Alloy 706，Inconel 706 Tube，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) Tube // UNS N09706** --- #### **Material Overview** Alloy 706 is a precipitation-hardenable nickel-iron-chromium alloy specifically designed for tubular applications requiring high strength, excellent fatigue resistance, and good creep properties up to 1300°F (704°C). The tube form offers superior performance in high-pressure and high-temperature environments, with enhanced machinability compared to other nickel-based superalloys. --- #### **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 | | Specific Heat Capacity (21°C) | 440 J/kg·K | 0.105 Btu/lb·°F | --- #### **Mechanical Properties (Aged Condition)** | Tube Type | Tensile Strength | Yield Strength | Elongation | Hardness | |-----------|------------------|----------------|------------|----------| | Seamless | 1240-1380 MPa | 1035-1170 MPa | 12-20% | 331-375 HB | | Welded | 1200-1350 MPa | 1000-1150 MPa | 10-18% | 321-363 HB | --- #### **International Standards** **ASTM Standards:** - B516 - Welded Nickel-Iron-Chromium Alloy Tubes - B517 - Welded Nickel-Iron-Chromium Alloy Pipe - B751 - Welded and Seamless Nickel-Alloy Tubes **Aerospace Standards:** - AMS 5703 - Bars, Forgings, and Rings - AMS 5704 - Forging Stock **International Equivalents:** - UNS: N09706 - EN: NiCr15Fe7NbTi - DIN: 2.4696 - JIS: NCF 706 --- #### **Product Specifications** **Tube Types:** - **Seamless Tubes**: Hot finished or cold drawn - **Welded Tubes**: Electric resistance welded (ERW) - **Heat Exchanger Tubes**: Condenser and boiler applications - **Hydraulic Tubing**: Precision drawn for fluid systems - **Instrumentation Tubing**: Small diameter, precision tubes **Size Range:** - **Outside Diameter**: 3 mm to 200 mm (1/8" to 8") - **Wall Thickness**: 0.5 mm to 20 mm (0.020" to 0.787") - **Length**: Standard 6-7 meters, cut lengths available **Tolerance Classes:** - Standard tolerance per ASTM B751 - Precision tolerance available - Special dimensional requirements accommodated --- #### **Heat Treatment** **Solution Annealing:** - 1700-1800°F (925-980°C) for 1 hour, rapid cooling **Precipitation Aging:** - 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 in tubular form - **Superior Machinability**: Better machinability than most nickel-based alloys - **Good Weldability**: Can be welded using standard processes - **Thermal Fatigue Resistance**: Excellent resistance to thermal cycling - **Creep Strength**: Good creep rupture strength at elevated temperatures - **Pressure Integrity**: Excellent for high-pressure applications --- #### **Typical Applications** **Aerospace & Defense:** - Aircraft hydraulic systems - Engine fuel and oil lines - Actuator tubing - Environmental control systems - High-pressure air systems **Oil & Gas:** - Downhole instrumentation tubing - Chemical injection lines - Control line tubing - Subsea hydraulic tubing - Wellhead control systems **Power Generation:** - Heat exchanger tubes - Boiler tubes - Steam turbine bypass tubing - Instrumentation and control tubing - Hydraulic control systems **Industrial Equipment:** - Hydraulic cylinder tubing - High-pressure fluid transfer lines - Process instrumentation tubing - Compressor discharge tubing - Heat treatment furnace tubing --- #### **Fabrication & Processing** **Welding:** - **Process**: GTAW (TIG) preferred - **Filler Metal**: AWS A5.14 ERNiFeCr-2 - **Preheat**: 400-600°F (204-316°C) - **Post-Weld Heat Treatment**: Required for optimum properties **Bending & Forming:** - **Cold Bending**: Minimum bend radius 2x OD - **Hot Bending**: 1600-1800°F (871-982°C) - **Flaring**: Standard 37° flaring applicable **Cutting:** - Abrasive cutting with proper technique - Band saw cutting with appropriate blades - Tube cutting machines for precision lengths --- #### **Quality Assurance** **Testing & Inspection:** - Hydrostatic pressure testing - Eddy current testing - Ultrasonic examination - Dimensional verification - Surface quality inspection **Certification:** - Mill Test Certificate 3.1 per EN 10204 - Chemical Analysis Certificate - Mechanical Test Reports - Non-Destructive Testing Reports - Heat Treatment Certificates **Standards Compliance:** - NACE MR0175/ISO 15156 - ASME Boiler and Pressure Vessel Code - PED 2014/68/EU - Customer-specific requirements --- **Note:** *Inconel® is a registered trademark of Special Metals Corporation. All values are typical and may vary based on manufacturing process, heat treatment, and tube dimensions. Consult engineering specifications for critical applications.*

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 1771 gallon liquid totes Special package is available on request.