Alloy 901,Incoloy 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 / Incoloy 901 / UNS N09901** --- #### **1. Overview** **Alloy 901** (commercially referred to as **Incoloy® 901**) is a nickel-iron-chromium precipitation-hardening superalloy designed for high-temperature applications requiring exceptional creep resistance and mechanical strength. While commonly associated with the Nimonic series, this alloy is also marketed under the Incoloy brand due to its significant iron content and specific application range. Incoloy 901 maintains excellent mechanical properties at temperatures up to 590°C (1100°F) and offers an optimal balance between high-temperature performance and cost-effectiveness compared to more highly alloyed nickel-base superalloys. --- #### **2. Key Characteristics** * **Excellent High-Temperature Strength:** Maintains mechanical properties at temperatures up to 590°C (1100°F) * **Outstanding Creep Resistance:** Superior creep rupture strength under sustained loading * **Good Thermal Fatigue Resistance:** Excellent resistance to thermal cycling * **Age-Hardenable:** Achieves high strength through precipitation hardening heat treatment * **Good Oxidation Resistance:** Suitable for continuous high-temperature service * **Cost-Effective Performance:** Optimal balance of properties and cost * **Good Fabricability:** Can be machined and formed using standard methods --- #### **3. Chemical Composition (Weight %)** | Element | Minimum (%) | Maximum (%) | Key Function | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | 40.0 | 45.0 | Austenitic matrix base, provides high-temperature stability | | **Chromium (Cr)** | 11.0 | 14.0 | Provides oxidation and corrosion resistance | | **Iron (Fe)** | Balance | - | Base element, provides cost-effective strengthening | | **Molybdenum (Mo)** | 5.0 | 6.5 | Solid solution strengthener, enhances high-temperature strength | | **Titanium (Ti)** | 2.8 | 3.1 | Primary precipitation hardening element (forms γ' phase) | | **Aluminum (Al)** | - | 0.30 | Secondary hardening element | | **Carbon (C)** | 0.10 | 0.20 | Forms carbides for grain boundary strengthening | | **Boron (B)** | 0.01 | 0.02 | Enhances creep strength and ductility | | **Manganese (Mn)** | - | 0.50 | - | | **Silicon (Si)** | - | 0.40 | - | | **Sulfur (S)** | - | 0.015 | - | | **Copper (Cu)** | - | 0.50 | - | --- #### **4. Physical Properties (Typical)** | Property | Metric Value | Imperial 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 | 0.105 BTU/lb·°F | | **Thermal Conductivity** | 12.5 W/m·K | 72.2 BTU·in/hr·ft²·°F | | **Mean Coefficient of Thermal Expansion** | 13.5 μm/m·K | 7.5 μin/in·°F | | **Electrical Resistivity** | 1.18 μΩ·m | 708 ohm·circ mil/ft | | **Modulus of Elasticity** | 214 GPa | 31.0×10⁶ psi | --- #### **5. Mechanical Properties (Typical for Aged Condition)** * **Tensile Strength:** 1200-1380 MPa (174-200 ksi) * **Yield Strength (0.2% Offset):** 1000-1170 MPa (145-170 ksi) * **Elongation:** 10-18% * **Reduction of Area:** 12-20% * **Hardness:** HB 350-410 * **Impact Strength:** 35-55 J (26-41 ft-lb) * **Creep Rupture Strength (540°C/1000°F):** 520-550 MPa (75-80 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 **Product Form Specifications:** * **Bar & Rod:** ASTM B637, AMS 5660 * **Forgings:** ASTM B564, AMS 5660 * **Sheet & Plate:** AMS 5911, ASTM B409 * **Tube & Pipe:** ASTM B163, ASTM B829 **International Equivalents:** * **UNS:** N09901 * **EN:** NiCr13Mo6Fe6Ti * **DIN:** 2.4662 * **JIS:** NCF 901 * **GB:** GH2901 (Chinese equivalent) --- #### **7. Heat Treatment** **Solution Treatment:** * **Temperature:** 1095-1120°C (2000-2050°F) * **Time:** 1-2 hours depending on section size * **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 **Alternative Aging:** * **Single Step Age:** 790-810°C (1450-1490°F) for 8-16 hours (for some applications) --- #### **8. Applications** **Aerospace Industry:** * Gas turbine engine components * Turbine disks and shafts * Compressor rotors and blades * Engine structural components **Power Generation:** * Gas turbine rotor components * Steam turbine blades and disks * High-temperature fasteners and studs * Turbine wheel and shaft components **Oil & Gas Industry:** * Wellhead components * Downhole tool components * High-pressure valve components * Subsea equipment **Industrial Applications:** * High-temperature bolts and studs * Nuclear reactor components * Chemical processing equipment * Heat treatment fixtures and tools **Automotive Racing:** * Turbocharger components * High-performance engine parts * Exhaust system components --- #### **9. Manufacturing Considerations** **Machining:** * **Condition:** Machine in solution-treated condition * **Tool Material:** Premium carbide tools recommended * **Cutting Speed:** 10-20 m/min (30-65 SFM) * **Feed Rate:** 0.1-0.3 mm/rev (0.004-0.012 IPR) * **Coolant:** High-pressure coolant essential **Welding:** * **Weldability:** Fair - requires special precautions * **Recommended Process:** GTAW (TIG) preferred * **Filler Metal:** AWS A5.14 ERNiFeCr-1 * **Preheat Temperature:** 200-300°C (400-570°F) * **Post-Weld Heat Treatment:** Required to restore properties **Forging:** * **Temperature Range:** 1050-1175°C (1920-2150°F) * **Heating Rate:** Controlled to avoid thermal shock * **Soaking Time:** Adequate for complete through-heating * **Cooling:** Controlled cooling after forging --- #### **10. Quality Assurance** **Certification Requirements:** * Full traceability from melt to final product * Certified Mill Test Reports (CMTR) * Heat treatment charts and records * Chemical analysis certificates **Testing Requirements:** * **Chemical Analysis:** Full composition verification * **Mechanical Testing:** Tensile, hardness, impact tests * **Non-Destructive Testing:** UT, PT, MT as specified * **Microstructural Examination:** Grain size, phase distribution **Documentation:** * Material certificates per EN 10204 3.1/3.2 * Process control records * Final inspection reports * Compliance certificates --- **Disclaimer:** This technical information is for reference purposes. For critical applications in aerospace, nuclear, or high-temperature services, always consult the specific material certification and the latest version of applicable standards. Actual properties may vary depending on manufacturing processes, heat treatment, and specific product form.

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 1962 gallon liquid totes Special package is available on request.