Method of manufacturing cold worked, high strength seamless...

Details Method of manufacturing cold worked, high strength seamless... Method of manufacturing cold worked, high strength seamless...

2005-04-19

2005-04-19

Bryant, David P. (Department: 3726)

Metal working

Method of mechanical manufacture

With testing or indicating

C072S368000, C138S171000, C228S173600, C219S121460

Reexamination Certificate

active

06880220

ABSTRACT:
A process produces a welded seamless PIPE having good yield strength and excellent corrosion and/or erosion resistance. Up to a maximum outside diameter corrosion and/or erosion resistant CRA PIPE is cold worked from a welded hollow, rather than using the traditional seamless pierced hollow method. A high-speed roll-forming mill is also utilized, rather than using the slow traditional break press to form the welded hollow. Welded hollow dimensions can be achieved which comply with the method of cold working's capability to produce the yield strengths and dimensional tolerances required to meet the service criteria of the PIPE's intended application.

REFERENCES:
patent: 4885215 (1989-12-01), Yoshioka et al.
patent: 5600069 (1997-02-01), Girndt et al.
patent: 5677490 (1997-10-01), Gunther et al.
patent: 5867275 (1999-02-01), Curtis et al.
patent: 6375059 (2002-04-01), Ohnishi et al.
patent: 6532995 (2003-03-01), Asahi et al.

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