Inconel Alloys
Inconel X-750 (UNS N07750) — Composition, Properties & Supply
Inconel X-750 (UNS N07750) is a Ni-Cr alloy precipitation hardened by γ′ through titanium, aluminium and niobium. It retains high strength and relaxation resistance below 700 °C and is a classic choice for high-temperature springs, turbine blades and nuclear reactor internals.
What is the chemical composition of Inconel X-750?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ni | Ni | ≥ 70.0 |
| Cr | Cr | 14.0–17.0 |
| Fe | Fe | 5.0–9.0 |
| Ti | Ti | 2.25–2.75 |
| Al | Al | 0.40–1.00 |
| Nb+Ta | Nb+Ta | 0.70–1.20 |
| Co | Co | ≤ 1.00 |
| C | C | ≤ 0.08 |
| Mn | Mn | ≤ 1.00 |
| Si | Si | ≤ 0.50 |
Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.
What are the mechanical properties of Inconel X-750?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 1170 MPa (aged) | Room temperature |
| Yield strength (0.2% offset) | ≥ 790 MPa (aged) | Room temperature |
| Elongation | ≥ 15 % | Gauge length 50 mm / 4D |
| Hardness | ≥ 30 HRC | Brinell / Rockwell |
What are the physical properties of Inconel X-750?
| Property | Value |
|---|---|
| Density | 8.28 g/cm³ |
| Melting range | 1393–1427 °C |
| Thermal conductivity | 12.0 W/m·K |
| Elastic modulus | 214 GPa |
| Maximum service temperature | 700 °C |
What are the key characteristics of Inconel X-750?
- Outstanding high-temperature relaxation resistance for springs and fasteners
- Combines strength and oxidation resistance below 700 °C
- Oxidation resistant to about 980 °C
- Available as ultra-thin precision strip for elastic elements
Where is Inconel X-750 used?
- Aero-engine turbine blades and bolts
- High-temperature coil and disc springs, seal rings
- Nuclear reactor internals and hold-down springs
- Gas turbine blades and rotor bolts
- Heat-treat fixtures
Which standards and specifications cover Inconel X-750?
- ASTM B637
- AMS 5667
- AMS 5698
- UNS N07750
What product forms are available?
Frequently asked questions
What heat treatment is used for X-750 springs?
Spring temper typically uses solution treatment at 1150 °C, ageing at 843 °C for 24 hours, air cool, then 704 °C for 20 hours and air cool (AMS 5698/5699), giving the best relaxation resistance. Structural parts needing higher strength use 980 °C solution plus a 732 °C/620 °C double age.
Need Inconel X-750 bar, tube, plate or forgings?
Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.
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