| 摘要 |
Provided is an austenitic stainless steel which exhibits excellent weldability and which is suitable for an apparatus that has a welded pipe structure and that is to be used at high temperature. The austenitic stainless steel contains, in mass%, 0.001 to 0.2% of C, 0.01 to 1.5% of Si, 0.01 to 1.5% of Mn, up to 0.022% of P, up to 0.004% of S, 20.0 to 26.0% of Cr, 15.0 to 23.0% of Ni, 0.001 to 0.07% of N, 0.003 to 0.05% of Al and 0.0003 to 0.005% of Ca, with the contents of Al and Ca satisfying the relationship (1) 0.015 ‰¤ 0.29(%Al) + 17.92 (%Ca) ‰¤ 0.093 (1), and may further contain one or more selected from among Cu, Mo, Sn, W, Co, Ti, Nb, V, Zr, B, Mg and REMs in a prescribed amount. |
