Nickelvac X-750 Nickel Superalloy,UNS N07750; AMS 5667, 5668, 5669, 5670, 5671. MIL-N-24114, ASTM B 637,E FORU

### **Product Introduction: Nickelvac® X-750 Nickel-Chromium Superalloy (UNS N07750)** **Nickelvac X-750** is a precipitation-hardenable nickel-chromium superalloy renowned for its high strength, excellent corrosion resistance, and outstanding mechanical properties at temperatures up to 1300°F (700°C) and beyond. It achieves its superior strength through a precipitation hardening heat treatment that forms a uniform dispersion of gamma prime [γ'] phase (Ni₃(Al, Ti)) within the matrix. This combination of high strength, good fabricability, and resistance to oxidation and creep has made it a cornerstone material for critical applications in aerospace, industrial, and nuclear environments for decades. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of Nickelvac X-750, conforming to standards like AMS 5667, is as follows: | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | ≥ 70.0 | **Aluminum (Al)** | 0.40 - 1.00 | | **Chromium (Cr)** | 14.00 - 17.00 | **Titanium (Ti)** | 2.25 - 2.75 | | **Iron (Fe)** | 5.00 - 9.00 | **Niobium + Tantalum (Nb+Ta)** | 0.70 - 1.20 | | **Manganese (Mn)**| ≤ 1.00 | **Silicon (Si)** | ≤ 0.50 | | **Copper (Cu)** | ≤ 0.50 | **Sulfur (S)** | ≤ 0.01 | | **Carbon (C)** | ≤ 0.08 | **Phosphorus (P)** | ≤ 0.015 | | **Cobalt (Co)** | ≤ 1.00* | **Boron (B)** | 0.006 max | *Note: Cobalt is typically controlled to a low level, but specific customer or application requirements may vary.* --- #### **2. Physical Properties** Typical physical properties for Nickelvac X-750 alloy are provided below. | Property | Metric Units | Imperial Units | | :--- | :--- | :--- | | **Density** | 8.28 g/cm³ | 0.299 lb/in³ | | **Melting Range** | ~1390 - 1430 °C | ~2530 - 2610 °F | | **Specific Heat (20°C)** | 431 J/kg·K | 0.103 Btu/lb·°F | | **Thermal Conductivity (20°C)** | 11.7 W/m·K | 81 Btu·in/hr·ft²·°F | | **Mean Coefficient of Thermal Expansion (20-100°C)** | 12.8 μm/m·°C | 7.1 μin/in·°F | | **Modulus of Elasticity (Tensile)** | 214 GPa | 31 x 10⁶ psi | | **Electrical Resistivity** | 1.22 μΩ·m | - | --- #### **3. Mechanical Properties (Typical)** Mechanical properties are highly dependent on the specific heat treatment condition. The following are typical minimum values for material in the **Solution Annealed and Double Aged** condition (per AMS 5667). **Common Heat Treatment for High Strength:** * **Solution Anneal:** 1800°F ± 25°F (982°C ± 14°C), rapid cool. * **Aging:** 1300°F (705°C) for 20 hours, air cool + 1150°F (621°C) for 20 hours, air cool. **Room Temperature Mechanical Properties (Typical Minimums):** | Property | Value | | :--- | :--- | | **Tensile Strength** | 1200 MPa (174 ksi) | | **Yield Strength (0.2% Offset)** | 830 MPa (120 ksi) | | **Elongation (in 4D)** | 20% | | **Reduction of Area** | 24% | --- #### **4. International Standards & Specifications** Nickelvac X-750 is covered by a comprehensive set of international and industry-specific standards, ensuring quality and consistency across different product forms. **Aerospace Material Specifications (AMS - SAE International):** * **AMS 5667:** Bars, forgings, and rings (Solution Annealed and aged). * **AMS 5668:** Forging stock (Solution Annealed). * **AMS 5669:** Sheet, strip, and plate (Solution Annealed and precipitation heat treated). * **AMS 5670:** Wire (Solution Annealed and precipitation heat treated). * **AMS 5671:** Spring wire (Solution Annealed, cold drawn, and precipitation heat treated). **Other Key Standards:** * **UNS:** N07750 * **U.S. Military Standard:** **MIL-N-24114** (Bars, wire, forgings, and rings for aerospace vehicles) * **ASTM International:** * **ASTM B637**: Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service. * **European Standards (EN):** 2.4669 * **ISO:** 9724 (Nickel alloy bars) --- #### **5. Product Applications** The unique properties of Nickelvac X-750 make it indispensable in a wide range of critical, high-performance applications. * **Aerospace & Gas Turbines:** * Turbine blades and vanes * Engine disks, rotors, and seals * High-strength bolts, fasteners, and springs * Thrust reverser components * Combustion chamber liners * **Nuclear Industry:** * Reactor core components (e.g., spacer grids, guide tubes, springs) * Fuel assembly hardware * **Industrial & General Engineering:** * High-temperature springs and bellows * Forming tools and die inserts * Heat treating fixtures and trays * Critical fasteners for high-pressure/temperature systems in oil & gas --- #### **Summary of Key Advantages** * **High Strength:** Excellent tensile, yield, and creep-rupture strength maintained from cryogenic temperatures up to ~1300°F (700°C). * **Excellent Creep & Stress Rupture Properties:** Reliable performance under sustained loads at elevated temperatures. * **Good Corrosion Resistance:** Resists oxidation and corrosion in a variety of environments, similar to Alloy 600. * **Outstanding Fatigue Resistance:** Withstands cyclic loading, making it ideal for rotating parts and springs. * **Proven Reliability:** A long-standing, well-understood alloy with an extensive and successful service history in the most demanding fields. **Disclaimer:** The information provided here is for reference purposes. Specific properties and performance are dependent on the manufacturing process, heat treatment, and final product form. For critical applications, always consult the official material specifications and the alloy producer's data sheets.

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 3128 gallon liquid totes Special package is available on request.