Austenitic heat-resistant alloy and its manufacturing method, and austenitic heat-resistant alloy material

摘要

Provided are an austenitic heat-resistant alloy capable of obtaining sufficient molten salt corrosion resistance even when exposed to a molten salt of 600°C, a method for producing the same, and an austenitic heat-resistant alloy material. The austenitic heat-resistant alloy of the present disclosure includes a base material and a Ni-Fe oxide having a spinel structure on the surface of the base material. The base material is mass%, C: 0.030 to 0.120%, Si: 0.02 to 1.00%, Mn: 0.10 to 2.00%, Cr: 20.0% or more and less than 28.0%, Ni: more than 35.0% and 50.0% or less, W: 4.0 to 10.0%, Ti: 0.01~0.30%, Nb: 0.01~1.00%, sol.Al: 0.0005~0.0400%, B: 0.0005~0.0100%, Mo: less than 0.5%, Co: 0~0.80%, Cu: 0~ 0.50%, and the balance has a chemical composition consisting of Fe and impurities.