Alloy 75,Nimonic 75,UNS N06075,E FORU

### **Alloy 75 / Nimonic® 75 / UNS N06075** **Nickel-Chromium Solid-Solution Strengthened Alloy for High-Temperature Service** #### **1. Overview** Alloy 75, most commonly known by the trade name **Nimonic® 75**, is a nickel-chromium austenitic alloy that derives its strength from solid-solution hardening. It was one of the first high-temperature alloys developed and remains a standard material for applications requiring excellent oxidation resistance, good elevated temperature strength, and high formability. Unlike precipitation-hardenable superalloys, Nimonic 75 is used in the solution-annealed condition, making it relatively easy to fabricate and weld. It is a cost-effective solution for a wide range of high-temperature components. #### **2. Chemical Composition (Weight %)** The typical chemical composition of Nimonic 75 is outlined below. The balance is Nickel (Ni). | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Forms the stable austenitic matrix, providing fundamental high-temperature strength and corrosion resistance. | | **Chromium (Cr)** | 18.0 - 21.0 | Confers outstanding resistance to oxidation and scaling at high temperatures. | | **Iron (Fe)** | 5.0 max | Balances cost; controlled to maintain microstructural stability. | | **Titanium (Ti)** | 0.2 - 0.6 | Acts as a carbon stabilizer, forming TiC to improve creep strength. | | **Carbon (C)** | 0.08 - 0.15 | Contributes to elevated temperature strength via carbide formation. | | **Manganese (Mn)** | 1.0 max | Aids in deoxidation during melting and improves hot workability. | | **Silicon (Si)** | 1.0 max | Enhances oxidation resistance. | | **Copper (Cu)** | 0.5 max | - | | **Cobalt (Co)** | 0.5 max | - | | **Sulfur (S)** | 0.015 max | Impurity, kept low to prevent hot shortness and embrittlement. | #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.40 g/cm³ (0.304 lb/in³) | | **Melting Range** | ~ 1380 - 1395 °C (2516 - 2543 °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): **16.5 x 10⁻⁶/°C** (9.2 x 10⁻⁶/°F) | | **Thermal Conductivity** | 16.5 W/m·K (114 Btu·in/hr·ft²·°F) at 20°C (68°F) | | **Specific Heat** | 440 J/kg·K (0.105 Btu/lb·°F) at 20°C (68°F) | | **Electrical Resistivity** | 1.09 μΩ·m at 20°C (68°F) | | **Modulus of Elasticity (Young's Modulus)** | 214 GPa (31.0 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 815°C (1500°F) | | :--- | :--- | :--- | | **Tensile Strength** | 690 - 860 MPa (100 - 125 ksi) | ~110 MPa (16 ksi) | | **Yield Strength (0.2% Offset)** | 250 - 450 MPa (36 - 65 ksi) | ~85 MPa (12 ksi) | | **Elongation (in 50 mm / 2 in)** | 30% - 45% | ~45% | | **Hardness (Rockwell B)** | 80 - 95 HRB | - | #### **5. International Standards** Nimonic 75 is covered by several international and industry-specific standards: * **ASTM:** * **B 163 / B 164 / B 166:** Standard Specification for Seamless and Welded Tube, Rod, and Bar. * **B 168:** Standard Specification for Plate, Sheet, and Strip. * **AMS:** AMS 5548 (Sheet, Strip, and Plate), AMS 5698 (Wire for Springs) * **BS / EN:** * **BS HR 501:** Aerospace series. * **EN 10095:** Heat resisting steels and nickel alloys. * **UNS:** N06075 * **DIN:** 2.4951 (Material Number) #### **6. Product Applications** Nimonic 75 is widely used in applications demanding reliability at high temperatures: * **Aerospace & Gas Turbines:** * Combustion chamber components (liners, casings) * Turbine igniters * Exhaust system components * **Industrial Furnaces & Heat Treatment:** * Heat treatment baskets, trays, and fixtures * Radiant tubes * Thermocouple protection sheaths * **Power Generation:** * Boiler components * Heat exchangers * **General Engineering:** * High-temperature fasteners * Springs for elevated temperature service #### **7. Key Characteristics & Advantages** * **Excellent Oxidation Resistance:** Superior scaling resistance up to 1150°C (2100°F) due to its high chromium content. * **Good High-Temperature Strength:** Maintains useful load-bearing capacity at temperatures where carbon and low-alloy steels would fail. * **Excellent Formability and Weldability:** Can be readily fabricated using conventional techniques, an advantage over many more complex precipitation-hardening superalloys. * **Cost-Effectiveness:** Provides a favorable balance of performance and cost for many high-temperature applications. * **Thermal Stability:** Resists microstructural degradation 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 1654 gallon liquid totes Special package is available on request.