| 摘要 |
<p>An austenitic stainless steel, which consists of by mass %, C ‰¤ 0.02%, Si: 0.01 to 0.50%, Mn: 0.01 to 2.0%, Cr: 24 to 26%, Ni: 19 to 22%, Mo: more than 0.10% to less than 0.50%, N: more than 0.04% to not more than 0.15%, and one or two elements selected from Nb ‰¤ 0.30% and V ‰¤ 0.40%, with the balance being Fe and impurities, and among the impurities P ‰¤ 0.030%, S ‰¤ 0.002% and Sn ‰¤ 0.015%, and satisfies [2.5 ‰¤ 36Nb + 53V + 15N ‰¤ 25.0] and [S + {(P + Sn) / 2 ‰¤ -5.76 × 10 -4 × (36Nb + 53V + 15N) + 0.0267] has excellent corrosion resistance, in particular, excellent intergranular corrosion resistance, and further has excellent crack insusceptibility in a weld heat affected zone. This austenitic stainless steel is a particularly excellent material as structural members for a nuclear power plant.</p> |
