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Inconel® X750 Foil/Sheet
Available Configurations
Properties common to all products in this list
| Thickness | Size | Temper ⓘ | Other Variant |
|---|---|---|---|
| 0.028 mm to 1 mm | 10 x 10 mm to 300 x 300 mm | As rolled Annealed |
Light Tight (Pinhole Free) |
Need custom configurations? Please contact us.
Key Features
Inconel® X750 Foil (Ni 74/Cr 15/Fe 7/Ti/Al/Nb, UNS N07750) is a precipitation-hardened nickel-chromium superalloy in thin flat sheet form, available in As Rolled and Annealed tempers:
Strength and Creep Resistance from γ′ Phase Precipitation
γ′ phase precipitation driven by titanium and aluminum additions provides the strength and creep resistance that distinguish X750 from solid-solution alloys such as 600 and 625, making X750 the selection wherever a thin component must maintain pre-stress or spring force under sustained high-temperature load.
Tensile Strength 700–1,250 MPa, Elastic Modulus 210 GPa
The tensile strength and 210 GPa modulus support precision shim, sealing strip, and spring-loaded closure applications where both load-bearing capacity and spring stiffness must be maintained across the service temperature range.
As Rolled Temper: Spring-Back and Strength for Precision Shims and Sealing Strip
The As Rolled temper provides spring-back and strength for precision shims and sealing strip where age hardening after forming is not required to meet the design specification.
Annealed Temper: Maximum Ductility Before Age Hardening
The Annealed temper maximizes ductility for forming before age hardening to final properties, ensuring consistent forming behavior and reproducible response to the subsequent precipitation heat treatment.
Non-Magnetic: Curie Temperature −193 °C
Non-magnetic character with a Curie temperature of −193 °C qualifies X750 foil for precision shims in cryogenic systems and spring-loaded closures in nuclear and gas turbine assemblies where magnetic permeability is a constraint.
Industrial Applications
Inconel® X750 Foil is used across aerospace, gas turbine, cryogenic, and nuclear industries wherever thin sheet must maintain pre-stress or spring force under sustained high-temperature load:
- ✦ Precision Turbine Sealing Strips
- Used for precision turbine sealing strips, where γ′-strengthened creep resistance maintains sealing force under sustained turbine operating temperatures and the As Rolled temper’s spring-back supports directly formed sealing geometries.
- ✦ Heat Shield Liners in Aerospace Hot Sections
- Applied as heat shield liners in aerospace hot sections, where the combination of high tensile strength, 700 °C service temperature, and excellent stress relaxation resistance supports maintained barrier geometry under sustained thermal loading.
- ✦ Precision Shims in Cryogenic Systems
- Used as precision shims in cryogenic systems, where non-magnetic character confirmed to −193 °C Curie temperature and good cryogenic mechanical performance qualify X750 where electromagnetically sensitive and thermally demanding service conditions coexist.
- ✦ Spring-Loaded Closure Elements in Gas Turbine and Nuclear Assemblies to ~700 °C
- Applied as spring-loaded closure elements in gas turbine and nuclear assemblies operating to approximately 700 °C, where retained spring force under sustained loading distinguishes X750 from conventional spring steels and solid-solution superalloy foils.
- ✦ High-Temperature Fatigue, Stress Relaxation and γ′ Precipitation Research
- Used for high-temperature fatigue and stress relaxation studies, fretting wear characterization in gas foil bearing applications, and investigations of γ′ precipitation kinetics and its influence on spring and creep properties in the Ni-Cr-Ti-Al system.
Material Properties
| Element | Value |
|---|---|
| Hardness - Brinell | 150-280 |
| Elongation at break( % ) | 20 |
| Modulus of elasticity( GPa ) | 210 |
| Shear strength( MPa ) | 118-152 |
| Tensile strength( MPa ) | 700-1250 |
| Element | Value |
|---|---|
| Initial permeability | 1.002 |
| Curie temperature( C ) | -193 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 122-124 |
| Element | Value |
|---|---|
| Melting point( C ) | 1390-1425 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 431@23°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 12@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 12.6@20-100°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 8.25 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |