| 摘要 |
An austenitic Fe-Ni-Cr alloy comprises C: 0.005~0.03 mass %, Si: 0.15~1.0 mass %, Mn: not more than 2.0 mass %, P: not more than 0.030 mass %, S: not more than 0.002 mass %, Cr: 18~28 mass %, Ni: 20~38 mass %, Mo: 0.10~3 mass %, Co: 0.05~2.0 mass %, Cu: less than 0.25 mass %, N: not more than 0.02 mass %, provided that PRE=Cr+3.3×Mo+16×N>=20.0 and PREH=411-13.2×Cr-5.8×Mo+0.1×Mo2+1.2×Cu@145.0 (wherein each element symbol represents a content (mass %) of each element) and has an excellent corrosion resistance in air or under a wet environment even at a surface state having an oxide film formed by a intermediate heat treatment on the way of the production process.
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