公开(公告)号：US20210114074A1

公开(公告)日：2021-04-22

申请号：US17044194

申请日：2019-04-09

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro KUBO ,  Soshi FUJITA ,  Yoshiaki NAKAZAWA ,  Hideaki IRIKAWA ,  Masahiro FUDA

IPC: B21D22/02 ,  C21D1/673 ,  B32B15/01

Abstract: A method of producing a hot press-formed product includes subjecting an Al-plated steel sheet having a zinc compound layer or a metallic zinc layer, as an outermost layer, provided on an Al plating layer to hot press forming using a die. The die includes a hard layer having a skewness (Rsk), as measured in a direction from the outside of a die hole toward the inside of the die hole, of 1.3 or less and a hardness Hv_Die of HV 2,000 or more, over the entirety of a region of a steel sheet contact surface that is adjacent to a die shoulder portion. The steel sheet contact surface is a surface located outside of the die hole and configured to contact the Al-plated steel sheet that is to be subjected to the hot press forming.

公开(公告)号：US20200238357A1

公开(公告)日：2020-07-30

申请号：US16651229

申请日：2018-09-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro KUBO ,  Yoshiaki NAKAZAWA ,  Toshiya SUZUKI ,  Naruhiko NOMURA ,  Soshi FUJITA ,  Hideaki IRIKAWA ,  Masahiro FUDA

IPC: B21D22/20 ,  B32B15/04 ,  B21D24/04 ,  C23C2/12 ,  B32B9/04

Abstract: Provided is a coated steel sheet including a steel sheet, a first aluminum coating layer provided on a first surface of the steel sheet, a zinc compound layer or a metallic zinc layer provided on a surface of the first aluminum coating layer, and a second aluminum coating layer provided on a second surface of the steel sheet, as an outermost surface of the steel sheet. Further provided are a coated steel sheet coil using this coated steel sheet, and a method of producing a hot-press formed article, as well as an automobile part using a press formed article produced by the method of producing a hot-press formed article.