Alloy 242 is a nickel-molybdenum-chromium age hardenable alloy which derives strength from a log-range ordering reaction upon aging. It has tensile and creep strength properties up to 1300°F which are as much as double for solid solution strengthened alloys, but with high ductility in the aged condition. The thermal expansion characteristics of alloy 242 are much lower than those for most other alloys, and it has very good oxidation resistance up to 1500°F.