| 摘要 |
<p>An austenitic stainless steel, which comprises by mass%, C < 0.04%, Si ‰¤ 1.5%, Mn ‰¤ 2%, Cr: 15 to 25%, Ni: 6 to 30%, N: 0.02 to 0.35%, sol. Al ‰¤ 0.03% and further contains one or more elements selected from Nb ‰¤ 0.5%, Ti ‰¤ 0.4%, V ‰¤ 0.4%, Ta ‰¤ 0.2%, Hf ‰¤ 0.2% and Zr ‰¤ 0.2%, with the balance being Fe and impurities, and among the impurities P ‰¤ 0.04%, S ‰¤ 0.03%, Sn ‰¤ 0.1%, As ‰¤ 0.01%, Zn ‰¤ 0.01%, Pb ‰¤ 0.01% and Sb ‰¤ 0.01%, and satisfy the conditions F1 = S + {(P + Sn)/2} + {(As + Zn + Pb + Sb)/5} ‰¤ 0.0075 and 0.05 ‰¤ F2 = Nb + Ta + Zr + Hf + 2Ti + (V/10) ‰¤ 1.7 - 9 × F1 has not only excellent liquation cracking resistance in the HAZ on the occasion of welding and excellent embrittling cracking resistance in the HAZ during a long period of use at high temperatures but also excellent polythionic acid SCC resistance and high temperature strength.</p> |
