A nickel-chromium precipitation-hardenable grade, Alloy X-750 has high tensile and creep-rupture properties.

Similar to Alloy 600, Alloy X-750 has additional aluminium and titanium to increase the mechanical properties at temperatures up to 704°C.

  • UNS Number: N07750
  • Werkstoff Number: 2.4669
  • ASTM: B637, 5598, 5670, 5671, 5247
  • AMS: 5542

Product availability

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Chemical analysis



  • Rocket engines
  • Gas turbine engines
  • Nuclear reactors
  • Nuclear valves
  • Pressure vessels
  • Tooling
  • Aircraft structure

About Alloy X-750

Alloy X-750 has good mechanical properties at high temperatures up to 704°C. The alloy was developed from Alloy 600 by adding aluminium and titanium to make the alloy precipitation hardenable. Alloy X-750 also demonstrates good formability and excellent high-temperature oxidation resistance.

Alloy X-750 offers outstanding performance in highly stressed environments, which is why it’s often used in gas turbines, nuclear reactors and aircraft structures.

For more information on Alloy X-750, including details of our inventory contact us, or fill in our online quote form and we’ll get right back to you!

  • Density: 8.276 g/cm³
  • Melting range: 1393-1427°C
  • Poisson's ratio: 0.3
  • Electrical resistivity: 1.22 x 10<sup>-6</sup> Ω⋅m
  • Corrosion resistance: 15.05-18.8 , PREN = %Cr + 1.5(%Mo + %W + %Nb)

Mechanical & Physical Properties

Mechanical & Physical Properties20°C200°C400°C427°C538°C600°C649°C732°C816°C
Ultimate Tensile Strength /MPa1503.11351.4744.6688.8-622.6593-600
0.2% Yield Strength /MPa979.1737.7365.4340.6-278.5250.3-253.7
Elongation %36494747-4647-48
Charpy Impact V-notch /J436.6115.2189.8------
Coefficient of Thermal Expansion µm/m⁰C---14.2214.9415.1215.4815.6615.84
Thermal Conductivity /kcal/(hr.m.°C)--1011.212.112.91515.6615.84
Modulus of Elasticity / x105 MPa--1.951.89-1.81.71-1.61
Proud members of the British Valve & Actuator AssociationProud members of the British Valve & Actuator Association