Alloy 907,Incoloy 907 Fittings,UNS N19907,E FORU

British Specs:，American Specs:，German Specs:

### **Technical Datasheet: Alloy 907 / Incoloy 907 Fittings / UNS N19907** --- #### **1. Overview** **Alloy 907** (commercially known as **Incoloy® 907**) is a nickel-iron-cobalt-niobium precipitation-hardening superalloy specifically engineered for high-temperature piping applications requiring low thermal expansion characteristics and exceptional mechanical strength. This datasheet focuses on **Fittings** made from this alloy, which are precision-engineered components used in high-temperature piping systems where thermal expansion matching and dimensional stability are critical. Incoloy 907 Fittings maintain excellent performance at temperatures up to 550°C (1020°F), providing reliable service in critical aerospace, power generation, and petrochemical applications. --- #### **2. Key Characteristics** * **Low Thermal Expansion:** Controlled expansion characteristics matching adjacent components * **High Temperature Strength:** Excellent mechanical properties at elevated temperatures * **Outstanding Creep Resistance:** Superior 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 * **Excellent Pressure Containment:** Maintains integrity under high internal pressure --- #### **3. Chemical Composition (Weight %)** | Element | Minimum (%) | Maximum (%) | Key Function | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | 35.0 | 40.0 | Matrix element providing austenitic structure | | **Iron (Fe)** | Balance | - | Base element for cost-effective strengthening | | **Cobalt (Co)** | 12.0 | 16.0 | Enhances high-temperature strength and stability | | **Niobium (Nb)** | 4.3 | 5.2 | Primary precipitation hardening element | | **Titanium (Ti)** | 1.3 | 1.8 | Secondary precipitation hardener | | **Silicon (Si)** | 0.05 | 0.25 | Improves oxidation resistance | | **Aluminum (Al)** | 0.05 | 0.25 | Enhances oxidation resistance | | **Carbon (C)** | 0.01 | 0.05 | Controlled for carbide formation | | **Manganese (Mn)** | - | 0.50 | - | | **Sulfur (S)** | - | 0.015 | - | | **Boron (B)** | 0.003 | 0.012 | Enhances creep strength | --- #### **4. Physical Properties (Typical)** | Property | Metric Value | Imperial Value | | :--- | :--- | :--- | | **Density** | 8.25 g/cm³ | 0.298 lb/in³ | | **Melting Range** | 1360-1410°C | 2480-2570°F | | **Specific Heat (20°C)** | 450 J/kg·K | 0.107 BTU/lb·°F | | **Thermal Conductivity** | 13.5 W/m·K | 78.0 BTU·in/hr·ft²·°F | | **Mean Coefficient of Thermal Expansion (20-400°C)** | 11.5 μm/m·K | 6.4 μin/in·°F | | **Electrical Resistivity** | 1.10 μΩ·m | 662 ohm·circ mil/ft | | **Modulus of Elasticity** | 205 GPa | 29.7×10⁶ psi | --- #### **5. Mechanical Properties (Typical for Aged Condition - Fittings)** * **Tensile Strength:** 1280-1420 MPa (185-206 ksi) * **Yield Strength (0.2% Offset):** 1000-1150 MPa (145-167 ksi) * **Elongation:** 10-18% * **Hardness:** HB 370-420 * **Impact Strength:** 25-40 J (18-30 ft-lb) * **Creep Rupture Strength (540°C/1000°F):** 580 MPa (84 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 * **AMS 5917:** Nickel Alloy, Corrosion and Heat Resistant, Bars, Forgings, and Rings * **ASTM B670:** Precipitation-Hardening Nickel Alloy Plate, Sheet, and Strip **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:** N19907 * **EN:** NiCr15Fe7NbTi * **DIN:** 2.4665 --- #### **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 **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 * Engine bleed air systems * 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 process piping fittings * Downhole tool connections * Subsea control system fittings * Thermal recovery system components * Refinery high-temperature fittings **Industrial Applications:** * High-temperature furnace piping * Nuclear reactor coolant system fittings * Chemical processing equipment * Specialized heat treatment systems * Thermal expansion loop components --- #### **9. Manufacturing & Quality Control** **Manufacturing Processes:** * **Hot Forging:** For superior grain structure and mechanical properties * **Machining:** Precision CNC machining from bar stock or forgings * **Investment Casting:** For complex geometries * **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 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 * **Documentation:** Certified Mill Test Reports (CMTR) --- #### **10. Installation & Maintenance** **Welding Procedures:** * **Weldability:** Good with proper procedures * **Recommended Process:** GTAW (TIG) with pulsed current * **Filler Metal:** AWS A5.14 ERNiFeCr-2 * **Preheat Temperature:** 150-200°C (300-400°F) * **Interpass Temperature:** 120-180°C (250-350°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 * **Thermal Expansion:** Account for thermal movement in system design **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 1983 gallon liquid totes Special package is available on request.