M-252 Nickel Superalloy,UNS N07252; AMS 5756, 5757. ASTM B 637., M252, M 252,E FORU

**Product Overview: M-252 Nickel Superalloy (UNS N07252)** **M-252** (UNS N07252) is a high-strength, precipitation-hardenable nickel-chromium-cobalt superalloy specifically developed for high-temperature applications requiring exceptional strength and oxidation resistance. Conforming to AMS 5756, AMS 5757, and ASTM B637 standards, this advanced alloy maintains excellent mechanical properties at temperatures up to 980°C (1800°F), making it particularly suitable for critical rotating components in gas turbine engines and other high-stress applications. --- ### **Key Characteristics & Advantages** - **Excellent High-Temperature Strength**: Maintains mechanical properties up to 980°C (1800°F) - **Superior Creep Resistance**: Outstanding long-term performance under stress at elevated temperatures - **Excellent Oxidation Resistance**: Reliable performance in high-temperature oxidizing atmospheres - **Good Thermal Stability**: Resists microstructural degradation under prolonged thermal exposure - **Optimized Precipitation Hardening**: Achieves high strength through γ' precipitation - **Good Fabricability**: Can be processed using conventional manufacturing methods --- ### **Chemical Composition (Typical Weight %)** | Element | Content Range (%) | Function Description | |------------------|-------------------|-----------------------| | **Nickel (Ni)** | Balance | Base element providing austenitic matrix | | **Chromium (Cr)**| 18.0-21.0 | Primary element for oxidation and corrosion resistance | | **Cobalt (Co)** | 9.0-11.0 | Enhances high-temperature strength and stability | | **Molybdenum (Mo)**| 9.00-10.50 | Solid solution strengthener | | **Aluminum (Al)**| 1.10-1.50 | Forms γ' precipitation hardening phase | | **Titanium (Ti)**| 2.40-2.80 | Enhances γ' formation and stability | | **Iron (Fe)** | ≤2.0 | Controlled impurity | | **Carbon (C)** | 0.12-0.20 | Controlled for carbide formation | | **Boron (B)** | 0.003-0.010 | Enhances grain boundary strength | | **Zirconium (Zr)**| 0.03-0.08 | Improves creep resistance | --- ### **Physical Properties** | Property | Typical Value | Test Conditions | |---------------------------------|------------------------|--------------------------| | **Density** | 8.25 g/cm³ | At room temperature | | **Melting Range** | 1290-1345°C | Solidus-Liquidus | | **Thermal Expansion Coefficient**| 13.5 × 10⁻⁶/°C | 20-1000°C range | | **Thermal Conductivity** | 14.8 W/m·K | At 800°C | | **Specific Heat Capacity** | 450 J/kg·K | At 800°C | | **Electrical Resistivity** | 1.22 μΩ·m | At 20°C | | **Young's Modulus** | 214 GPa | At room temperature | --- ### **Mechanical Properties** #### **Solution Treated and Aged Condition** | Property | Temperature | Typical Value | |------------------------|-------------|----------------------| | **Tensile Strength** | 20°C | 1200-1350 MPa | | **Tensile Strength** | 815°C | 860-930 MPa | | **Yield Strength (0.2%)** | 20°C | 830-950 MPa | | **Yield Strength (0.2%)** | 815°C | 620-690 MPa | | **Elongation** | 20°C | 15-20% | | **Elongation** | 815°C | 12-16% | | **Reduction of Area** | 20°C | 18-24% | | **Creep Rupture Life** | 815°C/310 MPa | 100-180 hours | --- ### **Heat Treatment** Standard heat treatment sequence includes: - **Solution Treatment**: 1080°C ± 10°C for 4 hours, rapid air cool - **Primary Aging**: 845°C ± 10°C for 4 hours, air cool - **Secondary Aging**: 760°C ± 10°C for 16 hours, air cool --- ### **International Standards & Specifications** M-252 complies with the following international standards: - **AMS 5756**: Bars, Forgings, and Rings - **AMS 5757**: Sheet, Strip, and Plate - **ASTM B637**: Precipitation Hardening Nickel Alloy Bars, Forgings, and Forging Stock - **GE Specification**: S63 - **Pratt & Whitney**: PWA 1014 - **Rolls-Royce**: RPS 708 - **ISO 9724**: Nickel Alloys for High-Temperature Service --- ### **Applications** 1. **Aerospace Gas Turbine Engines**: - Turbine blades and vanes - Turbine disks and rotors - Compressor components - Shafts and spools - Combustion chamber parts 2. **Industrial Gas Turbines**: - Power generation turbine components - Mechanical drive turbine parts - Hot gas path components - Turbine wheels and disks 3. **High-Temperature Fasteners**: - Engine bolts and studs - High-temperature nuts - Specialized fastening systems - Critical structural fasteners 4. **Other High-Temperature Applications**: - Rocket engine components - Nuclear reactor parts - High-temperature tooling - Specialized industrial equipment --- ### **Manufacturing Considerations** - **Forging**: Hot workable in temperature range 1050-1150°C - **Machining**: Requires specialized tools and techniques for nickel-based superalloys - **Welding**: Weldable using matching filler metals with proper procedures - **Heat Treatment**: Requires precise control of time-temperature parameters - **Quality Control**: Stringent NDT requirements including ultrasonic and penetrant testing --- ### **Available Forms** - **Bar and Rod**: Various diameters and lengths - **Forgings**: Custom shapes and sizes - **Sheet and Plate**: Multiple thicknesses and sizes - **Wire**: For welding and fasteners - **Billet**: For subsequent manufacturing operations --- **Disclaimer**: *The information provided is for technical reference purposes only. M-252 is a specialized superalloy requiring proper processing and heat treatment to achieve specified properties. Actual performance may vary depending on manufacturing processes, heat treatment parameters, and specific application conditions. Users should consult with qualified materials engineers and adhere to OEM specifications for critical applications. All manufacturing and processing should follow approved procedures and quality standards.*

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 3122 gallon liquid totes Special package is available on request.