Jfe Steel Corporation

Minako Morimoto

Masahiro Yoshida

Satoru Ando

Seiji Nakajima

Provided is a hot-pressed member excellent in terms of paint adhesiveness and a method of manufacturing the hot-pressed member. A hot-pressed member has a coating layer containing Zn and Ni on the surface of a steel sheet of which the member is formed, an oxide film containing Zn on the coating layer, and a void formation rate is 80% or less for voids formed between the coating layer and the oxide film.

Hot-pressed member and method of manufacturing the same

A method of manufacturing a hot-pressed member including heating a coated steel sheet to 850&#xb0; C. to 950&#xb0; C., the coated steel sheet including a substrate steel sheet and a coating layer formed on the substrate steel sheet and containing 10% to 25% by mass of Ni and the balance being Zn and incidental impurities, in which the coating weight of the coating layer is 10 to 90 g/mper a side; and starting hot press forming when the temperature of the coated steel sheet which has been heated is 650&#xb0; C. to 800&#xb0; C.

Method of manufacturing hot-pressed member

A steel sheet for hot press-forming having a first coating layer on a surface of the steel sheet, containing 60% or more by mass Ni and a remainder composed of Zn and incidental impurities, a coating mass thereof being more than 5 g/mand 50 g/mor less per side, and a second coating layer on the first coating layer, containing 10% to 25% by mass Ni and a remainder composed of Zn and incidental impurities, a coating mass thereof being 10 to 90 g/mper side.

Growing community of inventors

Tokyo, Japan

Minako Morimoto