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Inconel® X750 Disk
Available Configurations
Properties common to all products in this list
| Thickness | Diameter | Temper ⓘ |
|---|---|---|
| 0.028 mm to 0.25 mm | 4 mm to 50.8 mm | As rolled Annealed |
Need custom configurations? Please contact us.
Health hazard/Hazardous to the ozone layer
Serious health hazard
Key Features
Inconel® X750 Disk (Ni 74/Cr 15/Fe 7/Ti/Al/Nb, UNS N07750) is a precipitation-hardened nickel-chromium superalloy in precision circular geometry, available in As Rolled and Annealed tempers:
Exceptional Stress Relaxation Resistance at Elevated Temperatures
X750 disk stock is selected over both solid-solution Inconel alloys and 718 wherever a disk component must retain spring force or geometric stability under sustained elevated temperature loading, a requirement that disqualifies conventional spring steels and less creep-resistant superalloys.
Tensile Strength 700–1,250 MPa, Elastic Modulus 210 GPa
The tensile strength and modulus combination supports precision spring disk, retaining ring, and sealing disk designs where both load-bearing capacity and stiffness must be maintained to design specification across the service temperature range.
Non-Magnetic: Curie Temperature −193 °C
The Curie temperature of −193 °C confirms non-magnetic behavior from cryogenic to elevated service temperatures, qualifying X750 disk for nuclear reactor assemblies and aerospace components where magnetic permeability is a design constraint.
As Rolled Temper: Strength and Surface Quality for Direct Use
The As Rolled condition provides strength and surface quality for directly used disk components where further heat treatment is not required.
Annealed Temper: Maximum Ductility for Forming and Machining Before Age Hardening
The Annealed condition delivers maximum ductility for forming and machining before subsequent age hardening to peak γ′-strengthened properties.
Good Cryogenic Performance
Good cryogenic performance distinguishes X750 from 718 in disk applications requiring retained mechanical properties and spring force from cryogenic through to approximately 700 °C, covering the widest service temperature range of any precipitation-hardened Inconel disk grade.
Industrial Applications
Inconel® X750 Disk is used across aerospace, nuclear, and gas turbine industries wherever disk components must retain spring force or geometric stability under sustained elevated temperature loading:
- ✦ Precision-Machined Turbine Retaining Ring Blanks
- Used as blanks for precision-machined turbine retaining rings, where exceptional stress relaxation resistance and the 210 GPa modulus support maintained clamping force and dimensional stability under sustained turbine operating temperatures.
- ✦ Spring Disk Elements in High-Temperature Fastening Systems
- Applied as spring disk elements in high-temperature fastening systems, where X750’s γ′-strengthened microstructure maintains spring force under load at temperatures where conventional spring steels would relax unacceptably.
- ✦ Sealing Disk Components in Nuclear Reactor Assemblies
- Used as sealing disk components in nuclear reactor assemblies, where non-magnetic character confirmed to −193 °C Curie temperature and good cryogenic performance together meet the combined electromagnetic and mechanical requirements of nuclear sealing applications.
- ✦ Structural Circular Elements in Aerospace Components from Cryogenic to ~700 °C
- Applied as structural circular elements in aerospace components operating between cryogenic and approximately 700 °C, where the widest service temperature range of any precipitation-hardened Inconel disk grade and non-magnetic character support demanding aerospace structural requirements.
- ✦ Fatigue, Creep, Stress Relaxation and γ′ Phase Research Specimens
- Used as specimens for high-temperature fatigue and creep characterization, stress relaxation measurement in precipitation-hardened superalloy disk geometry, fretting wear evaluation, and studies of γ′ phase formation, coarsening kinetics, and its influence on elastic modulus and creep properties.
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% |
| Diameter | ±0.5mm |