Alloy 901,Nimonic 901 ,UNS N09901,E FORU

British Specs:，American Specs:AMS 5830 Welding Wire AMS 5660 Bar and Forgings AMS 5661 Bar and Forgings，German Specs:WS 2.4662

### **Technical Datasheet: Alloy 901 / Nimonic 901 / UNS N09901** --- #### **1. Overview** **Alloy 901** (commercially known as **Nimonic® 901**) is a nickel-iron-chromium precipitation-hardening superalloy designed for high-temperature applications requiring excellent creep resistance and mechanical strength. This age-hardenable alloy maintains good structural stability and corrosion resistance at temperatures up to 590°C (1100°F), making it suitable for critical components in gas turbines, aerospace, and power generation industries. The designations **Alloy 901**, **Nimonic 901**, and **UNS N09901** refer to this high-strength, precipitation-hardenable nickel-base superalloy known for its optimal balance of strength and fabricability. --- #### **2. Key Characteristics** * **Excellent High-Temperature Strength:** Maintains mechanical properties at elevated temperatures * **Outstanding Creep Resistance:** Superior creep rupture strength up to 590°C (1100°F) * **Good Fatigue Resistance:** Excellent resistance to thermal and mechanical fatigue * **Age-Hardenable:** Can be strengthened through precipitation hardening heat treatment * **Good Oxidation Resistance:** Suitable for continuous high-temperature service * **Moderate Corrosion Resistance:** Adequate resistance to various corrosive environments --- #### **3. Chemical Composition (Weight %)** The high-temperature performance of Alloy 901 is achieved through precise chemical balance and precipitation hardening elements. | Element | Minimum (%) | Maximum (%) | Key Function | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | 40.0 | 45.0 | Matrix element providing base strength and stability | | **Chromium (Cr)** | 11.0 | 14.0 | Provides oxidation resistance | | **Iron (Fe)** | Balance | - | Base element, contributes to solid solution strengthening | | **Molybdenum (Mo)** | 5.0 | 6.5 | Solid solution strengthener | | **Titanium (Ti)** | 2.8 | 3.1 | Primary precipitation hardening element (forms γ' phase) | | **Aluminum (Al)** | - | 0.30 | - | | **Carbon (C)** | 0.10 | 0.20 | Forms carbides for grain boundary strengthening | | **Boron (B)** | 0.01 | 0.02 | Enhances creep strength | | **Manganese (Mn)** | - | 0.50 | - | | **Silicon (Si)** | - | 0.40 | - | | **Sulfur (S)** | - | 0.015 | - | | **Copper (Cu)** | - | 0.50 | - | --- #### **4. Physical Properties (Typical)** | Property | Value | | :--- | :--- | | **Density** | 8.21 g/cm³ (0.297 lb/in³) | | **Melting Range** | 1330 - 1360 °C (2425 - 2480 °F) | | **Specific Heat (20°C)** | 440 J/kg·K | | **Thermal Conductivity** | 12.5 W/m·K (at 100°C) | | **Mean Coefficient of Thermal Expansion** | 13.5 μm/m·K (20 - 100°C) | | **Electrical Resistivity** | 1.18 μΩ·m | | **Modulus of Elasticity** | 214 GPa (31.0 x 10⁶ psi) | --- #### **5. Mechanical Properties (Typical for Aged Condition)** * **Tensile Strength:** 1240-1380 MPa (180-200 ksi) * **Yield Strength (0.2% Offset):** 1030-1170 MPa (150-170 ksi) * **Elongation:** 8-15% * **Reduction of Area:** 10-20% * **Hardness:** HB 360-420 * **Creep Rupture Strength (540°C/1000°F):** 550 MPa (80 ksi) for 1000 hours --- #### **6. International Standards & Specifications** **General Material Standards:** * **ASTM B637:** Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock * **AMS 5660:** Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings * **AMS 5911:** Nickel Alloy, Corrosion and Heat-Resistant, Sheet, Strip, and Plate **Aerospace Standards:** * **AMS 5661:** Rings and Rolled Ring Blanks * **AMS 5912:** Sheet, Strip, and Plate * **BAC 5617:** Boeing Material Specification **European Standards:** * **UNS:** N09901 * **EN:** NiCr13Mo6Fe6Ti * **DIN:** 2.4662 * **ISO:** 6207 (Nickel alloy bars) --- #### **7. Heat Treatment** **Solution Treatment:** * **Temperature:** 1095-1120°C (2000-2050°F) * **Cooling:** Rapid cooling (water quench or fast air cool) **Aging Treatment:** * **Primary Age:** 775-800°C (1425-1475°F) for 4 hours, air cool * **Secondary Age:** 700-730°C (1290-1350°F) for 24 hours, air cool **Stress Relieving:** * **Temperature:** 650-675°C (1200-1250°F) * **Time:** 2-4 hours --- #### **8. Applications** **Aerospace Industry:** * Gas turbine engine components * Turbine disks and blades * Compressor parts * Jet engine rings and casings **Power Generation:** * Gas turbine components * Steam turbine parts * High-temperature fasteners * Turbine wheels and shafts **Industrial Applications:** * High-temperature bolts and studs * Nuclear reactor components * Chemical processing equipment * Heat treatment fixtures **Automotive Racing:** * Turbocharger components * High-performance engine parts * Exhaust system components --- #### **9. Manufacturing Considerations** **Machining:** * **Condition:** Best machined in annealed condition * **Tools:** Use premium grade carbide tools * **Parameters:** Moderate speeds with heavy feeds * **Coolant:** Ample coolant supply required **Welding:** * **Weldability:** Fair - requires special precautions * **Processes:** GTAW preferred * **Filler Metal:** AWS A5.14 ERNiFeCr-1 or similar * **Post-Weld Heat Treatment:** Required to restore properties **Forging:** * **Temperature Range:** 1050-1175°C (1920-2150°F) * **Preheating:** Required for complex shapes * **Cooling:** Controlled cooling after forging --- #### **10. Quality Assurance** * **Certification:** Full traceability with material certifications * **Testing:** Tensile, hardness, and impact testing * **Non-Destructive Testing:** UT, PT, MT as required * **Microstructural Examination:** Grain size and phase distribution * **Chemical Analysis:** Full composition verification --- **Disclaimer:** This technical information is for reference purposes. For critical applications, always consult the specific material certification and the latest version of the relevant standards. Actual properties may vary depending on manufacturing processes and heat treatment.

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 1949 gallon liquid totes Special package is available on request.