Alloy 901,Nimonic 901 Fittings,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 Fittings / UNS N09901** --- #### **1. Overview** **Alloy 901** (commercially known as **Nimonic® 901**) is a nickel-iron-chromium precipitation-hardening superalloy specifically engineered for high-temperature applications requiring exceptional creep resistance and mechanical strength. This datasheet focuses on **Fittings** made from this alloy, which are precision-engineered components used in high-temperature, high-pressure piping systems where conventional materials cannot withstand the demanding service conditions. Nimonic 901 Fittings maintain excellent mechanical properties at temperatures up to 590°C (1100°F) and offer superior performance in critical aerospace, power generation, and petrochemical applications. --- #### **2. Key Characteristics** * **Excellent High-Temperature Strength:** Maintains mechanical integrity at temperatures up to 590°C (1100°F) * **Outstanding Creep Resistance:** Superior long-term creep rupture strength under sustained loading * **Excellent Thermal Fatigue Resistance:** Withstands cyclic thermal stresses and thermal shock * **Age-Hardenable:** Develops high strength through precipitation hardening heat treatment * **Good Oxidation Resistance:** Suitable for continuous high-temperature service * **Precision Manufacturing:** Manufactured to strict dimensional tolerances for reliable performance --- #### **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, contributes to solid solution 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 | 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 - Fittings)** * **Tensile Strength:** 1200-1350 MPa (174-196 ksi) * **Yield Strength (0.2% Offset):** 1000-1150 MPa (145-167 ksi) * **Elongation:** 10-18% * **Hardness:** HB 350-410 * **Impact Strength:** 35-50 J (26-37 ft-lb) * **Creep Rupture Strength (540°C/1000°F):** 520 MPa (75 ksi) for 1000 hours --- #### **6. International Standards & Specifications** **Fittings Standards:** * **ASTM B366:** Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings * **ASME B16.9:** Factory-Made Wrought Buttwelding Fittings * **ASME B16.11:** Forged Steel Fittings, Socket-Welding and Threaded * **ASME B16.28:** Wrought Steel Buttwelding Short Radius Elbows and Returns **Material Specifications:** * **ASTM B564:** Standard Specification for Nickel Alloy Forgings * **AMS 5660:** Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings * **ASTM B637:** Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock **Pressure Ratings:** * **ASME B16.5:** Pipe Flanges and Flanged Fittings * **ASME B16.34:** Valves - Flanged, Threaded, and Welding End **International Equivalents:** * **UNS:** N09901 * **EN:** NiCr13Mo6Fe6Ti * **DIN:** 2.4662 --- #### **7. Types of Fittings Available** **Butt-Weld Fittings:** * **Elbows:** 45°, 90°, 180° (Long & Short Radius) * **Tees:** Straight and Reducing Tees * **Reducers:** Concentric and Eccentric Reducers * **Caps:** Pipe Caps and End Caps * **Stub Ends:** Lap Joint Stub Ends **Socket-Weld Fittings:** * Socket-Weld Elbows (45°, 90°) * Socket-Weld Tees * Socket-Weld Couplings * Socket-Weld Caps **Threaded Fittings:** * Threaded Elbows * Threaded Tees * Threaded Couplings * Threaded Unions **Special Fittings:** * **Crosses:** Four-way connections * **Lateral Fittings:** Special branch connections * **Nipples:** Close, Hexagonal, and Long Nipples * **Returns:** 180° Return Bends --- #### **8. Applications** **Aerospace Industry:** * Aircraft engine fuel system fittings * High-pressure hydraulic line components * Afterburner fuel system fittings * Thermal management system components **Power Generation:** * High-pressure steam line fittings * Gas turbine fuel system components * Heat exchanger connections * Supercritical boiler system fittings **Oil & Gas Industry:** * High-pressure wellhead components * Downhole tool connections * Subsea control system fittings * High-temperature process piping **Industrial Applications:** * High-temperature furnace piping * Nuclear reactor coolant system fittings * Chemical processing equipment * Specialized heat treatment systems --- #### **9. Manufacturing & Quality Control** **Manufacturing Processes:** * **Hot Forging:** For complex shapes and superior grain structure * **Machining:** Precision CNC machining from bar stock * **Heat Treatment:** Full solution treatment and aging cycle * **Surface Treatment:** Pickling, passivation, and special coatings **Quality Assurance:** * **Material Traceability:** Full certification and traceability * **Dimensional Inspection:** CMM verification and manual checking * **Non-Destructive Testing:** - Liquid Penetrant Testing per ASTM E165 - Magnetic Particle Testing per ASTM E709 - Ultrasonic Testing per ASTM A388 * **Pressure Testing:** Hydrostatic and pneumatic testing * **Documentation:** Certified Mill Test Reports (CMTR) --- #### **10. Installation & Maintenance** **Welding Procedures:** * **Weldability:** Fair - requires special procedures and precautions * **Recommended Process:** GTAW (TIG) with pulsed current * **Filler Metal:** AWS A5.14 ERNiFeCr-1 * **Preheat Temperature:** 200-300°C (400-570°F) * **Post-Weld Heat Treatment:** Required to restore properties **Installation Guidelines:** * **Alignment:** Proper alignment to avoid stress concentration * **Support:** Adequate piping support to prevent excessive loading * **Gasketing:** High-temperature gasket materials required * **Bolting:** Matching high-temperature bolting materials **Maintenance Considerations:** * **Inspection:** Regular visual and NDT inspection * **Cleaning:** Avoid chloride-containing cleaning agents * **Replacement:** Monitor for creep damage and thermal fatigue * **Documentation:** Maintain installation and maintenance records --- **Disclaimer:** This technical information is for reference purposes. For critical applications in aerospace, nuclear, or pressure-containing services, always consult the specific material certification and the latest version of applicable standards and codes. Actual properties may vary depending on manufacturing processes, heat treatment, and specific fitting design.

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 1957 gallon liquid totes Special package is available on request.