Title:
耐水素遅れ破壊特性、耐剥離性、及び溶接性に優れた熱間成形用アルミニウム−鉄合金めっき鋼板、並びにそれを用いた熱間成形部材
Document Type and Number:
Japanese Patent JP6704995
Kind Code:
B2
Abstract:
Provided are an aluminum-iron alloy-coated steel sheet for hot press forming, having excellent hydrogen delayed fracture resistance, peeling resistance and weldability, and a hot-formed member using the same. The present invention relates to an alloyed aluminum-coated steel sheet for hot press forming, comprising a base steel sheet, an oxide layer, and an alloyed coat layer formed therebetween, characterized in that the base steel sheet comprises, by weight, 0.1-0.5% of C, 0.01-2% of Si, 0.01-10% of Mn, 0.001-0.05% of P, 0.0001-0.02% of S, 0.001-1.0% of Al, 0.001-0.02% of N, a balance amount of Fe and other inevitable impurities, the alloyed coat layer comprises: an Al-Fe alloyed layer(I) formed on the base steel sheet and having a Vicker's hardness of 200-800Hv; an Al-Fe alloyed layer (III) formed on the Al-Fe alloyed layer (I) and having a Vicker's hardness of 700-1200Hv; and an Al-Fe alloyed layer (II) continuously or discontinuously formed in a lengthwise direction of the steel sheet within the Al-Fe alloyed layer (III) and having a Vicker's hardness of 400-900 Hv, and the oxide layer contains oxygen in an average amount of 20 % by weight or less at a point 0.1 µ m deep from a surface layer thereof.
Inventors:
Oh, Jin-Gun
Cho, Yoru-Le
Song, Il-Lyon
Kim, Young-su
Cho, Yoru-Le
Song, Il-Lyon
Kim, Young-su
Application Number:
JP2018532440A
Publication Date:
June 03, 2020
Filing Date:
December 23, 2016
Export Citation:
Assignee:
POSCO
International Classes:
C22C38/00; C21D1/18; C21D9/00; C21D9/46; C22C21/00; C22C38/06; C22C38/58; C23C2/12; C23C2/28
Foreign References:
| KR1020150075329A |
Attorney, Agent or Firm:
Hidekazu Miyoshi
Masakazu Ito
Yuko Hara
Masakazu Ito
Yuko Hara