Alloy X - UNS N06002

Alloy X, UNS N06002, is commonly associated with ASME SB435 - ASME SB572 - AMS 5536 - AMS 5754.
Alloy X is commonly known as HX and Hast X, short for Hastelloy® X, as well as Pyromet 680. Alloy X is a Nickel-Chrome-Moly-Iron alloy.
Mechanical properties here.


Ni Cr Mo Co W Al Ti B C Fe Mn Si P S Cu
Max % Bal 23.0 10.0 2.5 1.0 0.5 0.15 0.01 0.15 20.0 1.0 1.0 0.04 0.03 0.5
Min % 20.5 8.0 0.5 0.2 0.05 17.0

Typical Inventory

Round Bar, Plate, Strip

Product Description

Alloy X, also called Hastelloy® X, is a nickel-chromium-iron-molybdum alloy with high strength and oxidation resistance to 2200 °F as well as good carburization and nitriding resistance. It has also been found to have good resistance to stress-corrosion cracking in some petrochemical applications. It has an ASME Boiler and Pressure Vessel code case.

Alloy X has excellent forming and welding characteristics, resistance to oxidizing, reducing, and neutral atmospheres. It exhibits good ductility after prolonged service temperatures of 1200 °F through 16,000 hours.

Alloy X is also suitable for internal structural components in industrial furnaces such as rolls, retorts, baffles, flash drier components, and muffles. It is a good choice for material for heat treating components such as trays and fixtures due to its excellent resistance to oxidizing atmospheres.

General Data

Alloy X is one of the most widely used nickel base superalloys for gas turbine engine components. This solid solution strengthened grade has good strength and excellent oxidation resistance to 2000°F. Alloy X has excellent resistance to reducing and carburizing atmospheres making it suitable for furnace components. Due to its high molybdenum content, Alloy X may be subject to catastrophic oxidation at 2200°F.

  • Good high temperature strength.
  • Oxidation resistance through 2000°F.
  • Carburization resistant.


Alloy X is recommended especially for use in furnace applications because it has unusual resistance to oxidizing, reducing, and neutral atmospheres. Furnace rolls made of this alloy were still in good condition after operating for 8700 hours at 2150 °F. Furnace trays, used to support heavy loads, have been exposed to temperatures up to 2300 °F. in an oxidizing atmosphere without bending or warping. Alloy X is also used for retorts, muffles, catalyst support grids, furnace baffles, tubing for pyrolysis operations and flash drier components.

Alloy X has wide use in gas turbine engines for combustion zone components such as transition duct, combustor cans, spray bars, and flame holders, as well as in afterburners, tailpipes, and cabin heaters.

Mechanical Properties

The typical properties listed can usually be provided in rounds, sheet, strip, plate, & custom forgings. We have the equipment to produce small quantities in special sizes to meet our customers’ specific needs.

Density: 0.297 lb/in3
Melting Range: 2300-2470°F
Temperature, °F Coefficient* of Thermal Expansion, in/in°F x 10-6 Thermal Conductivity, Btu by ft/ft2 by hr by °F Modulus of Elasticity Dynamic, psi x 106
70* 30
1000 8.4 11.3 26
1200 8.6 12.7 25
1400 8.8 13.9 23
1600 9.0 15.2 22
1800 9.2 16.4 20

* 70°F to indicated temperature.

Common Specifications

Please, note that the specs listed are for reference and are not comprehensive nor indicative of the actual specifications listed on the Material Test Report (MTR). If you have a special spec requirement, then please reach out to our sales department at 1-800-472-5569.

Form Standard
Metal Type UNS N06002
Bar AMS 5754
Sheet AMS 5536, ASME SB435, GE B50A436, GE B50T83, GE B50TF24, PDS 15102QFC
Plate ASME SB-435
Forging AMS 5754
Weld Wire AMS 5798
Weld Electrode


Nickel and cobalt based alloys can be difficult to machinine. However, it should be emphasized that these alloys can be machined using conventional production methods at satisfactory rates. These alloys harden rapidly, generate high heat during cutting, weld to the cutting tool surface and offer high resistance to metal removal because of their high shear strengths. The following are key points which should be considered during machining operations:

  • CAPACITY - Machine should be rigid and overpowered as much as possible.
  • RIGIDITY - Work piece and tool should be held rigid. Minimize tool overhang.
  • TOOL SHARPNESS - Make sure tools are sharp at all times. Change to sharpened tools at regular intervals rather than out of necessity. A 0.015 inch wear land is considered a dull tool.
  • TOOLS - Use positive rake angle tools for most machining operations. Negative rake angle tools can be considered for intermittent cuts and heavy stock removal. Carbide-tipped tools are suggested for most applications. High speed tools can be used, with lower production rates, and are often recommended for intermittent cuts.
  • POSITIVE CUTS - Use heavy, constant, feeds to maintain positive cutting action. If feed slows and the tool dwells in the cut, work hardening occurs, tool life deteriorates and close tolerances are impossible.
  • LUBRICATION - lubricants are desirable. Soluble oils are recommended especially when using carbide tooling.

Data Sheet

Download our datasheet here

Ulbrich's information on alloy X

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