Hastelloy X
Overview
Hastelloy X is a wrought nickel-chromium-iron-molybdenum superalloy developed for extreme high-temperature environments. First commercialized in the 1950s by Haynes International, it remains a benchmark material for applications requiring both oxidation resistance and mechanical strength above 800°C (1470°F). The alloy's balanced composition (approximately 47% Ni, 22% Cr, 18% Fe, and 9% Mo) provides unique performance in reducing and oxidizing atmospheres. It is particularly valued in aerospace propulsion systems where thermal cycling resistance is critical.
Physical and Chemical Properties
Hastelloy X demonstrates exceptional stability across a wide temperature range, maintaining tensile strength up to 980°C (1800°F). Its chromium content forms a protective oxide layer, while molybdenum enhances resistance to reducing acids. The alloy shows low thermal expansion (14.7 μm/m·°C at 20-1000°C) and good thermal conductivity (11.1 W/m·K at 100°C). Notably, it retains approximately 70% of its room-temperature yield strength at 870°C (1600°F). The material is non-magnetic below its Curie point and exhibits excellent resistance to stress-corrosion cracking in chloride environments.
Main Applications
Primary applications focus on high-temperature structural components. In aerospace, it's used for combustion chambers, afterburner components, and turbine seals in jet engines (e.g., GE CF6, PW4000 series). Industrial applications include radiant tubes, muffles, and retorts in heat treatment furnaces operating up to 1200°C (2200°F). The chemical processing industry utilizes Hastelloy X for pyrolysis reactor parts and flare stacks due to its resistance to sulfidation. Emerging applications include components for advanced nuclear reactors and concentrated solar power systems where creep resistance is paramount.
Safety and Storage
While generally safe in solid form, machining operations generate dust requiring NIOSH-approved respirators. The alloy contains approximately 0.5-2.5% cobalt, necessitating proper handling to minimize inhalation exposure. No special storage requirements exist beyond standard metal inventory practices—keep dry and separate from corrosive chemicals. During welding, adequate ventilation is essential as chromium compounds may form. Post-weld heat treatment (1120°C for 30 min, air cool) is recommended for critical applications to restore corrosion resistance in heat-affected zones.
B2B Procurement Guide
When sourcing Hastelloy X, specify the required product form (plate, bar, wire) and relevant standards. Aerospace buyers should require AMS 5536 (sheet/strip) or AMS 5758 (forging) certifications. For industrial applications, ASTM B435 (plate/sheet) or B572 (bars) are common. Lead times can extend to 12-16 weeks for specialty forms. Consider stocking distributors for small quantities, but verify material traceability. Price fluctuations track nickel commodity markets—contracts with price adjustment clauses are advisable for large orders. Quality verification should include review of mill test reports for chemistry and mechanical properties.
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