Alloy x750: Superior Performance at elevated temperatures


Often referred to as Inconel Alloy® X-750, this high-performance austenitic nickel-chromium alloy is made precipitation-hardenable by the addition of aluminum and titanium. It has good resistance to corrosion and oxidation along with high tensile and creep-rupture properties at high temperatures. For extended applications that require high strength at high temperatures, Alloy X-750 may require a solution treatment, with air cooling between intermediate and final aging.

x750 profiled wire-1

Alloy X-750 displays excellent workability, including machinability and welding.  Alloy X-750 has excellent relaxation resistance, good elevated temperature strength properties to 1300ºF (700°C), and oxidation resistance to 1800ºF (983˚C). Lastly, Alloy X-750 is resistant to a wide variety of industrial corrosives under both oxidizing and reducing conditions, while also displaying excellent resistance to chloride stress corrosion cracking in fully age-hardened conditions.

Chemical Composition

Al: 0.40-1.0%, Cb: 0.70-1.20%, Cr: 14.0-17.0%, Fe: 5.0-9.0%, Ni: 70% min and Ti: 2.25-2.75%

Qualifying Specifications and Standards

Standard Designation
AMS 5667, 5671, 5698 (No 1 Spring Temper), 5699 (Spring Temper)
ISO 15156-3 (NACE MR 0175)
EN / W.NR 2.4669
UNS N07750
AWS 014

Heat Treatability Standards

Form Standards

ASTM B 637, ASME SB 637, ISO 9723, ISO9724, ISO9725, AMS 5667, AMS 5668, AMS 5669, AMS 5670, AMS 5671, AMS 5747, EN10269


ASTM B 637, ASME SB 637, ISO 9723, ISO9724, ISO9725, AMS 5667, AMS 5668, AMS 5669, AMS 5670, AMS 5671, AMS 5747, EN10269

Wire BS HR 505, AMS 5698, AMS 5699


With Alloy X-750's excellent relaxation resistance it is useful for applications such as high-temperature springs and bolts. Alloy X-750 is commonly used in:

  • Gas Turbines
    • Thrust Reversers
    • Wheels
    • Ducts
    • Discs
  • Aircraft Structures
  • Rocket Engines
  • Nuclear Reactors
  • Heat Treat Fixtures
  • Cryogenic Vessels
  • Cryogenic Springs
  • Cryogenic Fasteners
  • Exhaust Valves
  • Industrial Pressure Vessels
  • Tooling

Availability & Forms

Alloy X-750 is a stocked product at Central Wire Industries. Lead times vary based on processing required to finished form, but raw material is available at many Central Wire locations. Central Wire makes Alloy X-750 available in the following forms:

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