Inconel® X-750
Inconel X-750 is a precipitation-hardenable nickel-chromium alloy used for its corrosion and oxidation resistance and high strength at temperatures up to 1300°F (700°C). Ideally suited for components that require high relaxation resistance, such as springs and bolts.
- Common Forms: Spring Wire, Round Bar, Sheet, Strip.
- Key Feature: Excellent relaxation resistance (retains spring force at heat).
- Comparison: Similar corrosion resistance to Inconel 600 but much stronger.
- Hardening: Age-hardened via Aluminum and Titanium additions.
If your application involves springs or fasteners operating in high-temperature environments (up to 1300°F), Inconel X-750 is the industry standard. It provides the corrosion resistance of Inconel 600 but with the added benefit of age-hardening, ensuring that springs do not "relax" or lose their tension under heat load.
Relaxation Resistance
Retains over 90% of its initial stress after long-term exposure to temperatures up to 1100°F, making it superior for critical spring applications.
High Tensile Strength
Achieves high strength properties through heat treatment (precipitation hardening) similar to Alloy 718, but is often more cost-effective for springs.
Corrosion Resistance
Offers excellent resistance to chloride-ion stress-corrosion cracking and oxidizing environments, comparable to Alloy 600.
| Element | Content (%) |
|---|---|
| Nickel (Ni) + Cobalt | 70.0 min |
| Chromium (Cr) | 14.0 - 17.0 |
| Titanium (Ti) | 2.25 - 2.75 |
| Aluminum (Al) | 0.40 - 1.00 |
| Niobium (Nb) | 0.70 - 1.20 |
| Iron (Fe) | 5.0 - 9.0 |
*Note: Titanium and Aluminum are the key elements responsible for the precipitation hardening response.
| Product Form | Standards (ASTM / AMS / ASME) |
|---|---|
| Bar, Forgings | ASTM B637, AMS 5667, AMS 5671 |
| Spring Wire | AMS 5698 (No. 1 Temper), AMS 5699 (Spring Temper) |
| Plate, Sheet, Strip | AMS 5542, AMS 5598 |
As the premier alloy for high-relaxation resistance, we specialize in supplying Inconel X-750 in wire and bar forms tailored for spring manufacturing and high-stress aerospace fastening.
Spring Wire
The most critical form for this alloy. Supplied in No. 1 Temper and Spring Temper for manufacturing high-temperature helical and flat springs.
Fasteners
Age-hardened bolts, studs, and screws that maintain their clamping force without relaxing at temperatures up to 1300°F.
Bar & Rod
Ready for precision machining into gas turbine rotor bolts, high-temperature valve internals, and specialized aerospace hardware.
Plate, Sheet & Strip
High-strength flat rolled products used for fabricating high-temperature bellows, turbine seals, and liquid-fuel rocket thrust chambers.
Forgings & Rings
High-integrity forged rings and turbine wheels designed to withstand extreme rotational stresses in gas turbine engines.
| Property | Typical Values (Room Temp) |
|---|---|
| Tensile Strength | 160 - 190 ksi (1100 - 1310 MPa) |
| Yield Strength (0.2% Offset) | 115 - 140 ksi (790 - 965 MPa) |
| Elongation | 15 - 25 % |
| Hardness (Rockwell C) | 30 - 40 HRC |
*Note: Properties vary greatly depending on the specific heat treatment cycle (e.g., Spring Temper vs. Equalized).
Springs & Bellows
The primary application: helical springs, disc springs, and torsion bars operating in hot engines or valves.
Gas Turbines
Rotor blades, wheels, bolts, and other structural members requiring high strength.
Rocket Engines
Thrust chambers and high-pressure cryogenic pumps.
Nuclear Reactors
In-core structural springs, control rod components, and fuel element spacers.
Need Inconel X-750 Spring Wire?
We specialize in Inconel X-750 wire and bar stock for spring manufacturing. Available in various tempers to meet AMS specifications.
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