cracks in the base steel plate or cause fatigue cracks, which may impede the durability of parts, which is problematic.

Method used

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  • Microcrack-reduced, hot press-formed article, and method for manufacturing same
  • Microcrack-reduced, hot press-formed article, and method for manufacturing same
  • Microcrack-reduced, hot press-formed article, and method for manufacturing same

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Embodiment Construction

[0051] Hereinafter, the present invention will be explained in more detail through examples. However, the description of the following examples is only used to illustrate the implementation of the present invention, and the present invention is not limited to the description of the following examples. This is because the scope of rights of the present invention is determined by the content described in the claims and the content reasonably deduced therefrom.

[0052] As a test piece for plating, a low-carbon cold-rolled steel sheet with a thickness of 0.8 mm, a width of 100 mm, and a length of 200 mm was prepared as a base steel sheet, and then the base steel sheet was immersed in acetone for ultrasonic cleaning to remove the presence on the surface Foreign matter such as rolling oil. Then, after performing a heat treatment in a reducing atmosphere at 750°C to ensure the mechanical properties of the steel sheet at a common hot-dip coating site, it was immersed in a zinc-based pl...

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Abstract

Disclosed are a hot press-formed article and a method for manufacturing the same. The article is manufactured by hot press forming a galvanized steel sheet comprising a base steel plate and a zinc-based coat layer formed on a surface of the base steel plate, wherein the zinc-based coat layer contains at least one element selected from the group consisting of Sb, Sn and Bi in a total amount of 0.05% to 2.0% by weight, and the balanced amount of Zn and inevitable impurities, at least 70% by weight of the at least one element selected from the group consisting of Sb, Sn and Bi being concentratedin a region 3 [mu]m or less distant from the surface of an alloyed zinc-based coat layer, formed by alloying the zinc-based coat layer, of the hot press-formed article.

Description

Technical field [0001] The present invention relates to a hot press molded product that suppresses microcracks and a method of manufacturing the same. Background technique [0002] In recent years, the application of high-strength steel has gradually increased in order to reduce the weight of automobiles. However, when the high-strength steel is processed at room temperature, there is a problem that it is easily worn or broken. In addition, the phenomenon of springback may also occur during processing and it is difficult to perform precise size processing, so it is difficult to form complex products. Therefore, Hot Press Forming (HPF) has been used as the preferred method for processing high-strength steel. [0003] Hot press forming (HPF) is a method that uses the softening and high ductility properties of steel sheets at high temperatures to be processed into complex shapes at high temperatures. More specifically, hot press forming is the process of heating steel sheets to auste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06B21D22/02B21D22/20C23C2/40
CPCB21D22/02B21D22/20C23C2/06C23C2/40C21D1/673C21D8/005C23C2/261C23C2/29B21D22/022
Inventor 黄铉锡孙一领金钟常
Owner 浦项股份有限公司