公开(公告)号：US20210222265A1

公开(公告)日：2021-07-22

申请号：US17153848

申请日：2021-01-20

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Qi LU ,  Jianfeng WANG ,  Shane M. ANDERSON ,  Curt D. HORVATH ,  Jason J. CORYELL

IPC: C21D6/00 ,  C22C38/38 ,  C22C38/34 ,  C22C38/20 ,  C21D1/18 ,  C21D9/46 ,  C21D8/00

Abstract: A steel composition is provided. The steel composition includes 0.1-0.45 wt. % carbon (C), greater than 0-4.5 wt. % manganese (Mn), 0.5-5 wt. % chromium (Cr), 0.5-2.5 wt. % silicon (Si), greater than 0-2 wt. % copper (Cu), and a balance of iron (Fe). The combined concentration of the Mn, Cr, and Cu is greater than about 2 wt. %. The steel composition is configured to form a surface oxide layer comprising oxides of Cr, Si, and Cu after being subjected to press hardening. Press-hardened steel fabricated from the steel composition and a method of fabricating a press-hardened steel component from the steel composition are also provided.