Hastelloy X, also known as “Alloy X”, is designated as UNS N06002 or W.Nr 2.4665. It is a nickel-chromium-iron-molybdenum alloy that possesses an exceptional combination of oxidation resistance, fabricability, and high-temperature strength. Hastelloy X has also been found to be exceptionally resistant to stress-corrosion cracking in petrochemical applications and resistant to carburization and nitriding. This Alloy X exhibits good ductility after prolonged exposure at temperatures of 650°C[1200°F], 760[1400°F] and 870°C[1600°F] for a period of 16000 hours. Hastelloy X are widely used in gas turbines, petrochemical and nuclear industries, furnaces, pressure equipment, and aircraft components.

1. Chemical Composition Requirements of Hastelloy X

The Chemical Composition of Hastelloy X, %
Ni	balance
Cr	20.5-23.0
Fe	17.0-20.0
Mo	8.0-10.0
Co	0.5-2.5
W	0.20-1.00
C	0.05-0.15
Mn	≤1.00
Si	≤1.00
P	≤0.040
S	≤0.030

2. Typical Physical Properties

Density	Melting Range	Specific Heat	Thermal Conductivity	Electrical Resistivity
g/cm3	°C	J/kg.k	W/m.k	µΩ·m
8.22	1260-1355	486	9.1	1180

3. Product Forms and Standards

Product Form	Standard
Rod	ASTM B572
Plate, sheet and strip	ASTM B435, B906
Seamless pipe and tube	ASTM B622
Welded pipe	ASTM B619, B775
Welded tube	ASTM B626, B751
Welding fitting	ASTM B366
Billet and bar for reforging	ASTM B472

*The mechanical properties of Hastelloy X materials vary according to different forms and heat treatment conditions.

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