Hastelloy X™ Alloy

General Characteristics of Hastelloy X™ Alloy

This is a nickel-chromium-iron-molybdenum alloy with an exceptional combination of resistance to oxidation and high-temperature strength. It can also be easily fabricated, and exhibits good ductility after prolonged exposure to temperatures as high as 1600ºF (870ºC) for 16,000 hours.

Chemical Analysis
C Carbon
Mn Manganese
1.00 max
Si Silicon
1.00 max
Cr Chromium
Mo Molybdenum
Co Cobalt
Fe Iron
B Boron
0.006 max
N Nickel
47 (bal)


The alloy finds extensive use in gas-turbine engines for combustion-zone components such as transition ducts, combustor cans, spray bars and flame holders. It is also used in industrial furnace applications, and in the chemical process industry for retorts, muffles and furnace baffles.


The alloy may be forged between 2225ºF (1215ºC) and 1550ºF (840ºC).

Heat treatment

The alloy is normally supplied in the solution-treated condition, following a treatment at 2150ºF (1175ºC) and rapid cooling. Bright annealed parts are cooled in hydrogen.

Aging of this material is normally performed at temperatures of 1200, 1400, 1600ºF (650, 760, 870ºC).


The alloy’s machinability rating is 27% that of B1112 screw stock. Slow speeds, positive feeds and rigid equipment are the order of the day.


The alloy may be welded using shielded-metal-arc, gas-tungsten-arc, gas-metal-arc or resistance methods.

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