INCONEL Alloy X-750,UNS N07750，1

### **Product Introduction: INCONEL® Alloy X-750 (UNS N07750)** **INCONEL® Alloy X-750** is a precipitation-hardenable nickel-chromium alloy known for its high strength and excellent corrosion resistance at temperatures up to 1300°F (700°C). It exhibits a combination of desirable properties derived from its composition, which is similar to INCONEL Alloy 600 but with additions of aluminum and titanium that allow it to be strengthened by a specific heat treatment process. This alloy offers good fatigue resistance, high rupture and creep strength, and outstanding relaxation resistance, making it particularly suitable for springs and other high-stress components in elevated temperature service. It maintains its properties in a wide range of corrosive environments and is especially resistant to chloride-ion stress-corrosion cracking. --- ### **International Standards & Material Equivalents** INCONEL Alloy X-750 is covered by numerous international specifications across different product forms. | Standard Type | Standard Number | Designation / Product Form | | :--- | :--- | :--- | | **UNS (USA)** | **N07750** | **INCONEL Alloy X-750** | | **AMS (Aerospace)** | AMS 5542 | Sheet, Strip, and Plate | | **AMS (Aerospace)** | AMS 5698 | Bar, Forgings, and Ring | | **AMS (Aerospace)** | AMS 5699 | Rivet Wire | | **ASTM** | B637 | Rod, Bar, and Forgings | | **ASTM** | B637 | Plate and Sheet | | **ASME** | SB-637 | Pressure Vessel Code Edition | | **DIN (Germany)** | 17742 | NiCr15Fe7TiAl | | **Werkstoff Nr.** | **2.4669** | **2.4669** | > **Note:** INCONEL® is a registered trademark of Special Metals Corporation. The primary identifier is **UNS N07750**. --- ### **Chemical Composition** The composition is balanced to achieve optimal precipitation hardening response while maintaining good corrosion resistance. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 70.0 min. | | **Chromium (Cr)** | 14.0 - 17.0 | | **Iron (Fe)** | 5.0 - 9.0 | | **Titanium (Ti)** | 2.25 - 2.75 | | **Aluminum (Al)** | 0.40 - 1.00 | | **Niobium (Nb)** | 0.70 - 1.20 | | **Cobalt (Co)** | 1.0 max. | | **Manganese (Mn)** | 1.0 max. | | **Silicon (Si)** | 0.50 max. | | **Copper (Cu)** | 0.50 max. | | **Carbon (C)** | 0.08 max. | | **Sulfur (S)** | 0.01 max. | --- ### **Physical Properties** Alloy X-750 possesses physical properties suitable for high-temperature applications. | Property | Value | | :--- | :--- | | **Density** | 8.28 g/cm³ (0.299 lb/in³) | | **Melting Point** | 1390 - 1425 °C (2535 - 2600 °F) | | **Thermal Conductivity** | 12.3 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.22 μΩ·m (at 20°C) | | **Modulus of Elasticity** | 214 GPa (31 x 10⁶ psi) | | **Coefficient of Thermal Expansion** | 13.1 μm/m·°C (20-100°C) | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties (Typical for Aged Condition - ASTM B637)** The alloy achieves its maximum strength through a solution treatment followed by a precipitation hardening (aging) process. | Property | Value (Room Temperature, Aged) | | :--- | :--- | | **Tensile Strength** | 1034 - 1241 MPa (150 - 180 ksi) | | **Yield Strength (0.2% Offset)** | 689 - 896 MPa (100 - 130 ksi) | | **Elongation** | 20% - 25% | | **Hardness (Rockwell C)** | 28 - 35 HRC | --- ### **Key Characteristics & Advantages** 1. **High Strength at Elevated Temperatures:** Maintains excellent tensile, creep, and rupture strength up to 700°C (1300°F). 2. **Excellent Relaxation Resistance:** Particularly valuable for spring applications where load retention at high temperatures is critical. 3. **Good Corrosion Resistance:** Resists oxidation and corrosion in various environments, similar to INCONEL Alloy 600, with particular resistance to chloride-ion stress-corrosion cracking. 4. **Outstanding Fatigue Resistance:** Performs well under cyclic loading conditions. 5. **Age-Hardenable:** Can be heat treated to various strength levels to meet specific application requirements. --- ### **Product Applications** INCONEL Alloy X-750 is widely used in demanding applications across multiple industries. * **Aerospace & Jet Engines:** * **Gas turbine blades,** disks, seals, and rotors * **Engine mounts** and structural components * **Fasteners,** bolts, and studs * **Springs** and bellows for high-temperature service * **Nuclear Power:** * **Reactor core components** * **Spacer grids** and other internal structures * **Fasteners** and springs for nuclear service * **Industrial Gas Turbines:** * **Turbine blades** and wheels * **Bolting** and other high-strength components * **Other Applications:** * **Hot-work tooling** and forming equipment * **Test machine components** requiring high strength-to-weight ratio * **Corrosion-resistant fasteners** for chemical processing ### **Summary** **INCONEL Alloy X-750 (UNS N07750)** is a versatile, precipitation-hardenable nickel-chromium alloy that provides an excellent combination of **high strength, good corrosion resistance, and outstanding relaxation resistance at elevated temperatures**. Its ability to be heat treated to specific strength levels makes it particularly valuable for critical applications in aerospace, nuclear power, and industrial gas turbines. Governed by standards such as **AMS 5542** and **ASTM B637**, it remains a preferred material for springs, fasteners, and turbine components where reliability under high stress and temperature is paramount.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3303 gallon liquid totes Special package is available on request.