Alloy 901,Nimonic 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 / Nimonic 901 Pipe / UNS N09901** --- #### **1. Overview** **Alloy 901** (commercially known as **Nimonic® 901**) is a nickel-iron-chromium precipitation-hardening superalloy specifically designed for high-temperature applications requiring exceptional creep resistance and mechanical strength. This datasheet focuses on the **Pipe** product form, which is used in high-temperature, high-pressure applications where conventional materials cannot withstand the demanding service conditions. Nimonic 901 Pipe offers excellent resistance to creep, thermal fatigue, and oxidation at temperatures up to 590°C (1100°F), making it ideal for critical piping systems 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 loading * **Good Thermal Fatigue Resistance:** Withstands cyclic thermal stresses * **Age-Hardenable:** Develops high strength through precipitation hardening heat treatment * **Good Oxidation Resistance:** Suitable for continuous high-temperature service * **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 former, provides base strength and 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 (γ' former) | | **Aluminum (Al)** | - | 0.30 | Secondary hardening element | | **Carbon (C)** | 0.10 | 0.20 | Carbide former 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 - Pipe)** * **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 * **Creep Rupture Strength (540°C/1000°F):** 520 MPa (75 ksi) for 1000 hours --- #### **6. International Standards & Specifications** **Pipe Product Standards:** * **ASTM B829:** Standard Specification for Seamless Nickel and Nickel Alloy Pipes * **ASTM B775/B776:** General Requirements for Nickel Alloy Pipe * **ASME SB829:** Nuclear and high-temperature service applications **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 **Dimensional Standards:** * **ASME B36.19M:** Stainless Steel Pipe (dimensional standard applicable) * **ASTM B829:** Covers dimensional requirements for nickel alloy pipes **International Equivalents:** * **UNS:** N09901 * **EN:** NiCr13Mo6Fe6Ti * **DIN:** 2.4662 --- #### **7. Product Specifications & Availability** **Pipe Specifications:** * **Size Range:** 1/8" NPS to 24" NPS (DN6 to DN600) * **Schedule:** SCH 10S to SCH XXS * **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 **Available Conditions:** * **Solution Annealed:** 1095-1120°C (2000-2050°F) * **Solution Treated & Aged:** Fully heat treated condition * **Stress Relieved:** For specific applications --- #### **8. Applications** **Aerospace Industry:** * High-temperature hydraulic lines * Engine feed lines and manifolds * Afterburner fuel lines * Thermal management system piping **Power Generation:** * High-pressure steam lines * Gas turbine fuel lines * Heat exchanger tubing * Superheater and reheater piping **Petrochemical Industry:** * High-temperature process piping * Catalyst transfer lines * Reformers and cracker unit piping * High-pressure hydrogen service **Special Applications:** * Nuclear reactor components * Rocket motor feed systems * High-temperature test facilities * Specialized heat treatment systems --- #### **9. Processing & Fabrication** **Welding Procedures:** * **Weldability:** Fair - requires special precautions * **Recommended Process:** GTAW (TIG) * **Filler Metal:** AWS A5.14 ERNiFeCr-1 or matching composition * **Preheat:** 200-300°C (400-570°F) * **Post-Weld Heat Treatment:** Required to restore properties **Heat Treatment:** * **Solution Treatment:** 1095-1120°C (2000-2050°F), rapid cool * **Aging Treatment:** - Primary Age: 775-800°C (1425-1475°F) for 4 hours - Secondary Age: 700-730°C (1290-1350°F) for 24 hours **Fabrication Notes:** * **Cold Bending:** Possible with proper tooling * **Hot Forming:** Recommended for tight bends * **Machining:** Use carbide tools with positive rake angles * **Cleaning:** Avoid chloride-containing solutions --- #### **10. Quality Assurance & Testing** * **Certification:** Full traceability with material certifications * **Non-Destructive Testing:** - Ultrasonic Testing (UT) per ASTM A388 - Liquid Penetrant Testing (PT) per ASTM E165 - Radiographic Testing (RT) for welded joints * **Destructive Testing:** - Tensile tests at room and elevated temperatures - Hardness surveys - Microstructural examination * **Pressure Testing:** - Hydrostatic testing per applicable codes - Pneumatic testing where specified --- **Disclaimer:** This technical information is for reference purposes. For critical applications, particularly in nuclear, aerospace, or pressure-containing services, always consult the specific material certification and the latest version of the relevant standards and codes. 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 1952 gallon liquid totes Special package is available on request.