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US 9,752,468 B2Granted
Low-cost, high-strength Fe—Ni—Cr alloys for high temperature exhaust valve applications
OwnerGovindarajan Muralidharaninventor
Life of this patent
Estimating the term…
Abstract
An Fe—Ni—Cr alloy is composed essentially of, in terms of wt. %: 2.4 to 3.7 Al, up to 1.05 Co, 14.8 to 15.9 Cr, 25 to 36 Fe, up to 1.2 Hf, up to 4 Mn, up to 0.6 Mo, up to 2.2 Nb, up to 1.05 Ta, 1.9 to 3.6 Ti, up to 0.08 W, up to 0.03 Zr, 0.18 to 0.27 C, up to 0.0015 N, balance Ni, wherein, in terms of atomic percent: 8.5≦Al+Ti+Zr+Hf+Ta≦11.5, 0.53≦Al÷(Al+Ti+Zr+Hf+Ta)≦0.65, and 0.16≦Cr÷(Fe+Ni+Cr+Mn)≦0.21, the alloy being essentially free of Cu, Si, and V.
Claims20
An Fe—Ni—Cr alloy consisting essentially of, in terms of wt. %:
- Al 2.4 to 3.7
- Co up to 1.05
- Cr 14.8 to 15.9
- Fe 25 to 36
- Hf up to 1.2
- Mn up to 4
- Mo up to 0.6
- Nb up to 2.2
- Ta up to 1.05
- Ti 1.9 to 3.6
- W up to 0.08
- Zr up to 0.03
- C 0.18 to 0.27
- N up to 0.0015
- balance Ni,
- wherein, in terms of atomic percent:
- 8.5≦Al+Ti+Zr+Hf+Ta≦11.5,
- 0.53≦Al÷(Al+Ti+Zr+Hf+Ta)≦0.65, and
- 0.16≦Cr÷(Fe+Ni+Cr+Mn)≦0.21,
- said alloy being essentially free of Cu, Si, and V.
17 more elements
Dependencies are inferred from the claim text.