HAYNES242 alloy is a unique, age-hardenable alloy that combines relatively low thermal expansion characteristics with outstanding strength, fatigue-resistance, and oxidation resistance for service temperatures as high as 1400°F (760°C). It is ideally suited to use in seal rings, containment rings, duct segments, casings, fasteners, rocket nozzles, pumps, and many other components. 242^® alloy has tensile and creep strength properties up to 1300°F (705°C). These properties are as much as double those of solid solution-strengthened alloys and are comparable to those of some precipitation-hardened super alloys.

242 alloy has excellent tensile ductility over the entire temperature range and superior, low-cycle fatigue strength. It is also readily formed and welded by conventional techniques. Although 242^® alloy contains only 8% chromium, its oxidation resistance is sufficient to allow its use in an uncoated condition at temperatures as high as 1500°F (815°C). This attribute gives this alloy a real advantage over other low-expansion alloys.

Haynes alloy 242 is furnished in the annealed condition, unless otherwise specified. The alloy is usually annealed in the range of 1900-2050°F (925-1120°C),depending upon specific requirements, followed by an air cool (or more rapid cooling) before aging. A water quench is recommended for heavy section components..
Aging is performed at 1200°F (650°C) for a period of 24 hours, followed by an air cool.