Hastelloy X

Hastelloy X is a nickel-chromium-iron-molybdenum superalloy with outstanding high temperature strength, oxidation resistance, and fabricability. Alloy X’s oxidation resistance is excellent up to 2200° F. This nickel steel alloy has also been found to be exceptionally resistant to stress-corrosion cracking in petrochemical applications. Matrix stiffening provided by the molybdenum content results in high strength in a solid-solution alloy having good fabrication characteristics.

The high nickel and molybdenum contents make the nickel steel alloy especially resistant to pitting and crevice corrosion in reducing environments while chromium conveys resistance to oxidizing media. The low carbon content minimizes carbide precipitation during welding to maintain corrosion resistance in as-welded structures.

• Sheet
• Plate
• Bar

What are the characteristics of Hastelloy X?

• Outstanding oxidation resistance through 2000° F
• Resistant to carburization and nitriding
• Excellent high temperature strength
• Good resistance to chloride stress-corrosion cracking

Chemical Composition, %

Ni	Mo	Cr	Fe	W	Co	Mn	C
Remainder	8.0-10.0	20.5-23.0	17.0-20.0	.2-1.0	.5-2.5	1.0 max	.05-.15
P	S	Si	Al	Ti	B	Cu
.04 max	.03 max	1.0 max	.50 max	.15 max	.01 max	.50 max

ASTM Specifications

Sheet/Plate	Bar
B435	B572

Mechanical Properties

Representative Tensile Properties, sheet

Temp° F	Tensile (psi)	.2% Yield (psi)	Elongation in 2” %
70	110,600	54,900	44
1000	89,000	35,600	49
1200	83,000	35,400	54
1400	67,000	34,400	53
1600	45,000	28,200	58