TWI752854B

An austenitic stainless steel consists of 0.010 to 0.200% by mass of C, 2.00% by mass or less of Si, 3.00% by mass or less of Mn, 0.035% by mass or less of P, 0.0300% by mass or less of S, 6.00 to 14.00% by mass of Ni, 20.0 to 26.0% by mass of Cr, 3.00% by mass or less of Mo, 0.01 to 3.00% by mass of Cu, 1.000% by mass of less of Ti, 0.200% by mass or less of Al, 0.1000% by mass or less of Ca, 0.100 to 0.250% by mass of N, and 0.0080% by mass or less of O, the balance being Fe and impurities, wherein the austenitic stainless steel has an E value represented by the following equation (1) of -17.0 or more, and an F value represented by the following equation (2) of 0 or more: E=−0.33×SFE+0.25×R in which SFE is 25.7 + 2Ni + 410C - 0.9Cr - 77N - 13Si - 1.2Mn where each symbol of the elements represents a content (% by mass) of each element, and R is an average crystal grain size (µm); and F=1003O−211Al−158Ca−79Ti in which each symbol of the elements represents a content (% by mass) of each element.