公开(公告)号：US20220226886A1

公开(公告)日：2022-07-21

申请号：US17616525

申请日：2020-06-03

Applicant: JFE STEEL CORPORATION

Inventor： Kenji TSUZUMI ,  Hideya MASAKI

IPC: B22D11/16 ,  B22D11/108 ,  C22C38/38 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C04B35/14

Abstract: A mold powder which prevents surface defects from occurring on a surface of a cast slab of Al-containing hypo-peritectic steel having Al: 0.2% to 2.0%, by mass %, and, in a hypo-peritectic region, C: 0.08% to 0.17%, by mass %. The mold powder includes CaO, SiO2, Na2O, Li2O, F, and C. Li2O/Na2O is 0.6 or more, 1.0+0.05×Al≤CaO/SiO2≤2.0−0.35×Al, 10