A nickel-base cast alloy is provided having high retention of ductility and high thermal stability on aging coupled with low thermal expansion and good oxidation resistance. Such alloy has a composition in weight percent within the range molybdenum 13.7 to 15.5%, chromium 14.7 to 16.5%, carbon 0.02% max., boron up to 0.02%, manganese 0.3 to 1.0%, silicon 0.2 to 0.75%, cobalt 2.0% max., iron 3.0% max., tungsten 1.0% max., aluminum 0.1 to 0.5% and the balance nickel, said alloy having an Nv number between 2.23 and 2.31.
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