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:
Dec. 09, 2025
Filed:
Jan. 25, 2021
Daido Steel Co., Ltd., Nagoya, JP;
Nobuyuki Takahashi, Nagoya, JP;
Akihiko Okamoto, Nagoya, JP;
Chihiro Furusho, Nagoya, JP;
Hiroyuki Takabayashi, Nagoya, JP;
Yoshihiko Koyanagi, Nagoya, JP;
DAIDO STEEL CO., LTD, Nagoya, JP;
Abstract
The present invention relates to a precipitation-hardening martensitic stainless steel, containing: 0<C<0.10 mass %, 0<Si≤0.20 mass %, 0<Mn≤1.00 mass %, 8.0 mass %≤ Ni≤15.0 mass %, 8.0 mass %≤Cr≤14.0 mass %, 0.4 mass %≤Nb≤2.50 mass %, and the balance being Fe and inevitable impurities. The precipitation-hardening martensitic stainless steel has a 0.2% proof stress of 1,300 MPa or more at room temperature and has an absorption energy of 30 J or more at room temperature. The precipitation-hardening martensitic stainless steel has an absorption energy of 10 J or more at −40° C.