Alloy 901,Incoloy 901 Pipe,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 Pipe / UNS N09901** --- #### **1. Overview** **Alloy 901** (commercially referred to as **Incoloy® 901**) is a nickel-iron-chromium precipitation-hardening superalloy specifically designed for high-temperature, high-pressure piping applications where conventional materials cannot withstand demanding service conditions. This datasheet focuses on the **Pipe** product form, which is used in extreme environments requiring exceptional creep resistance, thermal stability, and mechanical strength. Incoloy 901 Pipe maintains excellent performance at temperatures up to 590°C (1100°F) and offers reliable service 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 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 * **Excellent Pressure Containment:** Ideal for high-pressure tubular applications * **Good Fabricability:** Can be welded and formed using appropriate techniques --- #### **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 | 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 - Pipe)** * **Tensile Strength:** 1200-1350 MPa (174-196 ksi) * **Yield Strength (0.2% Offset):** 1000-1150 MPa (145-167 ksi) * **Elongation:** 12-20% * **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 * **Burst Pressure:** Varies with diameter and wall thickness per ASME B31.3 --- #### **6. International Standards & Specifications** **Pipe Product Standards:** * **ASTM B829:** Standard Specification for Seamless Nickel and Nickel Alloy Pipes * **ASTM B423:** Standard Specification for Seamless Nickel Alloy Pipe and Tube * **ASME SB829:** Nuclear and high-temperature service applications * **ASTM B775/B776:** General Requirements for Nickel Alloy Pipe **Dimensional Standards:** * **ASME B36.19M:** Stainless Steel Pipe (dimensional standard applicable) * **ASTM B829:** Covers dimensional requirements for nickel alloy pipes * **ANSI/ASME B36.10M:** Welded and Seamless Wrought Steel Pipe **Material Specifications:** * **ASTM B637:** Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock * **AMS 5660:** Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings **International Equivalents:** * **UNS:** N09901 * **EN:** NiCr13Mo6Fe6Ti * **DIN:** 2.4662 * **JIS:** NCF 901 --- #### **7. Product Specifications & Availability** **Pipe Specifications:** * **Size Range:** 1/8" NPS to 24" NPS (DN6 to DN600) * **Schedule:** SCH 10S to SCH XXS * **Wall Thickness:** Per ASME B36.19M standards * **Length:** Random (16-22 feet) or cut-to-length * **End Finish:** Plain end, beveled end, or threaded **Manufacturing Processes:** * **Seamless Pipe:** Hot extruded or pilgered * **Welded Pipe:** Not typically recommended due to welding challenges * **Heat Treatment:** Full solution and aging treatment available **Available Conditions:** * **Solution Annealed:** 1095-1120°C (2000-2050°F) * **Solution Treated & Aged:** Fully heat treated condition * **Stress Relieved:** For specific applications requiring stress relief --- #### **8. Applications** **Aerospace Industry:** * Aircraft engine fuel and hydraulic lines * High-pressure hydraulic systems * Afterburner fuel manifolds * Thermal management system piping **Power Generation:** * High-pressure steam lines * Gas turbine fuel systems * Heat exchanger piping * Superheater and reheater systems **Oil & Gas Industry:** * High-pressure process piping * Downhole instrumentation conduits * Subsea control systems * Thermal recovery pipelines **Industrial Applications:** * High-temperature furnace piping * Nuclear reactor coolant lines * Chemical processing equipment * Specialized heat treatment systems **Specific Service Applications:** * **High-Pressure Steam:** Up to 1000 psi at 590°C * **Hot Gas Systems:** Exhaust and combustion systems * **Hydraulic Systems:** High-temperature hydraulic lines * **Process Piping:** Chemical and petrochemical applications --- #### **9. Processing & Fabrication** **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 **Fabrication Notes:** * **Cold Bending:** Possible with proper tooling and mandrels * **Hot Forming:** Recommended for tight radius bends * **Flanging and Swaging:** Possible with proper heat treatment * **Machining:** Use carbide tools with positive rake angles **Heat Treatment:** * **Solution Treatment:** 1095-1120°C (2000-2050°F), rapid cooling * **Aging Treatment:** - Primary: 775-800°C (1425-1475°F) for 4 hours, air cool - Secondary: 700-730°C (1290-1350°F) for 24 hours, air cool --- #### **10. Quality Assurance & Testing** **Certification Requirements:** * Full traceability with material certifications * Certified Mill Test Reports (CMTR) * Heat treatment charts and records * Chemical analysis certificates **Non-Destructive Testing:** * **Ultrasonic Testing (UT):** Per ASTM A388 for wall thickness and defects * **Liquid Penetrant Testing (PT):** Per ASTM E165 for surface defects * **Radiographic Testing (RT):** For welded joints per applicable codes * **Eddy Current Testing:** For surface and near-surface defects **Destructive Testing:** * Tensile tests at room and elevated temperatures * Hardness surveys * Flattening tests and flare tests * Microstructural examination **Pressure Testing:** * **Hydrostatic Testing:** Per ASME B31.3 requirements * **Pneumatic Testing:** Where specified by design * **Leak Testing:** For critical service applications --- **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 pipe dimensions.

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 1965 gallon liquid totes Special package is available on request.