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:
Apr. 22, 2014
Filed:
Dec. 31, 2009
Masayuki Sagara, Nishinomiya, JP;
Hitoshi Suwabe, Itami, JP;
Hisashi Amaya, Kyoto, JP;
Shigemitsu Kimura, Nishinomiya, JP;
Masaaki Igarashi, Sanda, JP;
Masayuki Sagara, Nishinomiya, JP;
Hitoshi Suwabe, Itami, JP;
Hisashi Amaya, Kyoto, JP;
Shigemitsu Kimura, Nishinomiya, JP;
Masaaki Igarashi, Sanda, JP;
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Abstract
A method for manufacturing a high alloy pipe comprises hot working, a high alloy material pipe having controlled amounts of C, Si, Mn, P, S, Ni, Cr, Mo, Cu, Al, N, O, and optionally Ca, Mg, and rare earth elements, with the balance Fe. The pipe composition satisfies the formula N×O≦0.001. The pipe is subjected to cold working to form the high alloy pipe, wherein the final cold working process is performed under the condition that a working ratio Rd in the reduction of area satisfies 15≦Rd (%)≦370×(C+N), where N, O and C are the contents (by mass percent) of the respective elements, and Rd is the working ratio (%) in the reduction of area. The pipe has an excellent ductility and an excellent corrosion resistance when cold working is performed to obtain a high strength after pipe-making.