Appeal No. 2005-1354
Application No. 09/940,481
and further comprising iron and impurities resulting from
smelting; the chemical composition of the alloy furthermore
satisfying the relationships:
Co + Ni #38.5%
Co + 0.5 x Ni $20%
Co + 5 x Ni $165.5%
and
S #0.02 x Mn + 0.08 x Ca + 0.6 x Mg
wherein said alloy has a martensitic transformation start
point of less than -50°C, an average coefficient of thermal
expansion between 20° and 100°C of less than or equal to 0.7 x
10-6/°K and a mean coefficient of thermal expansion between 80°
and 130°C of less than or equal to 1 x 10-6/°K.
9. An Fe-Ni-Co alloy consisting essentially of iron and:
32% #Ni #34%
3.5% #Co #6.5%
0% #Mn #0.1%
0% #Si #0.1%
0% #Cr #0.1%
0.005% #C #0.02%
S #0.001%
0.0001% #Ca #0.002%
0.0001% #Mg #0.002%
the chemical composition of the alloy furthermore satisfying
the relationships:
Co + Ni # 38.5%
Co + 0.5 x Ni $20%
Co + 5 x Ni $165.5%
wherein % is % by weight, and
S #0.02 x Mn + 0.08 x Ca + 0.6 x Mg
wherein said alloy has a martensitic transformation start
point of less than -186°C and an average coefficient of thermal
expansion between 20° and 100°C of from 0.7 x 10-6/K to 0.49 x
10-6/K.
-2-
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