Inconel® alloy X750

UNS N07750
W.Nr 2.4669

Applications

Springs operating from cryogenic temperatures up to 1300°F (704°C), fasteners and components requiring resistance to high temperature and corrosive environments.

Description

Inconel® X750 is a precipitation hardenable Nickel-Chromium alloy with high strength at temperatures up to 1300°F (704°C) and oxidation resistance up to 1800°F (982°C). Inconel® X750 offers excellent resistance to relaxation and as a result it is widely used for springs operating at elevated temperatures.

Industries Supplied

Oil & Gas Extraction and Processing, Nuclear, Aerospace, Power Generation and Automotive

Nominal Composition

Ni: 70.0 min
Cr: 14.0 - 17.0
Fe: 5.0 - 9.0
Titanium: 2.25 - 2.75
Aluminium: 0.40 - 1.0
Cb(Nb): 0.70 - 1.20
Manganese: 1.0 min
Silicon: 0.50 max
Carbon: 0.08 max
Sulfur: 0.01 max
Copper : 0.5 max

Physical Properties

Density: 0.299 lb/in3, (8.28 g/cm3)

Modulus of Elasticity (E): 
At 70°F (20°C): 31.0 x 106 psi (214 GPa)
At 1000°F(538°C): 26.7x10psi (184 Gpa)

Modulus of Rigidity (G): 
At 70°F(20°C): 12.0x106 psi (82.7 Gpa)

Coefficient of Expansion:
7.8 µin/in.-°F (70°F to 1000°F)
14.5 µm/m-°C (20°C to 538°C)

Electrical Resistivity: 20.1 µΩ.in, (122 µΩ.cm)

Thermal Conductivity: 83 Btu-in/ft2hr-°F, (12.0 W/m-K)

Applicable Specifications

Wire & Bar: AMS 5698, AMS 5699, AMS 5778, NACE MR0175 (ISO 15156-3), ASTM B637, AMS 5667, AMS 5668, AMS 5670

Typical Mechanical Properties – Spring Applications

  • Annealed
    • Heat Treatment: 2000 – 2200°F; (1093 – 1204°C)
    • Tensile Strength: 130 ksi max; (896 MPa) max
  • No.1 Temper
    • Heat Treatment: As supplied condition.
    • Tensile Strength: 130 – 165 ksi; (896 – 1138 MPa)
  • No.1 Temper + Aged
    • Heat Treatment: After spring coiling. Age: 1350°F (732°C) for 16 hours.
    • Tensile Strength:165 – 220 ksi; (1138 – 1517 MPa)
    • Suggested operating conditions: Optimum resistance to relaxation at temperatures up to 1000°F (538°C) with moderate or low stresses.
  • Spring Temper
    • Heat Treatment: As supplied condition.
    • Tensile Strength: 160 – 220 ksi; (1103 – 1517 MPa)
  • Spring Temper + Aged
    • Heat Treatment: After spring coiling. Age: 1200°F (649°C) for 4 hours.
    • Tensile Strength: 180 – 250 ksi; (1241 – 1793 MPa)
    • Suggested operating conditions: Optimum stress and low relaxation at temperatures up to 700°F (371°C)
  • Spring Temper + Solution + Aged(3 Step Heat treatment)
    • Heat Treatment: After spring coiling. Solution Heat Treat: 2100°F (1149°C) for 2 hours and air cool. Age Harden at 1550°F (843°C) for 24 hours and air cool. Reheat to 1300°F (704°C) for 20 hours and air cool.
    • Tensile Strength: 145 - 190 ksi; (1000 – 1310 MPa)
    • Suggested operating conditions: Optimum resistance to relaxation at temperatures in the range 1000 – 1300°F (538 – 704°C).

INCONEL® is a registered trademark of the Special Metals Corporation group of companies.

For further information Contact:

Email: WIRE@ELGILOY.COM
Phone: 1 847 695 1900 
Elgiloy Specialty Metals - Wire Products
356 N.Cross Street
Sycamore, IL 60178 USA