Austenitic heat resisting steel
AssigneeNippon Kokan Kabushiki Kaisha
InventorsTohru Mimino, Kazuhisa Kinoshita, Takayuki Shinoda, Isao Minegishi
Life of this patent
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Abstract
An austenitic heat resisting steel exhibiting excellent strength for a long period of time services at an elevated temperature, coexistant-adding 0.02 to 1.0% Nb and 0.02 to 1.9% Zr or 0.02 to 1.0% Nb, 0.02 to 1.0% Zr and 0.02 to 1.0% Ti in addition to usual composition of a stainless steel, simultaneously adjusting the atomic ratio of said(Nb+Zr) or (Nb+Zr+Ti) to C within the range of 0.05 to 1.0, preferably 0.2 to 0.5.
Claims2
An austenitic heat resisting steel exhibiting excellent strength for a long period of time services at an elevated temperature consisting of the following composition;
- C:
- 0.03 to 0.30%, Si:
- up to 1.00%, Mn:
- up to 2.00%, Cr:
- 15.0 to 26.0%, Ni:
- 7.0 to 22.0%. 0.02 to 1% of each of Nb(containing Ta) and Zr
- wherein
- the atomic ratio of (Nb+Zr) to C is within the range of 0.05 to 1.0, preferably 0.2 to 0.5 unavoidable impurities and the balance being Fe.
An austenitic heat resisting steel exhibiting excellent strength for a long period of time services at an elevated temperature consisting of the following composition:
- C:
- 0.03 to 0.30%, Si:
- up to 1.00%, Mn:
- up to 2.00%, Cr:
- 15.0 to 26.0%. Ni:
- 7.0 to 22.0% 0.02 to 1 % of each of Nb (containing Ta), Zr and Ti
- wherein
- the atomic ratio of (Nb+Zr+Ti) to C is within the range of 0.05 to 1.0, preferably, 0.2 to 0.5 unavoidable impurities and the balance being Fe.
Dependencies are inferred from the claim text.