Alloy 907,Incoloy 907 ,UNS N19907,E FORU

British Specs:，American Specs:，German Specs:

### **Technical Datasheet: Alloy 907 / Incoloy 907 / UNS N19907** --- #### **1. Overview** **Alloy 907** (commercially known as **Incoloy® 907**) is a nickel-iron-cobalt-niobium precipitation-hardening superalloy specifically designed for applications requiring low thermal expansion and high strength at elevated temperatures. This controlled thermal expansion superalloy maintains excellent mechanical properties and dimensional stability at temperatures up to 550°C (1020°F), making it particularly suitable for gas turbine engine components where close clearance control is critical. --- #### **2. Key Characteristics** * **Low Thermal Expansion:** Controlled expansion characteristics matching engine components * **High Temperature Strength:** Excellent mechanical properties at elevated temperatures * **Outstanding Creep Resistance:** Superior creep rupture strength under sustained loading * **Good Thermal Fatigue Resistance:** Excellent resistance to thermal cycling * **Age-Hardenable:** Achieves optimal strength through precipitation hardening * **Good Oxidation Resistance:** Suitable for continuous high-temperature service * **Dimensional Stability:** Maintains precise dimensions under thermal cycling --- #### **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)** * **Tensile Strength:** 1310-1450 MPa (190-210 ksi) * **Yield Strength (0.2% Offset):** 1030-1170 MPa (150-170 ksi) * **Elongation:** 8-15% * **Reduction of Area:** 12-20% * **Hardness:** HB 380-430 * **Impact Strength:** 25-40 J (18-30 ft-lb) * **Creep Rupture Strength (540°C/1000°F):** 580 MPa (84 ksi) for 1000 hours --- #### **6. International Standards & Specifications** **Primary Standards:** * **AMS 5916:** Nickel Alloy, Corrosion and Heat Resistant, Sheet, Strip, and Plate * **ASTM B670:** Standard Specification for Precipitation-Hardening Nickel Alloy Plate, Sheet, and Strip * **AMS 5917:** Nickel Alloy, Corrosion and Heat Resistant, Bars, Forgings, and Rings **Aerospace Standards:** * **GE S400:** Gas Turbine Engine Specifications * **Pratt & Whitney:** Material Specifications * **Rolls-Royce:** RPS 500 Series **International Equivalents:** * **UNS:** N19907 * **EN:** NiCr15Fe7NbTi * **DIN:** 2.4665 * **ISO:** 6207 (Nickel alloy plate, sheet, strip) --- #### **7. Heat Treatment** **Solution Treatment:** * **Temperature:** 980-1010°C (1800-1850°F) * **Time:** 1-2 hours depending on section size * **Cooling:** Rapid air cooling or oil quenching **Aging Treatment:** * **Primary Age:** 720-745°C (1330-1375°F) for 8 hours, air cool * **Secondary Age:** 620-650°C (1150-1200°F) for 8 hours, air cool **Alternative Aging:** * **Single Step Age:** 730-760°C (1350-1400°F) for 16 hours for some applications --- #### **8. Applications** **Aerospace Industry:** * Gas turbine engine casings and seals * Turbine shrouds and rings * Compressor cases * Exhaust system components * Engine mount components **Power Generation:** * Gas turbine casing components * Steam turbine seals * High-temperature fasteners * Power generation turbine components **Industrial Applications:** * High-temperature furnace components * Heat treatment fixtures * Chemical processing equipment * Nuclear reactor components **Specific Component Applications:** * **Turbine Shrouds:** Maintaining close clearance control * **Engine Casings:** Dimensional stability under thermal cycling * **Seal Rings:** High-temperature sealing applications * **Structural Components:** High-temperature frame elements --- #### **9. Manufacturing Considerations** **Machining:** * **Condition:** Machine in solution-treated condition * **Tool Material:** Premium carbide tools recommended * **Cutting Speed:** 8-15 m/min (25-50 SFM) * **Feed Rate:** 0.1-0.2 mm/rev (0.004-0.008 IPR) * **Coolant:** High-pressure coolant essential **Welding:** * **Weldability:** Good with proper procedures * **Recommended Process:** GTAW preferred * **Filler Metal:** AWS A5.14 ERNiFeCr-2 or matching composition * **Preheat Temperature:** 150-200°C (300-400°F) * **Post-Weld Heat Treatment:** Required to restore properties **Forging:** * **Temperature Range:** 1050-1150°C (1920-2100°F) * **Heating Rate:** Controlled to avoid thermal shock * **Soaking Time:** Adequate for complete through-heating * **Cooling:** Controlled cooling after forging --- #### **10. Quality Assurance** **Certification Requirements:** * Full traceability from melt to final product * Certified Mill Test Reports (CMTR) * Heat treatment charts and records * Chemical analysis certificates **Testing Requirements:** * **Chemical Analysis:** Full composition verification * **Mechanical Testing:** Tensile, hardness, impact tests * **Non-Destructive Testing:** UT, PT, MT as specified * **Microstructural Examination:** Grain size, phase distribution * **Thermal Expansion Testing:** For critical applications **Documentation:** * Material certificates per EN 10204 3.1/3.2 * Process control records * Final inspection reports * Compliance certificates --- **Disclaimer:** This technical information is for reference purposes. For critical applications in aerospace, nuclear, or high-temperature services, always consult the specific material certification and the latest version of applicable standards. 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 1975 gallon liquid totes Special package is available on request.