19-03-2020 дата публикации
Номер: US20200087759A1
An austenitic alloy material is provided that includes a base metal having a surface, and a film containing chromium oxide having a thickness of 0.1 to 50 μm on at least one portion of the surface. A chemical composition at a depth position in the film at which the Cr concentration is highest contains, by atom %, 50% or more of Cr as a proportion occupied among components excluding O, C and N. The chemical composition of the base metal consists of, by mass %, C: 0.001 to 0.6%, Si: 0.01 to 5.0%, Mn: 0.1 to 10.0%, P: 0.08% or less, S: 0.05% or less, Cr: 15.0 to 55.0%, Ni: 30.0 to 80.0%, N: 0.001 to 0.25%, O: 0.02% or less, Mo: 0 to 20.0%, Cu: 0 to 5.0%, Co: 0 to 5.0%, W: 0 to 10.0%, Ta: 0 to 6.0%, Nb: 0 to 5.0%, Ti: 0 to 1.0%, B: 0 to 0.1%, Zr: 0 to 0.1%, Hf: 0 to 0.1%, Al: 0 to 1.0%, Mg: 0 to 0.1%, and Ca: 0 to 0.1%, the balance being Fe and impurities. 1. An austenitic alloy material comprising a base metal having a surface , and a film containing chromium oxide having a thickness of 0.1 to 50 μm on at least one portion of the surface , wherein:a chemical composition at a depth position in the film at which a Cr concentration is highest contains, by atom %, 50% or more of Cr as a proportion occupied among components excluding O, C and N; anda chemical composition of the base metal consists of, by mass %:C: 0.001 to 0.6%,Si: 0.01 to 5.0%,Mn: 0.1 to 10.0%,P: 0.08% or less,S: 0.05% or less,Cr: 15.0 to 55.0%,Ni: 30.0 to 80.0%,N: 0.001 to 0.25%,O: 0.02% or less,Mo: 0 to 20.0%,Cu: 0 to 5.0%,Co: 0 to 5.0%,W: 0 to 10.0%,Ta: 0 to 6.0%,Nb: 0 to 5.0%,Ti: 0 to 1.0%,B: 0 to 0.1%,Zr: 0 to 0.1%,Hf: 0 to 0.1%,Al: 0 to 1.0%,Mg: 0 to 0.1%,Ca: 0 to 0.1%, andthe balance: Fe and impurities.2. The austenitic alloy material according to claim 1 , wherein the chemical composition of the base metal contains claim 1 , by mass % claim 1 , one or more elements selected from:Mo: 0.01 to 20.0%,Cu: 0.01 to 5.0%,Co: 0.01 to 5.0%,W: 0.01 to 10.0%,Ta: 0.01 to 6.0%,Nb: 0.01 to 5.0%,Ti: 0.01 to 1.0%,B ...
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