B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
148/34.1
B23K 11/093 (2006.01) C21D 8/10 (2006.01) C21D 9/08 (2006.01) C21D 9/14 (2006.01)
Patent
CA 1270426
ABSTRACT OF THE DISCLOSURE A method for the production of an electric seam welded steel pipe for oil-well use which has good resistance to collapse pressure and souring by providing a steel containing 0.08 - 0.26% C by weight, 0.8 - 1.9% Mn by weight, 0.5% or less Si by weight, the remainder being Fe and unavoidable impurities, subjecting the steel to hot rolling, and hardening, and coiling the treated steel at a temperature not exceeding 250°C, the steel is then formed into tubular form and welded by electric resistance welding to produce an electric seam welded pipe, and the weld heat affected zones of the pipe are subjected to heating to a temperature of 900°C or more to effect hardening, and then the whole pipe is tempered.
510044
Koyuba Motofumi
Murayama Hiroshi
Yamamoto Youji
Fetherstonhaugh & Co.
Nippon Steel Corporation
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