Alloy 907,Incoloy 907 Bar(Round bar, Flat bar),UNS N19907,E FORU

British Specs:，American Specs:，German Specs:

### **Technical Datasheet: Alloy 907 / Incoloy 907 Bar (Round Bar & Flat Bar) / UNS N19907** --- #### **1. Overview** **Alloy 907** (commercially known as **Incoloy® 907**) is a nickel-iron-cobalt-niobium precipitation-hardening superalloy specifically engineered for applications requiring low thermal expansion and high strength at elevated temperatures. This datasheet addresses **Round Bar** and **Flat Bar** product forms, which serve as fundamental stock materials for machining high-temperature components where close clearance control and dimensional stability are critical. These product forms offer excellent machinability in the solution-treated condition and develop superior mechanical properties through subsequent aging treatment, maintaining performance at temperatures up to 550°C (1020°F). --- #### **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 heat treatment * **Good Machinability:** Can be precision machined in solution-treated condition * **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)** **Round Bar Properties:** * **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 **Flat Bar Properties:** * **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 --- #### **6. International Standards & Specifications** **Primary Standards:** * **AMS 5917:** Nickel Alloy, Corrosion and Heat Resistant, Bars, Forgings, and Rings * **ASTM B637:** Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock * **ASTM B670:** Standard Specification for Precipitation-Hardening Nickel Alloy Plate, Sheet, and Strip **Product-Specific Standards:** * **Round Bar:** AMS 5917, ASTM B637 * **Flat Bar:** AMS 5916, ASTM B670 **International Equivalents:** * **UNS:** N19907 * **EN:** NiCr15Fe7NbTi * **DIN:** 2.4665 * **ISO:** 6207 (Nickel alloy bars) --- #### **7. Product Specifications & Availability** **Round Bar:** * **Diameter Range:** 5 mm to 250 mm (0.2" to 10") * **Length:** 3-6 meters (10-20 feet), custom lengths available * **Tolerance:** h9, h11, or per customer requirements * **Straightness:** 1 mm per meter maximum **Flat Bar:** * **Thickness:** 5 mm to 100 mm (0.2" to 4") * **Width:** 20 mm to 300 mm (0.8" to 12") * **Length:** 2-6 meters (6-20 feet) * **Edge Condition:** As-rolled, machined, or ground **Available Conditions:** * **Solution Treated:** Optimal for machining (980-1010°C) * **Solution Treated & Aged:** Ready for service * **Hot Worked:** As-forged or as-rolled condition * **Cold Finished:** Improved surface finish and tolerance --- #### **8. Applications** **Aerospace Industry:** * Gas turbine engine components * Turbine disks and shafts * Compressor rotors and blades * Engine structural components * Aircraft mounting brackets **Power Generation:** * Gas turbine rotor components * Steam turbine blades and disks * High-temperature fasteners and studs * Turbine wheel and shaft components **Industrial Applications:** * High-temperature bolts and fasteners * Nuclear reactor components * Chemical processing equipment * Heat treatment fixtures and tools * Precision instrument components **Specific Component Applications:** * **Round Bar:** Shafts, rotors, spindles, fasteners, axles * **Flat Bar:** Structural supports, brackets, blades, seals, wear strips --- #### **9. Processing & Fabrication** **Machining Guidelines:** * **Condition:** Machine in solution-treated condition * **Tool Material:** Premium carbide tools recommended * **Cutting Speed:** 8-15 m/min (25-50 SFM) * **Feed Rate:** 0.1-0.3 mm/rev (0.004-0.012 IPR) * **Depth of Cut:** 1-4 mm (0.040-0.160 inches) * **Coolant:** High-pressure coolant essential **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 * **Stress Relieving:** 600-630°C (1110-1170°F) for 2-4 hours **Welding Considerations:** * **Weldability:** Good with proper procedures * **Recommended Process:** GTAW (TIG) preferred * **Filler Metal:** AWS A5.14 ERNiFeCr-2 * **Preheat Temperature:** 150-200°C (300-400°F) * **Post-Weld Heat Treatment:** Required to restore properties --- #### **10. Quality Assurance** **Material Certification:** * 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 **Dimensional Inspection:** * **Round Bar:** Diameter, straightness, surface quality * **Flat Bar:** Thickness, width, flatness, edge condition * **Surface Quality:** Visual and microscopic inspection * **Documentation:** Compliance certificates and test reports --- **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 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 1977 gallon liquid totes Special package is available on request.