The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 2024
Filed:
Jun. 03, 2020
Jfe Steel Corporation, Tokyo, JP;
Kenji Tsuzumi, Tokyo, JP;
Hideya Masaki, Tokyo, JP;
JFE STEEL CORPORATION, Tokyo, JP;
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, SiO, NaO, LiO, F, and C. LiO/NaO is 0.6 or more, 1.0+0.05×Al≤CaO/SiO≤2.0−0.35×Al, 10<LiO+0.5×NaO+0.8×F<20, and 1.00≤F/(LiO+0.5×NaO+1.46)≤1.24 are satisfied where Al is content by mass % of molten steel, and respective contents of the remaining elements are by mass %. A viscosity of the mold powder at 1,300° C. is in a range of 0.05 Pa·s to 0.20 Pa·s, and a crystallization temperature of the mold powder is in a range of 1,100° C. to 1,250° C.