Patent ID: 7316143
Filing Date: 2008-01-08
Classification: C21D,C22C,Y10S

Abstract:
1. A seamless steel tube, comprising, in mass %, C: 0.30 to 0.50%, Si: not more than 0.5%, Mn: 0.3 to 2.0%, P: not more than 0.025%, S: not more than 0.005%, Cr: 0.15 to 1.0%, Al: 0.001 to 0.05%, Ti: 0.005 to 0.05%, N: not more than 0.02%, B: 0.0005 to 0.01% and O (oxygen): not more than 0.0050%, the balance being Fe and impurities, wherein Beff defined in an equation (a) or (b) as below is not less than 0.0001;