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. 05, 2023
Filed:
Dec. 05, 2019
Nippon Steel Corporation, Tokyo, JP;
Hiroyuki Hirata, Tokyo, JP;
Kana Jotoku, Tokyo, JP;
Shinnosuke Kurihara, Tokyo, JP;
Katsuki Tanaka, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
A method of producing a ferritic heat-resistant steel welded joint, the method including: a multi-layer welding step in which a ferritic heat-resistant steel base material including B at 0.006% by mass to 0.023% by mass is multi-layer welded using a Ni-based welding material for heat-resistant alloy, wherein root pass welding is performed under a welding condition such that a ratio of an area [S] that has been melted of the ferritic heat-resistant steel base material to an area [S] of a weld metal, in a transverse cross-section of a weldment after the root pass welding but before second pass welding in the multi-layer welding step, satisfies the following formula (1): 0.1≤[S]/[S]≤−50×[% B]+1.3, with respect to a mass percent of B, [% B], which is included in the ferritic heat-resistant steel base material.