DISPERSION STRENGTHENED AUSTENITIC STAINLESS STEEL, METHOD FOR MANUFACTURING STAINLESS STEEL AND PRODUCT MADE FROM STAINLESS STEEL

摘要

An objective of the invention is to provide an austenitic stainless steel article having superior irradiation resistance and stress corrosion cracking resistance than before while maintaining mechanical properties equivalent to those of conventional ones. There is provided a dispersion strengthened austenitic stainless steel article, including: 16-26 mass% of Cr; 8-22 mass% of Ni; 0.005-0.08 mass% of C; 0.002-0.1 mass% of N; 0.02-0.4 mass% of 0; at least one of 0.2-2.8 mass% of Zr, 0.4-5 mass% of Ta, and 0.2-2.6 mass% of Ti; and a balance consisting of Fe and inevitable impurities. The Zr, Ta and Ti components form inclusion particles in the stainless steel article by combining with the C, N and 0 components. The stainless steel article has an average grain size of 1 µm or less and a maximum grain size of 5 µm or less.