Alloy 706，Inconel 706 Other/Similar Specs，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 Introduction: Alloy 706 / Inconel 706 (UNS N09706) - Bar, Wire, Plate, Sheet & Other Forms** #### **Overview** **Alloy 706** (commercially known as **Inconel® 706**) is a versatile, precipitation-hardenable nickel-iron-chromium superalloy. While renowned for its use in forgings, it is also extensively produced in other forms such as bar, wire, plate, sheet, and ring-rolled products. Its key characteristics include an excellent combination of high strength, good fabricability, and resistance to oxidation and corrosion up to approximately 700°C (1300°F). A significant feature is its lower thermal expansion coefficient compared to Alloy 718, coupled with superior machinability in the solution-annealed condition, making it a cost-effective choice for many high-performance applications. --- #### **Chemical Composition** The standard chemical composition for Alloy 706 (UNS N09706) across all product forms is consistent, ensuring uniform performance. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 39.0 - 44.0 | | **Chromium (Cr)** | 14.5 - 17.5 | | **Iron (Fe)** | Balance | | **Niobium (Nb)** | 2.5 - 3.3 | | **Titanium (Ti)** | 1.5 - 2.0 | | **Molybdenum (Mo)** | ≤ 0.30 | | **Aluminum (Al)** | 0.20 - 0.40 | | **Carbon (C)** | ≤ 0.08 | | **Manganese (Mn)** | ≤ 0.35 | | **Silicon (Si)** | ≤ 0.35 | | **Sulfur (S)** | ≤ 0.015 | | **Copper (Cu)** | ≤ 0.30 | | **Boron (B)** | 0.003 - 0.01 | *Strengthening is achieved through the precipitation of gamma prime [γ' Ni₃(Al, Ti)] and gamma double prime [γ'' Ni₃Nb] phases during aging heat treatment.* --- #### **Physical Properties** The physical properties are fundamental for design and application engineering across all product forms. | Property | Metric Value | Imperial Value | | :--- | :--- | :--- | | **Density** | 8.05 g/cm³ | 0.291 lb/in³ | | **Melting Range** | 1370 - 1430 °C | 2500 - 2600 °F | | **Specific Heat (20°C)** | 450 J/kg·K | 0.108 Btu/lb·°F | | **Thermal Conductivity (20°C)** | 12.5 W/m·K | 86.7 Btu·in/hr·ft²·°F | | **Thermal Expansion Coefficient (20-100°C)** | 12.8 μm/m·°C | 7.1 μin/in·°F | | **Modulus of Elasticity** | 204 GPa | 29.5 x 10⁶ psi | --- #### **Mechanical Properties (Typical for Aged Condition)** Mechanical properties are developed through a solution annealing and aging heat treatment and are applicable to bar, plate, and other wrought forms. **Condition: Solution Annealed + Aged** * **Ultimate Tensile Strength:** ≥ 1240 MPa (180 ksi) * **Yield Strength (0.2% Offset):** ≥ 1030 MPa (150 ksi) * **Elongation:** ≥ 12% * **Hardness:** ≥ 36 HRC --- #### **International Standards & Product Forms** Alloy 706 is covered by a range of international standards specific to its form. The "Other/Similar Specs" category includes: * **Bar, Rod, and Wire:** * **ASTM B805:** Standard Specification for Precipitation Hardening Nickel Alloy Bars, Forgings, and Forging Stock. * **AMS 7857:** Bars, Forgings, and Rings. * **DIN 17752:** Wrought Nickel and Nickel Alloys - Technical Delivery Conditions for Bars. * **Plate, Sheet, and Strip:** * **ASTM B904:** Standard Specification for Cold-Rolled Nickel and Nickel Alloy Strip for Springs. (Applicable for strip forms). * *Note: Specific ASTM specs for 706 plate/sheet are less common than for bar/forgings; material is often supplied to customer-specific drawings or AMS specifications.* * **Forgings and Rings:** * **AMS 7857** (as mentioned). * **ASTM B805** (as mentioned). * **General Material & Testing:** * **ASTM E606:** Standard Practice for Strain-Controlled Fatigue Testing. * **ASTM A388:** Standard Practice for Ultrasonic Examination of Heavy Steel Forgings. --- #### **Product Applications by Form** The application of Alloy 706 depends heavily on its product form: * **Bar Stock:** * Used for machining into bolts, studs, fasteners, valve components, and pump shafts in the oil & gas and power generation industries. * Base material for subsequent forging. * **Wire and Wire Rod:** * Used for welding wire to join Alloy 706 components. * Manufacture of high-strength springs and fasteners for elevated temperature service. * **Plate, Sheet, and Strip:** * Fabricated into combustion liners, turbine seals, and other static structural components in gas turbines. * Sheet forms can be used for formed housings and casings. * **Rings (Rolled or Forged):** * Critical for compressor casings, turbine casings, and flanges in aerospace engines and land-based turbines. --- #### **Key Advantages & distinctions from Alloy 718** * **Excellent Machinability:** Alloy 706 is notably more machinable than Alloy 718 in the solution-annealed condition, leading to reduced tool wear and lower manufacturing costs. * **Lower Thermal Expansion:** Provides superior dimensional stability in thermally cyclic environments, a critical factor for maintaining tight clearances in rotating machinery. * **Cost-Effectiveness:** Historically, it has been a more economical option than Alloy 718, particularly for large components, while still offering high strength. * **High Strength & Creep Resistance:** Maintains excellent mechanical properties at temperatures up to ~650°C (1200°F), suitable for a wide range of high-stress applications. * **Good Weldability:** Can be welded using common methods, though post-weld heat treatment is required to restore full properties in the heat-affected zone. **Note:** *Inconel® is a registered trademark of Special Metals Corporation, a PCC company. While Alloy 706 shares similarities with Alloy 718, its specific properties make it uniquely suited for certain applications. Engineers should evaluate the specific requirements of temperature, stress, and fabrication needs when selecting between them.*

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 1777 gallon liquid totes Special package is available on request.