| 摘要 |
PURPOSE:To obtain an austenitic stainless steel having superior resistance to an intergranular corrosion in environment in which neutrons are irradiated by specifying a composition consisting of C, Mn, P, S, Si, Cr, Ni, Mo and Fe and by making grains fine. CONSTITUTION:This stainless steel having the resistance to the intergranular corrosion consists of, by weight, <=0.08% C, <=2.00% Mn, <=0.045% P, <=0.030% S, <=1.00% Si, 18.00-20.00% Cr, 8.00-10.50% Ni, <=0.03% Mo and the balance Fe and has ASTM grain size No. >=7.0. The steel does not cause stress corrosion cracking even under the irradiation of a large dose of neutrons. The steel is obtd. by lowering the concn. of Mo in an austenitic stainless steel and making the grain size of the steel as small as No. >=7.0. By the small grain size, the total length of the grain boundaries is increased to lower the concns. of C, Si, P and S segregated on the grain boundaries, so the sensitivity to stress corrosion cracking is reduced.
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