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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.:

US 8852362 B1

PDFFull Text
Date of Patent:
Oct. 07, 2014

Filed:

Jun. 01, 2012

Austenitic stainless steel pipe excellent in steam oxidation resistance and manufacturing method therefor

Applicants:

Yoshitaka Nishiyama, Nishinomiya, JP;

Mitsuru Yoshizawa, Amagasaki, JP;

Masahiro Seto, Nishinomiya, JP;

Katsuki Tanaka, Nishonimiya, JP;

Inventors:

Yoshitaka Nishiyama, Nishinomiya, JP;

Mitsuru Yoshizawa, Amagasaki, JP;

Masahiro Seto, Nishinomiya, JP;

Katsuki Tanaka, Nishonimiya, JP;

Assignee:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Attorney:

Clark & Brody

Primary Examiner:

Roy King

Assistant Examiner:

Caitlin Kiechle

Int. Cl.
CPC ...
C22C 38/18 (2006.01); C21D 11/00 (2006.01); C22C 38/40 (2006.01); C21D 7/06 (2006.01); B21C 37/30 (2006.01); F28F 21/08 (2006.01); C22C 38/04 (2006.01); C21D 9/00 (2006.01); C22C 38/00 (2006.01); C22C 38/42 (2006.01); B21K 21/00 (2006.01); B21C 37/06 (2006.01); F16L 9/02 (2006.01); C22C 38/02 (2006.01); C21D 6/00 (2006.01); F22B 37/10 (2006.01); C22C 38/48 (2006.01); C21D 8/10 (2006.01); C21D 9/08 (2006.01); C22C 38/44 (2006.01);
U.S. Cl.
CPC ...
C21D 6/004 (2013.01); F28F 21/083 (2013.01); C22C 38/04 (2013.01); C21D 9/0068 (2013.01); C22C 38/001 (2013.01); C22C 38/42 (2013.01); B21K 21/00 (2013.01); C21D 7/06 (2013.01); B21C 37/06 (2013.01); F16L 9/02 (2013.01); C22C 38/02 (2013.01); F22B 37/10 (2013.01); C21D 2211/001 (2013.01); C22C 38/48 (2013.01); C21D 8/105 (2013.01); C21D 9/08 (2013.01); C22C 38/44 (2013.01); Y10S 148/909 (2013.01);
Abstract

There is provided an austenitic stainless steel pipe excellent in steam oxidation resistance. The austenitic stainless steel pipe excellent in steam oxidation resistance contains, by mass percent, 14 to 28% of Cr and 6 to 30% of Ni, and is configured so that a region satisfying the following Formula exists in a metal structure at a depth of 5 to 20 μm from the inner surface of the steel pipe:(α/β)×δ/ε×100≧0.3where the meanings of symbols in the above Formula are as follows:α: sum total of the number of pixels of digital image in region in which orientation difference of adjacent crystals detected by electron backscattering pattern is 5 to 50 degreesβ: the number of total pixels of digital image in region of measurement using electron backscattering patternε: analysis pitch width of electron backscattering pattern (μm)δ: grain boundary width (μm).

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