NIMONIC Alloy 901,Nickel-Chromium Alloy; Werkstoff Nr. 2.4662, UNS N09901; 1

### **Product Introduction: NIMONIC® Alloy 901** **NIMONIC® Alloy 901** is a precipitation-hardenable nickel-iron-chromium superalloy specifically developed for high-temperature applications requiring exceptional strength and creep resistance up to 600°C (1112°F). This alloy represents an optimal balance between performance and cost-effectiveness, offering mechanical properties comparable to more expensive cobalt-containing superalloys while maintaining excellent structural stability and fabrication characteristics. The alloy's unique composition provides outstanding resistance to thermal fatigue and oxidation, combined with high tensile and creep-rupture strength. Its well-balanced properties make it particularly suitable for critical rotating components in gas turbine engines and other high-temperature mechanical systems where reliability and long-term performance are essential. --- ### **Chemical Composition** The chemical composition is precisely controlled to achieve optimal mechanical properties and microstructural stability: | Element | Content (%) | | | | | **Nickel (Ni)** | 40.0 - 45.0 | | **Chromium (Cr)** | 11.0 - 14.0 | | **Iron (Fe)** | Balance | | **Molybdenum (Mo)** | 5.0 - 6.5 | | **Titanium (Ti)** | 2.8 - 3.1 | | **Carbon (C)** | 0.05 - 0.10 | | **Silicon (Si)** | 0.40 max | | **Manganese (Mn)** | 0.50 max | | **Aluminum (Al)** | 0.30 max | | **Boron (B)** | 0.02 - 0.04 | | **Copper (Cu)** | 0.50 max | --- ### **Physical Properties** NIMONIC Alloy 901 exhibits excellent physical characteristics for high-temperature service: | Property | Value | | | | | **Density** | 8.21 g/cm³ | | **Melting Point** | 1360-1405 °C | | **Thermal Conductivity** | 13.5 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.15 μΩ·m | | **Modulus of Elasticity** | 214 GPa (at 20°C) | | **Coefficient of Thermal Expansion** | 14.2 μm/m·°C (20-500°C) | | **Specific Heat Capacity** | 460 J/kg·K | | **Magnetic Response** | Slightly magnetic | --- ### **Mechanical Properties** The alloy demonstrates superior mechanical performance across its operational temperature range: **Room Temperature Properties (Solution Treated and Aged):** - **Tensile Strength:** 1100-1300 MPa - **Yield Strength (0.2% Offset):** 750-950 MPa - **Elongation:** 12-20% - **Reduction of Area:** 18-25% - **Hardness:** 32-40 HRC **High-Temperature Performance:** - **Creep Rupture Strength (600°C/1000h):** 350 MPa - **Fatigue Strength (550°C):** 420 MPa - **Stress Rupture Life (650°C/300MPa):** >500 hours --- ### **Heat Treatment** **Standard Heat Treatment Cycle:** - **Solution Treatment:** 1090°C ± 10°C, 2-4 hours, oil or water quench - **Aging Treatment:** 775°C ± 10°C, 4-8 hours, air cool **Alternative Treatments:** - Double aging treatments for optimized properties - Stress relief treatments for complex components --- ### **Key Characteristics & Advantages** 1. **Excellent High-Temperature Strength** - Superior creep resistance up to 600°C - High tensile and yield strength retention - Outstanding thermal fatigue resistance 2. **Cost-Effective Performance** - Lower cost than cobalt-containing superalloys - Excellent strength-to-cost ratio - Reduced raw material costs with iron-base composition 3. **Good Fabricability** - Excellent hot workability and forgeability - Good machinability in heat-treated condition - Suitable for conventional manufacturing processes 4. **Microstructural Stability** - Resistant to sigma phase formation - Stable mechanical properties during long-term exposure - Good resistance to aging effects --- ### **Product Applications** **Aerospace Industry:** - Turbine disks and rotors - Compressor blades and vanes - Shafts and rotating components - Engine mounts and structural parts **Power Generation:** - Gas turbine components - Turbine disks and wheels - High-temperature bolts and fasteners - Power transmission shafts **Industrial Applications:** - High-temperature fasteners and bolts - Nuclear reactor components - Chemical processing equipment - High-strength structural components --- ### **International Standards** NIMONIC Alloy 901 is recognized under multiple international specifications: | Standard Type | Standard Number | Description | | | | | | **Werkstoff Nr.** | 2.4662 | Material Number | | **UNS** | N09901 | Unified Numbering System | | **BS** | HR53 | British Standard | | **SAE AMS** | 5660, 5661 | Aerospace Material Specifications | | **WL Nr.** | 2.4662 | Alternative Material Number | | **AFNOR** | Z8 NC DT42 | French Standard | | **AECMA** | Pr EN 2176-2178 | European Aerospace Standards | --- ### **Summary** **NIMONIC Alloy 901** represents an economically optimized nickel-iron-chromium superalloy that delivers exceptional high-temperature mechanical properties while maintaining cost-effectiveness. Its unique iron-nickel base composition provides an excellent balance between performance and manufacturing economics, making it particularly valuable for rotating components in gas turbine engines where high strength and creep resistance are critical at intermediate temperatures up to 600°C. The alloy's superior fabricability, combined with its stable microstructure and reliable long-term performance, has established it as a preferred material for turbine disks, shafts, and other critical rotating components in both aerospace and industrial applications. Comprehensive certification to major international standards including Werkstoff 2.4662, UNS N09901, and multiple aerospace specifications ensures consistent quality and reliability, providing engineers with a proven and cost-effective solution for demanding high-temperature mechanical applications.

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 3319 gallon liquid totes Special package is available on request.