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1. (WO2017017905) METHOD FOR PRODUCING HOT-PRESSED MEMBER

Pub. No.:    WO/2017/017905    International Application No.:    PCT/JP2016/003196
Publication Date: Fri Feb 03 00:59:59 CET 2017 International Filing Date: Wed Jul 06 01:59:59 CEST 2016
IPC: B21D 22/20
C23C 2/06
C23C 2/26
C23C 2/40
C25D 5/26
C25D 5/48
B21D 22/26
Applicants: JFE STEEL CORPORATION
JFEスチール株式会社
Inventors: NAKAJIMA, Seiji
中島 清次
ANDO, Satoru
安藤 聡
Title: METHOD FOR PRODUCING HOT-PRESSED MEMBER
Abstract:
Provided is a method for producing a hot-pressed member having excellent surface appearance, which enables stable production of a hot-pressed member that has a uniform and good surface appearance without causing a significant increase of the cost. In a method for producing a hot-pressed member wherein hot pressing and cooling are performed after heating a galvanized steel sheet within a temperature range from the Ac3 transformation point to 1,000°C, the galvanized steel sheet is subjected to a surface purification treatment before the heating. In a method for producing a hot-pressed member wherein a galvanized steel sheet is heated within a temperature range from the Ac3 transformation point to 1,000°C and cooled after cold pressing the galvanized steel sheet, the galvanized steel sheet is subjected to a surface purification treatment before the heating. The galvanized steel sheet is preferably a Zn-Ni alloy plated steel sheet which contains 10-25% by mass of Ni with the balance made up of Zn and unavoidable impurities, while having a plating layer on one surface or both surfaces, with the adhesion amount per one surface being 10-90 g/m2.