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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 10640843 B1

PDFFull Text
Date of Patent:
May. 05, 2020

Filed:

Feb. 15, 2016

High strength electric resistance welded steel pipe and method for producing high strength electric resistance welded steel pipe

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Tetsuo Ishitsuka, Tokyo, JP;

Shuji Iwamoto, Tokyo, JP;

Takashi Tsusue, Tokyo, JP;

Shunichi Kobayashi, Tokyo, JP;

Osamu Yoshida, Tokyo, JP;

Hideto Kawano, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
C21D 6/00 (2006.01); C21D 8/10 (2006.01); C21D 9/50 (2006.01); C21D 9/08 (2006.01); C22C 38/58 (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 38/02 (2006.01); C22C 38/00 (2006.01); B21B 1/02 (2006.01); B21B 1/22 (2006.01); F16L 9/17 (2006.01); B23K 11/087 (2006.01); C21D 8/02 (2006.01); C22C 38/16 (2006.01); C22C 38/08 (2006.01); B23K 11/16 (2006.01); C22C 38/04 (2006.01); C22C 38/14 (2006.01); C21D 9/46 (2006.01); C22C 38/12 (2006.01); C22C 38/26 (2006.01); C22C 38/18 (2006.01); C22C 38/20 (2006.01); C22C 38/40 (2006.01); C22C 38/22 (2006.01); C22C 38/28 (2006.01); F16L 9/16 (2006.01); F16L 9/00 (2006.01); B32B 15/00 (2006.01); B32B 1/08 (2006.01); B23K 103/04 (2006.01); B23K 101/06 (2006.01);
U.S. Cl.
CPC ...
C21D 9/505 (2013.01); B21B 1/026 (2013.01); B21B 1/22 (2013.01); B23K 11/0873 (2013.01); B23K 11/16 (2013.01); B32B 1/08 (2013.01); B32B 15/00 (2013.01); C21D 6/001 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/02 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0263 (2013.01); C21D 8/105 (2013.01); C21D 9/08 (2013.01); C21D 9/085 (2013.01); C21D 9/46 (2013.01); C21D 9/50 (2013.01); C22C 38/00 (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 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (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 38/58 (2013.01); F16L 9/00 (2013.01); F16L 9/16 (2013.01); F16L 9/165 (2013.01); F16L 9/17 (2013.01); B21B 2001/028 (2013.01); B21B 2001/225 (2013.01); B23K 2101/06 (2018.08); B23K 2103/04 (2018.08); C21D 2211/005 (2013.01); Y10T 428/12799 (2015.01); Y10T 428/12951 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/13 (2015.01); Y10T 428/26 (2015.01);
Abstract

Electric resistance welded steel pipe securing the high strength and high toughness demanded from oil well pipe in recent years. The metal structure in a region having a width of 0.5 mm in both the thickness directions from a reference point, when using a point defined as a point ¼ of the thickness in the thickness direction from the surface in the base material part of the steel as the reference point, consists of polygonal ferrite: 10 area % or less and a balance: bainitic ferrite. The thickness is 15 mm or more.

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