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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 10017834 B1

PDFFull Text
Date of Patent:
Jul. 10, 2018

Filed:

Aug. 19, 2016

High-strength stainless steel pipe

Applicant:

Nisshin Steel Co., Ltd., Tokyo, JP;

Inventors:

Seiichi Isozaki, Yamaguchi, JP;

Yasutoshi Hideshima, Yamaguchi, JP;

Hiroshi Fujimoto, Yamaguchi, JP;

Satoshi Suzuki, Yamaguchi, JP;

Assignee:

NISSHIN STEEL CO., LTD., Tokyo, JP;

Attorney:

McDermott Will & Emery LLP

Primary Examiner:

Keith Walker

Assistant Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C21D 9/50 (2006.01); C21D 6/00 (2006.01); C21D 8/10 (2006.01); C21D 9/08 (2006.01); C21D 9/14 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/18 (2006.01); C22C 38/40 (2006.01); C22C 38/00 (2006.01); C22C 38/42 (2006.01);
U.S. Cl.
CPC ...
C21D 9/50 (2013.01); C21D 6/002 (2013.01); C21D 6/004 (2013.01); C21D 6/008 (2013.01); C21D 8/10 (2013.01); C21D 8/105 (2013.01); C21D 9/08 (2013.01); C21D 9/14 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/18 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); Y02P 10/212 (2015.11);
Abstract

A stainless steel material having compositions which contain on the basis of percent by mass, C from 0.04 to 0.12%, Ni from 0 (including a case of no addition) to 5.0%, Cr from 12.0 to 17.0%, N from 0.0 to 0.10%, Si from 0.2 to 2.0%, Mn at 2.0% or less, Cu from 0.0 to 2.0%, P at 0.06% or less, S at 0.006% or less, with residue being Fe and unavoidable impurities. Further, a parent phase has any one of a single phase structure of ferrite phase or martensite phase and a diploid phase structure of ferrite phase and martensite phase. An end of the base material is melt-welded as a joint to form a pipe. The parent phase is provided with carbide uniformly separated at grain boundaries and within grains, with a dissolved amount of C being 0.03% by mass or less.

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