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1. (WO2017038556) COATING FILM, HOT-FORMING DIE, AND HOT FORMING METHOD

Pub. No.:    WO/2017/038556    International Application No.:    PCT/JP2016/074500
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Wed Aug 24 01:59:59 CEST 2016
IPC: B21D 37/01
B21D 22/20
B21D 24/00
B21D 37/20
Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
株式会社神戸製鋼所
Inventors: YAMAMOTO, Kenji
山本 兼司
Title: COATING FILM, HOT-FORMING DIE, AND HOT FORMING METHOD
Abstract:
Provided is a coating film 12 which is formed as an anti-wear layer on a hot-forming die 1 used for hot molding of a steel sheet 10. The coating film 12 is characterized by comprising tungsten carbide, and 3-15 wt% of residual cobalt. The hot-forming die 1 is intended to be used in hot forming of the steel sheet 10, and is provided with: a base material 11 that has a forming surface 11A; and the coating film 12 formed on the forming surface 11A. The hot forming method comprises a step for heating the steel sheet 10, and a step for forming the heated steel sheet 10 by using the hot-forming die 1.