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:
Jul. 20, 2021
Filed:
Oct. 19, 2016
Applicant:
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Inventors:
Hiroki Kamitani, Tokyo, JP;
Taro Oe, Tokyo, JP;
Assignee:
NIPPON STEEL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 9/08 (2006.01); C22C 38/54 (2006.01); C21D 6/00 (2006.01); C21D 8/10 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/00 (2006.01); C21D 1/25 (2006.01); C22C 38/06 (2006.01); C22C 38/50 (2006.01); C21D 1/19 (2006.01);
U.S. Cl.
CPC ...
C21D 9/08 (2013.01); C21D 1/25 (2013.01); C21D 6/004 (2013.01); C21D 6/008 (2013.01); C21D 8/105 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C21D 1/19 (2013.01); C21D 8/10 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01);
Abstract
A method of manufacturing a stainless steel pipe includes preparing a hollow shell having a composition (mass %): up to 0.05% C; up to 1.0% Si; 0.01 to 1.0% Mn; up to 0.05% P; below 0.002% S; 0.001 to 0.1% Al; 16.0 to 18.0% Cr; 3.0 to 5.5% Ni; 1.8 to 3.0% Mo; 1.0 to 3.5% Cu; up to 0.05% N; up to 0.05% O; 0 to 0.3% Ti; 0 to 0.3% Nb; 0 to 0.3% V; 0 to 2.0% W; 0 to 0.01% Ca; 0 to 0.01% B; the balance Fe and impurities, holding the shell in a temperature range of 420 to 460° C. for 60 to 180 minutes; and then holding the shell in a temperature range of 550 to 600° C. for 5 to 300 minutes.