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

British Specs:，American Specs:，German Specs:

### **Technical Datasheet: Alloy 907 / Incoloy 907 Pipe / UNS N19907** --- #### **1. Overview** **Alloy 907** (commercially known as **Incoloy® 907**) is a nickel-iron-cobalt-niobium precipitation-hardening superalloy specifically designed for high-temperature piping applications requiring low thermal expansion characteristics and exceptional mechanical strength. This datasheet focuses on the **Pipe** product form, which is utilized in extreme thermal environments where conventional materials cannot maintain dimensional stability. Incoloy 907 Pipe offers outstanding performance at temperatures up to 550°C (1020°F), providing reliable service in critical aerospace, power generation, and petrochemical applications where thermal expansion matching and pressure containment are crucial. --- #### **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 * **Excellent Pressure Containment:** Maintains integrity under high internal pressure * **Dimensional Stability:** Preserves precise dimensions under thermal cycling conditions --- #### **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 - Pipe)** * **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 * **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 **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:** * **ASME B36.19M:** Stainless Steel Pipe (dimensional standard applicable) * **ASTM B829:** Covers dimensional requirements for nickel alloy pipes **International Equivalents:** * **UNS:** N19907 * **EN:** NiCr15Fe7NbTi * **DIN:** 2.4665 * **ISO:** 6207 (Nickel alloy pipes) --- #### **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:** Available with proper welding and heat treatment procedures * **Heat Treatment:** Full solution and aging treatment available **Available Conditions:** * **Solution Annealed:** 980-1010°C (1800-1850°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 * Engine bleed air systems * Thermal management system piping * Rocket propulsion system feed lines **Power Generation:** * High-pressure steam lines * Gas turbine fuel systems * Heat exchanger piping * Superheater and reheater systems * Nuclear power plant instrumentation lines **Oil & Gas Industry:** * High-pressure process piping * Downhole instrumentation conduits * Subsea control systems * Thermal recovery pipelines * Refinery high-temperature piping **Industrial Applications:** * High-temperature furnace piping * Nuclear reactor coolant lines * Chemical processing equipment * Specialized heat treatment systems * Thermal expansion loop piping --- #### **9. Processing & Fabrication** **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 **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:** 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 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 1978 gallon liquid totes Special package is available on request.