Electric resistance welded steel tube for machine structural use

Details Electric resistance welded steel tube for machine structural use Electric resistance welded steel tube for machine structural use

1991-11-20

1993-05-25

Yee, Deborah

Metal treatment

Stock

Ferrous

148333, 148320, 148909, 420 84, 138177, C22C 3804, C22C 3660

Patent

active

052136337

ABSTRACT:
An electric resistance welded steel pipe for machine structural use exhibiting excellent machinability comprises, in weight percent, 0.02-0.60% C, not more than 0.4% Si, 0.20-2.0% Mn, not more than 0.030% P, not more than 0.040% S, 0.001--0.030% T.Al, 0.0020-0.0100% N, not more than 0.0060% O, and one or both of not more than 0.040% Bi, not more than 0.040% Pb and not, Te and provided that the total amount of Bi and pb is not more than 0.050%, the remainder being Fe and unavoidable impurities. It may further comprise one or both of 0.10-1.50% Cr and 0.10-0.60% Mo and/or not more than 0.020% Ca, provided that Ca%/(1.25.times.0%+0.625.times.S%).gtoreq.0.05.

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