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. 04, 2017
Filed:
May. 28, 2012
Applicants:
Yoshitaka Nishiyama, Nishinomiya, JP;
Mitsuharu Yonemura, Takarazuka, JP;
Inventors:
Yoshitaka Nishiyama, Nishinomiya, JP;
Mitsuharu Yonemura, Takarazuka, JP;
Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C 38/40 (2006.01); F22B 37/10 (2006.01); C21D 6/00 (2006.01); C21D 9/14 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/48 (2006.01); F16L 9/02 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C22C 38/58 (2006.01); C21D 7/06 (2006.01);
U.S. Cl.
CPC ...
F22B 37/10 (2013.01); C21D 6/004 (2013.01); C21D 9/14 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); F16L 9/02 (2013.01); C21D 7/06 (2013.01);
Abstract
There is provided an austenitic stainless steel tube containing, by mass percent, 14 to 28% of Cr and 6 to 30% of Ni, wherein the steel tube has a metal micro-structure, in which an average dislocation density, which is determined by XRD measurement using a Co tube, is 3.0×10/mor higher, on the inner surface side of the steel tube. The crystal grain size of the steel tube is preferably 50 μm or smaller. The steel tube of the present invention is suitable as a steel tube used in power-generating plants.