STEEL SHEET, PLATED STEEL SHEET, PRESS-MOLDED ARTICLE, PROCESSED MEMBER, PRODUCTION METHOD FOR PRESS-MOLDED ARTICLE, AND PRODUCTION METHOD FOR PROCESSED MEMBER

WIPO Patent Application WO/2023/171143

A1

The purpose of the present invention is to effectively inhibit the occurrence of delayed fracture at a shear end surface of a member in which there is a concern regarding occurrence of delayed fracture in a press-molded article obtained by using a high-strength steel sheet or a plated steel sheet including the high-strength steel sheet as a base sheet. This steel sheet has, on a surface thereof, a coating containing an organic resin and an inorganic material. In the coating, the concentration of the inorganic material in a 20%-coating region on the steel sheet side in the thickness direction is higher than the concentration of the inorganic material in a 20%-coating region on the surface layer side. The steel sheet has a tensile strength of at least 1180 MPa.

HATA Kentaro (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, JP)
MORIMOTO Minako (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, JP)
OTSUKA Shinji (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, JP)
TAKAGI Shusaku (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, JP)

PCT/JP2023/001450

September 14, 2023

January 19, 2023

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JFE STEEL CORPORATION (Chiyoda-ku Tokyo, 11, JP)

C23C26/00; B21D22/20; C23C2/06; C23C28/00; C25D5/26; C25D7/00; C09D5/00

KUMASAKA Akira et al. (JFE Techno-Research Corporation 7-1, Otemachi 2-chome, Chiyoda-k, Tokyo 04, JP)

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