Alloy 80A,Nimonic 80A,UNS N07080,E FORU

### **Alloy 80A / Nimonic® 80A / UNS N07080** **Nickel-Chromium Precipitation-Hardenable Superalloy for High-Temperature Service** #### **1. Overview** **Alloy 80A**, commercially known as **Nimonic® 80A**, is a nickel-chromium precipitation-hardenable superalloy strengthened by additions of aluminum and titanium. Developed specifically for high-temperature applications requiring excellent creep resistance and strength, it offers superior mechanical properties at elevated temperatures along with good oxidation resistance. The alloy is typically supplied in the solution-annealed condition for fabrication and is subsequently age-hardened to achieve its optimum properties. It is widely used in aerospace and industrial gas turbine components. #### **2. Chemical Composition (Weight %)** The typical chemical composition of Nimonic 80A is outlined below. The balance is Nickel (Ni). | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Forms the austenitic matrix and provides fundamental high-temperature strength. | | **Chromium (Cr)** | 18.0 - 21.0 | Provides excellent oxidation and corrosion resistance at high temperatures. | | **Titanium (Ti)** | 1.8 - 2.7 | Primary precipitation hardening element forming γ' phase (Ni₃Ti). | | **Aluminum (Al)** | 1.0 - 1.8 | Co-precipitates with titanium to form γ' phase (Ni₃(Al,Ti)). | | **Cobalt (Co)** | 2.0 max | Enhances high-temperature strength and microstructural stability. | | **Iron (Fe)** | 3.0 max | Controlled impurity; kept low to maintain high-temperature properties. | | **Manganese (Mn)** | 1.0 max | Improves hot workability. | | **Silicon (Si)** | 1.0 max | Enhances oxidation resistance. | | **Copper (Cu)** | 0.5 max | Controlled impurity. | | **Carbon (C)** | 0.04 - 0.10 | Forms carbides for grain boundary strengthening. | | **Sulfur (S)** | 0.015 max | Impurity, kept low to prevent hot shortness. | | **Boron (B)** | 0.008 max | Enhances creep strength and grain boundary cohesion. | #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.19 g/cm³ (0.296 lb/in³) | | **Melting Range** | ~ 1350 - 1400 °C (2462 - 2552 °F) | | **Mean Coefficient of Thermal Expansion** | 20 - 500°C (68 - 932°F): **13.9 x 10⁻⁶/°C** (7.7 x 10⁻⁶/°F)
20 - 800°C (68 - 1472°F): **15.2 x 10⁻⁶/°C** (8.4 x 10⁻⁶/°F) | | **Thermal Conductivity** | 17.5 W/m·K (121 Btu·in/hr·ft²·°F) at 20°C (68°F)
25.6 W/m·K (177 Btu·in/hr·ft²·°F) at 800°C (1472°F) | | **Specific Heat** | 440 J/kg·K (0.105 Btu/lb·°F) at 20°C (68°F) | | **Electrical Resistivity** | 1.24 μΩ·m at 20°C (68°F) | | **Modulus of Elasticity (Young's Modulus)** | 224 GPa (32.5 x 10⁶ psi) at 20°C (68°F) | | **Magnetic Permeability** | Essentially non-magnetic in annealed condition. | #### **4. Mechanical Properties (Typical for Aged Condition)** | Property | At Room Temperature | At 750°C (1382°F) | | :--- | :--- | :--- | | **Tensile Strength** | 1000 - 1200 MPa (145 - 174 ksi) | ~550 MPa (80 ksi) | | **Yield Strength (0.2% Offset)** | 700 - 850 MPa (102 - 123 ksi) | ~450 MPa (65 ksi) | | **Elongation (in 50 mm / 2 in)** | 15% - 25% | 15% - 30% | | **Hardness (Rockwell C)** | 28 - 35 HRC | - | #### **5. International Standards** Nimonic 80A is covered by several international and industry-specific standards: * **ASTM:** * **B 637:** Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service * **AMS:** * **AMS 5548:** Sheet, Strip, and Plate * **AMS 5698:** Wire for Springs * **AMS 5704:** Bar and Forging Stock * **BS / EN:** * **BS HR 504:** Aerospace series * **EN 10095:** Heat resisting steels and nickel alloys * **UNS:** N07080 * **DIN:** 2.4952 (Material Number) * **ISO:** ISO 9723, ISO 9724 #### **6. Product Applications** Nimonic 80A is extensively used in high-temperature applications requiring creep resistance and strength: * **Aerospace & Gas Turbines:** * Turbine blades and vanes * Discs and shafts * Combustion chamber components * **Industrial Gas Turbines:** * Rotor blades * Stator vanes * High-temperature fasteners * **Automotive Turbochargers:** * Turbine wheels * Shafts * **Nuclear Industry:** * Core components * Heat exchangers * **General Engineering:** * High-temperature springs * Fasteners for elevated temperature service #### **7. Key Characteristics & Advantages** * **Excellent Creep Resistance:** Maintains strength under sustained loading at high temperatures up to 815°C (1500°F) * **Outstanding High-Temperature Strength:** Superior mechanical properties maintained at elevated temperatures * **Good Oxidation Resistance:** Resists scaling and oxidation in high-temperature environments * **Precipitation Hardenable:** Can be heat treated to achieve optimum mechanical properties * **Good Thermal Fatigue Resistance:** Withstands cyclic thermal stresses * **Microstructural Stability:** Maintains properties during long-term exposure at high temperatures --- **Disclaimer:** *Nimonic® is a registered trademark of Rolls-Royce plc. The values provided are typical and for informational purposes only. For critical applications, always consult the official material data sheets from the supplier and relevant design codes.*

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 1656 gallon liquid totes Special package is available on request.