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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 9255319 B1

PDFFull Text
Date of Patent:
Feb. 09, 2016

Filed:

Aug. 12, 2011

Cr-containing austenitic alloy tube and method for producing the same

Applicants:

Yasuhiro Masaki, Osaka, JP;

Masahito Tasaka, Suita, JP;

Manabu Kanzaki, Amagasaki, JP;

Akihiro Uehira, Kashiba, JP;

Shoji Kinomura, Takarazuka, JP;

Inventors:

Yasuhiro Masaki, Osaka, JP;

Masahito Tasaka, Suita, JP;

Manabu Kanzaki, Amagasaki, JP;

Akihiro Uehira, Kashiba, JP;

Shoji Kinomura, Takarazuka, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Clark & Brody

Primary Examiner:

Vera Katz

Int. Cl.
CPC ...
C23C 8/18 (2006.01); F16L 9/02 (2006.01); C22C 19/05 (2006.01); G21D 1/00 (2006.01); C21D 6/00 (2006.01); C21D 8/10 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/42 (2006.01); C21D 9/08 (2006.01); C22F 1/00 (2006.01); C22F 1/10 (2006.01); G21F 9/28 (2006.01); C22C 38/58 (2006.01);
U.S. Cl.
CPC ...
C23C 8/18 (2013.01); C21D 6/002 (2013.01); C21D 8/10 (2013.01); C21D 9/08 (2013.01); C22C 19/05 (2013.01); C22C 19/058 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); C22C 38/58 (2013.01); C22F 1/00 (2013.01); C22F 1/10 (2013.01); F16L 9/02 (2013.01); G21D 1/006 (2013.01); G21F 9/28 (2013.01); Y02E 30/40 (2013.01);
Abstract

There is provided a Cr-containing austenitic alloy tube, wherein a chromium oxide film with a thickness of 0.05 to 1.5 μm having the relationship defined by Formula (i) is formed on the inner surface of the tube, wherein the average concentration of C in the depth range of 5 to 10 μm from the inner surface is lower than the concentration of C in a base metal;0.4≦δ1/δ2≦2.5  (i)wherein δ1 and δ2 are thicknesses (μm) of the chromium oxide film at both ends of tube, respectively.

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