Hastelloy X* Specification
*Trade name of Haynes International

  • W.NR 2.4665
  • UNS N06002
  • AWS 057

Applicable Standards:

  • AMS 5798
  • ASTM B619

Hastelloy X is a Nickel-Chromium-Iron-Molybdenum alloy with an exceptional combination of oxidation resistance, ease of fabrication and high temperature strength. It has also been found to be exceptionally resistant to stress corrosion cracking in petrochemical applications.

Good Mechanical Properties at Elevated Temperatures Yes
Corrosion Resistant at Ambient Temperatures No
Corrosion Resistant & Good Mechanical Properties at Elevated Temperatures No
Oxidation Resistant Yes
Precipitation Hardenable No

Applications include:

  • Gas turbine engine
  • Industrial furnace
  • Chemical processing
  • Petrochemical industry
Approximate Chemical Composition
Ni 47%
Cr 22%
Fe 18%
Mo 9%
Co 1.5%
Properties
DENSITY 8.22 g/cm3 0.297 lb/in3
MELTING POINT 1355oC 2470oF
COEFFICIENT OF EXPANSION 13.9 µm/m °C
(20 - 100°C)
7.7 x 10-6 in/in °F
(70 - 212°F)
MODULUS OF RIGIDITY 77.6 kN/mm2 11255 ksi
MODULUS OF ELASTICITY 205 kN/mm2 29733 ksi
CONDITION OF SUPPLY HEAT TREATMENT (AFTER FORMING)
Annealed/Spring Temper Stress relieve at 400 - 450oC (750 - 840oF) for 2 hours and air cool.
CONDITION APPROX TENSILE STRENGTH APPROX SERVICE TEMPERATURE
Annealed 850 - 1050 N/mm2 123 - 152 ksi -200 to +400oC -330 to +750oF
Spring Temper 1350 - 1550 N/mm2 196 - 225 ksi -200 to +400oC -330 to +750oF
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