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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 11203793 B1

PDFFull Text
Date of Patent:
Dec. 21, 2021

Filed:

May. 26, 2016

Steel pipe for fuel injection pipe and method for producing the same

Applicants:

Usui Co., Ltd., Shizuoka, JP;

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Tatsuya Masuda, Shizuoka, JP;

Tsugumi Yamazaki, Shizuoka, JP;

Hiroaki Kondo, Shizuoka, JP;

Taizo Makino, Tokyo, JP;

Masahiro Yamazaki, Tokyo, JP;

Katsunori Nagao, Tokyo, JP;

Assignees:

USUI CO., LTD., Shizuoka, JP;

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Clark & Brody LP

Primary Examiner:

Nicholas A Wang

Assistant Examiner:

Anthony M Liang

Int. Cl.
CPC ...
C21D 9/08 (2006.01); C21D 7/04 (2006.01); C21D 8/10 (2006.01); C21D 1/28 (2006.01); C22C 38/50 (2006.01); C22C 38/48 (2006.01); C22C 38/46 (2006.01); C22C 38/44 (2006.01); C22C 38/42 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); F02M 55/02 (2006.01); F16L 9/02 (2006.01); F02M 55/00 (2006.01); C22C 38/58 (2006.01);
U.S. Cl.
CPC ...
C21D 9/085 (2013.01); C21D 1/28 (2013.01); C21D 7/04 (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 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/58 (2013.01); F02M 55/00 (2013.01); F02M 55/02 (2013.01); F16L 9/02 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/009 (2013.01);
Abstract

A steel pipe for fuel injection pipe has a tensile strength of 500 to 900 MPa and a yield ratio of 0.50 to 0.85, and has a critical internal pressure (IP) satisfying [IP≥0.41×TS×α] (α=[(D/d)−1]/[0.776×(D/d)], where TS: tensile strength (MPa) of the steel pipe, D: steel pipe outer diameter (mm), and d: steel pipe inner diameter (mm)), wherein a circumferential-direction residual stress on an inner surface of the pipe is −20 MPa or lower after the steel pipe is split in half in a pipe axis direction.

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