Alloy 86,Nimonic 86,,E FORU

### **Alloy 86 / Nimonic® 86 / UNS N09866** **High-Chromium Nickel-Based Superalloy for Extreme Oxidation Resistance** #### **1. Overview** **Alloy 86**, commercially known as **Nimonic® 86**, is a nickel-chromium superalloy specifically developed for applications requiring exceptional oxidation and corrosion resistance at very high temperatures. With a chromium content significantly higher than most nickel-based alloys, Nimonic 86 exhibits outstanding resistance to scaling in oxidizing, sulfidizing, and other aggressive environments up to 1150°C (2100°F). The alloy is strengthened by solid-solution hardening and carbide precipitation, making it suitable for long-term service in extreme thermal conditions. #### **2. Chemical Composition (Weight %)** The typical chemical composition of Nimonic 86 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)** | 24.0 - 26.0 | Provides exceptional oxidation, sulfidation, and hot corrosion resistance. | | **Iron (Fe)** | 7.0 max | Controlled impurity; kept low to maintain corrosion resistance. | | **Cobalt (Co)** | 5.0 max | Enhances solid-solution strengthening. | | **Titanium (Ti)** | 0.3 max | Controlled to prevent excessive γ' formation. | | **Manganese (Mn)** | 1.0 max | Improves hot workability. | | **Silicon (Si)** | 0.5 - 1.0 | Enhances oxidation resistance through protective scale formation. | | **Carbon (C)** | 0.05 - 0.10 | Forms carbides for secondary strengthening. | | **Cerium (Ce)** | 0.01 - 0.10 | Improves oxide scale adhesion and spallation resistance. | | **Zirconium (Zr)** | 0.01 - 0.10 | Enhances creep strength and oxide scale properties. | | **Sulfur (S)** | 0.015 max | Impurity, kept low to prevent hot corrosion. | #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.16 g/cm³ (0.295 lb/in³) | | **Melting Range** | ~ 1350 - 1400 °C (2462 - 2552 °F) | | **Mean Coefficient of Thermal Expansion** | 20 - 500°C (68 - 932°F): **14.5 x 10⁻⁶/°C** (8.1 x 10⁻⁶/°F)
20 - 1000°C (68 - 1832°F): **16.8 x 10⁻⁶/°C** (9.3 x 10⁻⁶/°F) | | **Thermal Conductivity** | 14.8 W/m·K (102 Btu·in/hr·ft²·°F) at 20°C (68°F)
22.5 W/m·K (156 Btu·in/hr·ft²·°F) at 800°C (1472°F) | | **Specific Heat** | 460 J/kg·K (0.110 Btu/lb·°F) at 20°C (68°F) | | **Electrical Resistivity** | 1.18 μΩ·m at 20°C (68°F) | | **Modulus of Elasticity (Young's Modulus)** | 216 GPa (31.3 x 10⁶ psi) at 20°C (68°F) | | **Magnetic Permeability** | Essentially non-magnetic. | #### **4. Mechanical Properties (Typical for Annealed Condition)** | Property | At Room Temperature | At 800°C (1472°F) | At 1000°C (1832°F) | | :--- | :--- | :--- | :--- | | **Tensile Strength** | 690 - 830 MPa (100 - 120 ksi) | ~180 MPa (26 ksi) | ~80 MPa (12 ksi) | | **Yield Strength (0.2% Offset)** | 310 - 480 MPa (45 - 70 ksi) | ~140 MPa (20 ksi) | ~65 MPa (9 ksi) | | **Elongation (in 50 mm / 2 in)** | 30% - 45% | 40% - 60% | 50% - 70% | | **Hardness (Rockwell B)** | 85 - 100 HRB | - | - | #### **5. International Standards** Nimonic 86 is covered by several international and industry-specific standards: * **ASTM:** * **B 163:** Standard Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes * **B 166:** Standard Specification for Nickel-Chromium-Iron Alloy Rod, Bar, and Wire * **B 168:** Standard Specification for Nickel-Chromium-Iron Alloy Plate, Sheet, and Strip * **AMS:** * **AMS 5872:** Sheet, Strip, and Plate * **BS / EN:** * **BS HR 601:** Aerospace series * **EN 10095:** Heat resisting steels and nickel alloys * **UNS:** N09866 * **DIN:** 2.4953 (Material Number) * **ISO:** ISO 6207, ISO 9723 #### **6. Product Applications** Nimonic 86 is primarily used in extremely high-temperature applications where oxidation resistance is critical: * **Aerospace & Gas Turbines:** * Combustion chamber components * Afterburner parts * Turbine seals and shrouds * Exhaust system components * **Industrial Furnaces:** * Radiant tubes * Heat treatment fixtures and baskets * Furnace rollers and rails * Thermocouple protection sheaths * **Power Generation:** * Boiler components * Heat exchanger tubes * Superheater supports * **Chemical Processing:** * High-temperature reactor components * Pyroprocessing equipment * **Glass Manufacturing:** * Processing fixtures and tools #### **7. Key Characteristics & Advantages** * **Exceptional Oxidation Resistance:** Outstanding resistance to scaling up to 1150°C (2100°F) due to high chromium content * **Excellent Sulfidation Resistance:** Superior performance in sulfur-containing environments * **Good Hot Corrosion Resistance:** Resists attack from salt deposits and other corrosive agents * **High-Temperature Stability:** Maintains microstructural integrity during long-term exposure * **Good Creep Strength:** Suitable for loaded applications at elevated temperatures * **Excellent Thermal Fatigue Resistance:** Withstands cyclic thermal stresses * **Good Fabricability:** Can be formed and welded using standard techniques --- **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 1657 gallon liquid totes Special package is available on request.