公开(公告)号：US20200094525A1

公开(公告)日：2020-03-26

申请号：US16467295

申请日：2017-01-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Genki ABUKAWA ,  Kunio HAYASHI ,  Kazuo HIKIDA ,  Kaoru KAWASAKI

IPC: B32B15/01 ,  C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00

Abstract: A steel sheet for hot stamping includes a steel structure represented by an area fraction of bainite, fresh martensite and tempered martensite: 80% or more in total, and a product of a number density (pieces/μm2) of carbides and a proportion of carbides precipitated into prior austenite grains in carbides: 0.50 or more.