Ni-SA 939 Nickel Super Alloy,Ni-SA (Nickel Super Alloys)，1

### **Technical Datasheet: Ni-SA 939 Nickel Super Alloy** **Classification:** Precipitation-Hardenable Nickel-Based Superalloy **Common Names:** Ni-SA 939, INCONEL® 939, Alloy 939 **UNS Designation:** N08339 --- #### **1.0 Introduction** **Ni-SA 939** is a high-performance, precipitation-hardenable nickel-chromium superalloy specifically engineered for superior high-temperature capabilities in gas turbine applications. As part of the Ni-SA (Nickel Super Alloys) family, it achieves its exceptional properties through a combination of solid-solution strengthening and gamma prime (γ') precipitation hardening. The alloy is particularly noted for its **outstanding oxidation and hot corrosion resistance**, combined with **excellent creep rupture strength** at temperatures up to 1040°C (1900°F), making it ideal for the most demanding stationary and rotating turbine components. --- #### **2.0 Chemical Composition (Weight %)** | Element | Minimum | Maximum | Key Function | |---------|---------|---------|--------------| | **Nickel (Ni)** | **Balance** | | Forms the austenitic matrix | | **Chromium (Cr)** | 21.0 | 25.0 | **Exceptional oxidation/sulfidation resistance** | | **Cobalt (Co)** | 18.0 | 22.0 | Solid-solution strengthening | | **Molybdenum (Mo)** | 2.5 | 4.0 | Solid-solution strengthening | | **Titanium (Ti)** | 3.2 | 3.8 | **Primary gamma' former** (Ni₃Ti) | | **Aluminum (Al)** | 1.2 | 2.0 | **Gamma' former** (Ni₃Al) | | **Tantalum (Ta)** | 1.2 | 1.6 | Solid-solution strengthener & carbide former | | **Niobium (Nb)** | 0.8 | 1.5 | Gamma' former & carbide former | | **Iron (Fe)** | - | 1.0 | Kept low for stability | | **Carbon (C)** | 0.12 | 0.20 | Carbide formation for grain boundary strength | | **Zirconium (Zr)** | 0.02 | 0.12 | Grain boundary strengthening | | **Boron (B)** | 0.003 | 0.012 | Grain boundary strengthening | --- #### **3.0 Physical Properties** | Property | Value | Condition | |----------|-------|-----------| | **Density** | 8.21 g/cm³ (0.297 lb/in³) | Room temperature | | **Melting Range** | 1315-1370°C (2400-2500°F) | - | | **Thermal Expansion** | 13.8 μm/m·°C | 20-1000°C | | **Thermal Conductivity** | 12.1 W/m·K | 100°C | | **Specific Heat** | 460 J/kg·K | 20°C | | **Modulus of Elasticity** | 221 GPa (32.0×10⁶ psi) | Room temperature | --- #### **4.0 Mechanical Properties (Typical for Fully Heat-Treated Condition)** | Property | Room Temperature | 850°C (1562°F) | |----------|------------------|----------------| | **Tensile Strength** | 1150 MPa (167 ksi) | 620 MPa (90 ksi) | | **Yield Strength (0.2% Offset)** | 825 MPa (120 ksi) | 580 MPa (84 ksi) | | **Elongation** | 15% | 15% | | **Creep Rupture Strength (1000h)** | - | 180 MPa (26 ksi) at 950°C | --- #### **5.0 Key Characteristics & Applications** **5.1 Key Characteristics:** - **Superior Oxidation Resistance**: Outstanding performance in high-temperature oxidizing environments - **Excellent Creep Strength**: Maintains structural integrity under sustained load at extreme temperatures - **Good Thermal Fatigue Resistance**: Withstands repeated thermal cycling - **Optimized for Coatings**: Excellent substrate for thermal barrier coating systems - **Weldability**: Can be repaired using conventional welding techniques **5.2 Primary Applications:** - **Gas Turbine Engine Components**: - **Stationary Parts**: Combustion liners, transition ducts, nozzle guide vanes - **Rotating Parts**: Turbine blades and disks in high-temperature sections - **Industrial Turbines**: Hot section components for power generation - **Aerospace**: Afterburner components and exhaust systems --- #### **6.0 International Standards** | Product Form | Standard Number | Governing Body | |--------------|----------------|----------------| | **Bar & Forgings** | AMS 5942 | SAE International | | **Investment Castings** | AMS 5396 | SAE International | | **Sheet & Strip** | Proprietary | Manufacturer Specific | | **Welding Wire** | AMS 5838 | SAE International | | **European Standard** | DIN 2.4954 | Deutsches Institut für Normung | **Note:** Ni-SA 939 requires specific heat treatment cycles typically involving solution treatment around 1160°C followed by multi-step aging to optimize the γ' precipitation. The alloy's high chromium content provides superior hot corrosion resistance compared to many other nickel-based superalloys, while maintaining excellent high-temperature strength through its optimized aluminum and titanium content.

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 3274 gallon liquid totes Special package is available on request.