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

British Specs:，American Specs:，German Specs:

### **Technical Datasheet: Alloy 907 / Incoloy 907 Tube / 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 tubular applications requiring low thermal expansion characteristics and exceptional mechanical strength. This datasheet focuses on the **Tube** product form, which is utilized in extreme thermal environments where conventional materials cannot maintain dimensional stability. Incoloy 907 Tube offers outstanding performance at temperatures up to 550°C (1020°F), providing reliable service in critical heat exchanger, instrumentation, and high-temperature fluid handling applications where thermal expansion matching and pressure integrity are paramount. --- #### **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 load * **Excellent Thermal Fatigue Resistance:** Withstands cyclic thermal stresses and thermal shock * **Age-Hardenable:** Develops optimal strength through precipitation hardening treatment * **Good Oxidation Resistance:** Suitable for continuous high-temperature service * **Excellent Heat Transfer Properties:** Ideal for heat exchanger applications * **Superior Pressure Resistance:** 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 - Tube)** * **Tensile Strength:** 1280-1420 MPa (185-206 ksi) * **Yield Strength (0.2% Offset):** 1000-1150 MPa (145-167 ksi) * **Elongation:** 12-20% * **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 * **Collapse Strength:** Varies with diameter-to-thickness ratio --- #### **6. International Standards & Specifications** **Tube Product Standards:** * **ASTM B163:** Standard Specification for Seamless Condenser and Heat-Exchanger Tubes * **ASTM B829:** Standard Specification for Seamless Nickel and Nickel Alloy Pipes and Tubes * **ASME SB163:** Nuclear and high-temperature service applications * **ASTM B751:** General Requirements for Nickel and Nickel Alloy Seamless and Welded Tube **Material Specifications:** * **AMS 5917:** Nickel Alloy, Corrosion and Heat Resistant, Bars, Forgings, and Rings * **ASTM B670:** Standard Specification for Precipitation-Hardening Nickel Alloy Plate, Sheet, and Strip **Dimensional Standards:** * **ASTM B163:** Covers dimensional requirements for condenser tubes * **TEMA Standards:** Heat exchanger tube specifications **International Equivalents:** * **UNS:** N19907 * **EN:** NiCr15Fe7NbTi * **DIN:** 2.4665 * **ISO:** 6207 (Nickel alloy tubes) --- #### **7. Product Specifications & Availability** **Tube Specifications:** * **Outside Diameter:** 3 mm to 100 mm (0.125" to 4") * **Wall Thickness:** 0.5 mm to 8 mm (0.020" to 0.315") * **Length:** Standard 6-7 meters (20-24 feet), custom lengths available * **Tolerance:** OD ±0.1mm, WT ±10% (standard) **Manufacturing Processes:** * **Seamless Tube:** Hot extruded, cold drawn, or pilgered * **Welded Tube:** Available with proper welding and heat treatment * **Finish:** Cold drawn, annealed, or hard **Available Conditions:** * **Solution Annealed:** 980-1010°C (1800-1850°F) * **Solution Treated & Aged:** Fully heat treated ready for service * **Cold Worked:** For specific applications requiring higher strength --- #### **8. Applications** **Heat Exchanger Applications:** * Shell and tube heat exchangers for high-temperature service * Condenser tubes in power generation * Cooler and heater tubes in refinery service * Evaporator and reboller tubes * Aircraft heat exchangers **Aerospace Industry:** * Aircraft engine heat exchanger tubes * Hydraulic and fuel system tubing * Environmental control system components * Thermal management system tubing * Bleed air system tubes **Power Generation:** * High-pressure boiler tubes * Steam generator tubes * Feedwater heater tubes * Superheater and reheater tubes * Nuclear power plant instrumentation tubes **Oil & Gas Industry:** * Downhole instrumentation tubing * Heat exchanger tubing in refineries * Surface condenser tubing * Process heat transfer tubing * Subsea control system tubing --- #### **9. Processing & Fabrication** **Tube Installation:** * **Tube Expansion:** Can be roller expanded into tube sheets * **Bending:** Cold bending with mandrel for tight radii * **Flaring/Flanging:** Possible with proper tooling and annealing * **Welding:** Requires specialized procedures **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) **Heat Treatment:** * **Solution Treatment:** 980-1010°C (1800-1850°F), rapid cooling * **Aging Treatment:** - Primary: 720-745°C (1330-1375°F) for 8 hours, air cool - Secondary: 620-650°C (1150-1200°F) for 8 hours, air cool --- #### **10. Quality Assurance & Testing** **Certification Requirements:** * Full traceability with mill certifications * Certified Mill Test Reports (CMTR) * Heat treatment records * Chemical analysis certificates **Non-Destructive Testing:** * **Eddy Current Testing:** Per ASTM E309 for surface defects * **Ultrasonic Testing:** Per ASTM A388 for internal defects * **Hydrostatic Testing:** Per applicable codes * **Visual Inspection:** Per ASTM A450 **Destructive Testing:** * **Flattening Tests:** Per ASTM A450 requirements * **Flare Tests:** For ductility assessment * **Hardness Surveys:** Multiple points along tube length * **Microstructural Examination:** Grain size and phase distribution **Dimensional Inspection:** * OD, ID, and wall thickness verification * Ovality and straightness checks * Surface finish evaluation * Length verification --- **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 tube 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 1979 gallon liquid totes Special package is available on request.