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.:
Date of Patent:
Feb. 18, 2014
Filed:
Feb. 22, 2006
Eiji Tsuru, Futtsu, JP;
Takuya Hara, Futtsu, JP;
Hitoshi Asahi, Futtsu, JP;
Hiroshi Morimoto, Futtsu, JP;
Yoshio Terada, Kimitsu, JP;
Tatsuya Yoshida, Kimitsu, JP;
Kouichi Shinada, Futtsu, JP;
Eiji Tsuru, Futtsu, JP;
Takuya Hara, Futtsu, JP;
Hitoshi Asahi, Futtsu, JP;
Hiroshi Morimoto, Futtsu, JP;
Yoshio Terada, Kimitsu, JP;
Tatsuya Yoshida, Kimitsu, JP;
Kouichi Shinada, Futtsu, JP;
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Abstract
The present invention provides a high strength welded steel pipe superior in weld zone embrittlement crack characteristics and a method of production of the same, that is, a method of production of a welded steel pipe superior in hydrogen embrittlement cracking resistance of weld metal characterized by seam welding from the inner and outer surfaces by a tensile strength of 850 MPa or more, then expanding or reducing the size of the pipe for correction, which method of production of welded steel pipe characterized in that the hydrogen concentration of the preceding weld metal is 0.2 cc or less per 100 g at ordinary temperature.