Hastelloy ®X

Back To Alloys
UNS - N06002

Other common names: Alloy X, Inconel® HX

Hastelloy X is a nickel-chromium-iron-molybdenum super alloy. This alloy includes extraordinary elevated temperature strength, fabricability and oxidation resistance. Alloy X’s oxidation resistance is incredibly up to 2200° F. This nickel steel alloy has additionally been observed to be exceptionally resistant to stress-corrosion cracking in petrochemical applications.

Matrix stiffens provided by the molybdenum content results in high strength in a solid-solution alloy having good fabrication attributes. Despite the fact that this Hastelloy X nickel alloy is fundamentally noted for heat and oxidation resistance. It has good resistance to chloride stress-corrosion cracking, carburization and magnificent resistance to decreasing or carburizing atmospheres. Two normal conditions that frequently prompt early disappointment in elevated temperature alloys, carburization and nitriding, Hastelloy X resists.

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

  • Gas turbines
  • Petrochemical industry
  • Industrial furnaces
  • Heat treating equipment
  • Nuclear engineering
  • Jet engine combustion chambers
  • Aircraft cabin heaters
  • Turbine exhaust components

Alloy X is a standout amongst the most generally utilized nickel base super alloys for gas turbine engine combustion area parts such as transition ducts, combustor cans, spray bars and flame holders as well as in the afterburners, tailpipes and cabin heaters. It is recommended to utilize in industrial furnace applications since it has unusual resistance to oxidizing, decreasing and neutral atmospheres. Hastelloy X is additionally utilized in the chemical process industry for retorts, muffles, catalysts support grids, furnace baffles, tubing for pyrolysis operations and flash drier components.


The alloy is machinable by standard techniques and is related to the machining of the austenitic (300 series) stainless steels.


Alloy X has excellent forming and welding qualities. It can be forged and, because of its good ductility, can be cold worked. It can be welded by both manual as well as automatic techniques including shielded metal arc, gas tungsten arc, gas metal arc and submerged arc processes. The alloy can also be resistance welded. For hot forming, the alloy should be heated to a starting temperature of 2150° F (1175°C).


Cold working and shaping of the different product forms can be possible with standard tooling and processing.


Welding by standard processes, for example, resistance welding, shielded metal arc, and MIG or TIG should promptly be possible with this alloy. The coordinating filler metal should be utilized. Preheating and/or post heating are not required

Heat Treatment

The alloy is mostly supplied in the solution annealed condition. This is expert at 2150 F followed by a fast cooling.

Hot Working

Hot forging can be accomplished by standard practice.

Cold Working

Promptly cold worked in a way like that for austenitic (300 series) stainless steels with the exception of this alloy is somewhat "stiffer" and may require more forming pressure. After severe cold working the product can be solution annealed.


forging can be accomplished by standard practice.


The alloy can be aged, after solution heat treatment, at temperatures of 1200 to 1600 F. Aging will bring about a slight increase in strength and hardness with the impact being related to hours of presentation at the aging temperature - the more extended the time the greater impact.


Hardened are done by cold working and somewhat by aging. This alloy is not hardenable by standard heating a quenching as with plain carbon steels.

Chemical Composition %

0.05 - 0.151.0 max0.04 0.03 20.5 - 23.01.0 max17.0 - 20.00.5 - 2.5Remainder8.0 - 10.00.2 - 1.0

Mechanical Properties

Tensile Strength (ksi)0.2% Yield Strength (ksi)Elongation% in 2 inches

Physical Properties

UnitsTemperature in °C
Density8.22 g/cm³22 °C
Specific Heat0.116 Kcal/kg. Room
Melting Range1260 - 1355 °C-
Modulus of Elasticity 205 KN/mm²Room
Electrical Resistivity118.3 µΩ.cm22°
Coefficient of Expansion13.9 µm/m °C26 - 93°
Thermal Conductivity9.1 W/m -°K21°

ASTM Specifications

Pipe / Tube (SMLS)Pipe / Tube WeldedSheet / PlateBarForgingFitting
B 622B 619B 435 B 572 B 564 B 366


Custom Machining
Custom Fabrication
Piping / Spools
Stamped Parts
B/W Fittings
S/W Fittings
Compression Fittings
Raw Materials
Pipes & Tubes
Sheets & Plates
Get To Quote
Please Contact Us