Patent ID: 8133431
Filing Date: 2012-03-13
Classification: C22C

Abstract:
1. An austenitic stainless steel, which consists of by mass percent, C: not more than 0.02%, Si: not more than 1.5%, Mn: not more than 2%, Cr: 17 to 25%, Ni: 9 to 13%, N: 0.06 to 0.35%, sol. Al: 0.008 to 0.03% and further contains one or more elements selected from Nb: not more than 0.5%, Ti: not more than 0.4%, V: not more than 0.4%, Ta: not more than 0.2%, Hf: not more than 0.2% and Zr: not more than 0.2%, with the balance being Fe and impurities, in which the contents of P, S, Sn, As, Zn, Pb and Sb among the impurities are P: 0.006 to 0.04%, S: 0.0004 to 0.03%, Sn: 0.001 to 0.1%, As: not more than 0.01%, Zn: not more than 0.01%, Pb: not more than 0.01% and Sb: not more than 0.01%, and the values of F1 and F2 defined respectively by the following formula (1) and formula (2) satisfy the conditions F1≦0.075 and 0.05≦F2≦1.7−9×F1; wherein each element symbol in the formulas (1) and (2) represents the content by mass percent of the element concerned.