HAYNES® 242® 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.
Oxidation Resistance - Excellent to 1400°F (760°C)
Gaseous Fluorine & HF - Excellent to 1650°F (900°C)
Molten Chloride/Fluoride Salts - Excellent to 1650°F (900°C)
Chloride Stress Cracking Resistance - Excellent
Chlorination - Excellent in Reducing Environments
Hydrogen Embrittlement Resistance - Fair to Good