Alloy 901,Incoloy 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 / Incoloy 901 Fittings / UNS N09901** --- #### **1. Overview** **Alloy 901** (commercially referred to as **Incoloy® 901**) is a nickel-iron-chromium precipitation-hardening superalloy specifically engineered for high-temperature, high-pressure piping applications where conventional materials cannot withstand demanding service conditions. This datasheet focuses on **Fittings** made from this alloy, which are precision-engineered components used in high-temperature piping systems requiring exceptional creep resistance and mechanical strength at temperatures up to 590°C (1100°F). Incoloy 901 Fittings maintain excellent performance under extreme thermal and mechanical stresses, making them ideal for critical applications in aerospace, power generation, and petrochemical industries. --- #### **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 pressure 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 * **Excellent Pressure Containment:** Maintains integrity under high internal pressure --- #### **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 - 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 * **Pressure Rating:** Per ASME B16.34 standards --- #### **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 * **ASTM B637:** Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock * **AMS 5660:** Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings **Pressure Ratings:** * **ASME B16.5:** Pipe Flanges and Flanged Fittings * **ASME B16.34:** Valves - Flanged, Threaded, and Welding End * **ASME B31.3:** Process Piping **International Equivalents:** * **UNS:** N09901 * **EN:** NiCr13Mo6Fe6Ti * **DIN:** 2.4662 * **JIS:** NCF 901 --- #### **7. Types of Fittings Available** **Butt-Weld Fittings:** * **Elbows:** 45°, 90°, 180° (Long & Short Radius) * **Tees:** Straight and Reducing Tees (Equal and Unequal) * **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 * Socket-Weld Unions **Threaded Fittings:** * Threaded Elbows * Threaded Tees * Threaded Couplings * Threaded Crosses * Threaded Bushings **Special Fittings:** * **Returns:** 180° Return Bends * **Lateral Fittings:** Special branch connections * **Nipples:** Close, Hexagonal, and Long Nipples * **Custom Fittings:** Engineered to specific requirements --- #### **8. Applications** **Aerospace Industry:** * Aircraft engine fuel system fittings * High-pressure hydraulic line components * Afterburner fuel system fittings * Thermal management system components * Rocket propulsion system fittings **Power Generation:** * High-pressure steam line fittings * Gas turbine fuel system components * Heat exchanger connections * Superheater and reheater system fittings * Nuclear power plant piping components **Oil & Gas Industry:** * High-pressure wellhead components * Downhole tool connections * Subsea control system fittings * High-temperature process piping * Refinery and petrochemical plant fittings **Industrial Applications:** * High-temperature furnace piping * Nuclear reactor coolant system fittings * Chemical processing equipment * Specialized heat treatment systems * High-temperature test facility piping --- #### **9. Manufacturing & Quality Control** **Manufacturing Processes:** * **Hot Forging:** For superior grain structure and mechanical properties * **Machining:** Precision CNC machining from bar stock or forgings * **Heat Treatment:** Full solution treatment and aging cycle * **Surface Treatment:** Pickling, passivation, and special coatings **Quality Assurance:** * **Material Traceability:** Full certification and traceability from melt to final product * **Dimensional Inspection:** CMM verification and manual checking to ASME standards * **Non-Destructive Testing:** - Liquid Penetrant Testing per ASTM E165 - Magnetic Particle Testing per ASTM E709 - Ultrasonic Testing per ASTM A388 - Radiographic Testing for critical sections * **Pressure Testing:** Hydrostatic and pneumatic testing to required standards * **Documentation:** Certified Mill Test Reports (CMTR) with full traceability --- #### **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) * **Interpass Temperature:** 150-200°C (300-400°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 * **Cleaning:** Proper cleaning to prevent contamination **Maintenance Considerations:** * **Inspection:** Regular visual and NDT inspection for creep damage * **Monitoring:** Temperature and pressure monitoring in service * **Replacement:** Scheduled replacement based on service conditions * **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 1970 gallon liquid totes Special package is available on request.