Alloy 706，Inconel 706 ，UNS N09706，EFORU

British Specs:，American Specs:AMS 5701 Bar and Forgings AMS 5702 Bar and Forgings AMS 5703 Bar and Forgings AMS 5605 Sheet, Strip and Plate AMS 5606 Sheet, Strip and Plate，German Specs:

### **Product Datasheet: Alloy 706 (Inconel® 706) // UNS N09706** --- #### **Material Overview** Alloy 706 is a precipitation-hardenable nickel-iron-chromium alloy with significant additions of niobium and molybdenum. Developed for applications requiring high strength and good manufacturability, this alloy offers excellent mechanical properties combined with improved machinability compared to similar high-performance alloys. Its balanced composition provides good corrosion resistance while maintaining high strength up to 1300°F (704°C). --- #### **Chemical Composition (Weight %)** | Element | Minimum | Maximum | Element | Minimum | Maximum | |---------|---------|---------|---------|---------|---------| | Ni | 39.0 | 44.0 | Fe | 35.0 | 40.0 | | Cr | 14.5 | 17.5 | Nb | 2.5 | 3.3 | | Mo | - | 1.0 | Ti | 1.5 | 2.0 | | Al | 0.1 | 0.4 | C | - | 0.08 | | Mn | - | 0.50 | Si | - | 0.50 | | P | - | 0.03 | S | - | 0.02 | | Cu | - | 0.50 | B | - | 0.02 | --- #### **Physical Properties** | Property | Value (Metric) | Value (Imperial) | |----------|----------------|------------------| | Density | 8.05 g/cm³ | 0.291 lb/in³ | | Melting Range | 1365-1425°C | 2490-2600°F | | Thermal Conductivity (21°C) | 11.2 W/m·K | 7.8 Btu·in/hr·ft²·°F | | Mean Coefficient of Thermal Expansion (21-538°C) | 14.2 μm/m·K | 7.9 x 10⁻⁶ in/in/°F | | Modulus of Elasticity | 206 GPa | 29.9 x 10⁶ psi | | Electrical Resistivity | 1.12 μΩ·m | 44.1 μΩ·in | --- #### **Mechanical Properties (Typical)** | Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (Brinell) | |-----------|------------------------|----------------------|----------------|-------------------| | Annealed | 745 | 345 | 35 | 200 | | Aged (980°C/1h + 720°C/8h + 620°C/8h) | 1240 | 1035 | 15 | 350 | --- #### **International Specifications** **ASTM Standards:** - B637 - Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock **Aerospace Standards:** - AMS 5703 - Bar, Forgings, and Rings - AMS 5704 - Forging Stock **International Equivalents:** - UNS: N09706 - EN: NiCr15Fe7NbTi - DIN: 2.4696 - GB: GH706 --- #### **Heat Treatment** **Solution Treatment:** - 1700-1800°F (925-980°C) followed by rapid cooling **Aging Treatment:** - 1325°F (720°C) for 8 hours, furnace cool to 1150°F (620°C) - Hold at 1150°F (620°C) for 8 hours, air cool --- #### **Key Characteristics** - **High Strength-to-Weight Ratio**: Excellent mechanical properties at elevated temperatures - **Good Machinability**: Superior machinability compared to other precipitation-hardening superalloys - **Precipitation Hardenable**: Can be heat treated to achieve high strength levels - **Good Weldability**: Can be welded using common processes with proper procedures - **Moderate Corrosion Resistance**: Suitable for many industrial environments - **Excellent Creep Strength**: Good resistance to deformation under load at high temperatures --- #### **Typical Applications** **Aerospace & Defense:** - Gas turbine engine components - Compressor disks and shafts - Turbine wheels and spacers - Engine mount components - Afterburner parts **Power Generation:** - Gas turbine disks and blades - Generator retaining rings - Turbine shafts and rotors - High-temperature fasteners **Industrial Equipment:** - High-strength shafts - Pump components - Valve bodies - High-temperature tooling **Oil & Gas:** - Downhole tool components - Wellhead equipment - High-pressure valve parts - Measurement while drilling tools --- #### **Fabrication Notes** **Machining:** - Good machinability in annealed condition - Use positive rake angles and rigid setups - Recommended tools: Carbide or high-speed steel - Use heavy, continuous flow of coolant **Welding:** - Can be welded by TIG, MIG, and resistance methods - Use matching composition filler metal - Post-weld heat treatment recommended - Pre-heat to 400-600°F (204-316°C) **Forging:** - Forging range: 1700-2150°F (927-1177°C) - Use slow, heavy blows during forging - Reheat as necessary to maintain temperature - Anneal after hot working **Cold Working:** - Good ductility in annealed condition - Intermediate annealing may be required - Suitable for moderate cold forming operations --- #### **Corrosion Resistance** - Good resistance to oxidation up to 1300°F (704°C) - Moderate resistance to aqueous corrosion - Good resistance to stress-corrosion cracking - Suitable for mild chemical environments --- #### **Quality Assurance** - Chemical composition certification - Mechanical property testing - Ultrasonic inspection available - Macroetch testing - Grain size verification *Note: Inconel® is a registered trademark of Special Metals Corporation. Properties may vary depending on product form, heat treatment, and processing. Consult technical datasheets for application-specific recommendations.*

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 1767 gallon liquid totes Special package is available on request.