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High-strength hot-dip zinc-coated steel sheet and method for manufacturing same

A hot-dip galvanized steel sheet, hot-dip galvanized technology, applied in hot-dip galvanizing process, manufacturing tools, chemical instruments and methods, etc., can solve the problems of high strength resistance, delayed fracture, etc., and achieve excellent delayed fracture resistance. Effect

Active Publication Date: 2021-08-06
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for parts exposed to a corrosive environment, high strength may cause delayed fracture due to intrusion of hydrogen from the environment, which will greatly hinder high strength in plated steel sheets

Method used

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  • High-strength hot-dip zinc-coated steel sheet and method for manufacturing same
  • High-strength hot-dip zinc-coated steel sheet and method for manufacturing same
  • High-strength hot-dip zinc-coated steel sheet and method for manufacturing same

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Embodiment

[0094] Hereinafter, the present invention will be specifically described based on examples. The steel (the remainder is Fe and unavoidable impurities) is melted and rolled in a vacuum melting furnace in the laboratory to make a steel billet. The component composition of the steel is shown in Table 1.

[0095] [Table 1]

[0096]

[0097] These billet materials were heated to 1250° C., rough rolling and hot rolling were performed, and heat treatment of hot-rolled sheets was performed. Next, it was cold-rolled to 1.4 mm to produce a cold-rolled sheet. The obtained cold-rolled sheet was subjected to annealing. In the annealing, a heat treatment and coating treatment apparatus was used in a laboratory to produce galvanized steel sheets (GI) and galvanized steel sheets (GA) 1 to 31. The hot-dip galvanized steel sheet is dipped in a coating bath at 465°C, and the adhesion amount of each single side is 40-60g / m on both sides of the steel sheet. 2 Made of plating layer. The al...

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Abstract

Provided are: a high-strength hot-dip zinc-coated steel sheet having high strength and excellent delayed fracture resistance properties; and a method for manufacturing the high-strength hot-dip zinc-coated steel sheet. A high-strength hot-dip zinc-coated steel sheet having a specified component composition and also having such a steel structure that the total content of martensite and bainite containing a carbide is 60 to 100% by area in a region extending to the depth of 300 to 400 [mu]m from the surface layer of the steel sheet as observed in the sheet thickness direction, the average grain diameter of prior austenite is 15 [mu]m or less, and the ratio of the height of a peak of an Auger electron spectrum of P at a position 5 nm or more away from a prior austenite grain boundary to that at the prior austenite grain boundary in the region extending to the depth of 300 to 400 [mu]m from the surface layer of the steel sheet as observed in the sheet thickness direction is 0.20 or more, wherein a hot-dip zinc coating layer is arranged on the surface of the steel sheet.

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet suitable for automobile components and a manufacturing method thereof. Background technique [0002] From the standpoint of automobile crash safety and improvement of fuel economy, higher strength is required for steel sheets that can be used for automobile parts. Such parts are exposed to corrosive environments and, therefore, there is an increasing demand for high rust resistance. However, increasing the strength of parts exposed to corrosive environments may cause delayed fracture due to intrusion of hydrogen from the environment, and this greatly hinders the increase in strength in plated steel sheets. In particular, most solid parts have sheared end faces, and delayed fracture is likely to start from the sheared end faces. Therefore, development of techniques for improving delayed fracture characteristics is underway. [0003] For example, Patent Document 1 and Pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/60C21D8/02C21D9/46
CPCC22C38/14C22C38/60C21D1/19C21D9/48C21D1/26C21D8/0436C21D8/0447C21D8/0452C21D6/005C21D2211/002C21D8/0478C21D8/0463C21D8/0426C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/12C22C38/42C22C38/58C22C38/002C22C38/005C22C38/08C22C38/16C22C38/18B32B15/013C23C2/06C22C38/28C22C38/22C22C38/32C22C38/38C22C38/008C23C2/28C23C2/29C21D8/0226C21D8/0273C21D8/0236C21D9/46C23G1/02C21D6/008C21D8/0205C21D8/0263C21D2211/001C21D2211/004C23C2/40
Inventor 长谷川宽中垣内达也竹田裕纪
Owner JFE STEEL CORP
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