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:
Sep. 02, 2025
Filed:
Mar. 14, 2022
Nippon Steel Corporation, Tokyo, JP;
Takashi Doi, Tokyo, JP;
Kenji Kobayashi, Tokyo, JP;
Naomi Inatomi, Tokyo, JP;
Yuki Suzuki, Tokyo, JP;
Soshi Fujita, Tokyo, JP;
Masahiro Fuda, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
A hot-stamped product with improved delayed-fracture resistance is provided. The hot-stamped productincludes: a steel substrate; and an Al filmformed on the steel substrate, the Al filmincluding: an interface layerlocated at the interface with the steel substrateand with part of the αFe substituted by Al and Si; an intermediate layerformed on the interface layer; and an oxide layer formed on the intermediate layer, the intermediate layerincluding an Fe—Al—Si phasewith part of the αFe substituted by Al and Si, the Fe—Al—Si phaseincluding one or more elements selected from the group consisting of Zr, Ce, Y, Ta, Ni, Cu, Nb, Cr, Co, V and Ti, the oxide layerincluding one or more elements selected from the group consisting of Be, Mg, Ca, Sr, Ba, Sc and Zn.