Alloy 706，Inconel 706 Forgings，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 Forgings (UNS N09706)** #### **Overview** **Alloy 706** (commonly known as **Inconel® 706**) is a precipitation-hardenable nickel-iron-chromium superalloy specifically engineered for high-strength applications at elevated temperatures. **Forging** is a primary manufacturing process for this alloy, as it refines the grain structure, enhances mechanical properties, and ensures integrity in critical components. Inconel 706 forgings offer an exceptional combination of high tensile, creep, and rupture strength, excellent fabricability, and good resistance to oxidation and corrosion. A distinct advantage over similar alloys like Alloy 718 is its lower thermal expansion coefficient, making it ideal for applications requiring dimensional stability under thermal cycling. --- #### **Chemical Composition** The typical chemical composition of Alloy 706 (UNS N09706) forgings is standardized as follows: | 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 | *The high strength of forged and heat-treated Alloy 706 is derived from the precipitation of gamma prime [γ' Ni₃(Al, Ti)] and gamma double prime [γ'' Ni₃Nb] phases.* --- #### **Physical Properties** These properties are critical for designing components that will operate in high-temperature environments. | 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 Forgings after Heat Treatment)** Forgings are typically supplied in the solution annealed and precipitation aged condition to achieve optimal properties. **Condition: Solution Annealed + Aged** * **Ultimate Tensile Strength:** ≥ 1240 MPa (180 ksi) * **Yield Strength (0.2% Offset):** ≥ 1030 MPa (150 ksi) * **Elongation:** ≥ 12% * **Reduction of Area:** ≥ 15% * **Hardness:** ≥ 36 HRC --- #### **International Standards for Forgings** Inconel 706 forgings are produced in accordance with stringent international standards that govern their chemical, mechanical, and quality requirements. * **Material & Process Standards:** * **AMS 7857:** Aerospace Material Specification for Bars, Forgings, and Rings. This is a key specification for aerospace components. * **ASTM B805:** Standard Specification for Precipitation Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service. * **ASTM B637:** Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service (may be superseded or used in conjunction). * **Quality & Testing Standards:** * Forgings are often supplied with supplementary testing as per customer requirements, such as ultrasonic testing (ASTM A388), grain size testing, and macro-etch testing to ensure internal soundness. --- #### **Product Applications** **Inconel 706 Forgings** are selected for the most demanding applications across several high-performance industries: * **Aerospace & Gas Turbine Engines:** This is the primary application. Forgings are used for critical rotating and static components such as: * Turbine discs (rotors) * Shafts * Spacers * Compressor casings * Blade retainers * **Oil & Gas (Downhole):** * Wellhead components * Hanger systems * Subsurface safety valve bodies * Tool joints for deep well drilling * **Power Generation:** * Turbine wheels and blades for advanced steam turbines * Components in nuclear reactors * **High-Temperature Fasteners:** Large, high-strength bolts and studs are often forged from Alloy 706. --- #### **Key Advantages of Forged Alloy 706** * **Superior Structural Integrity:** The forging process aligns the grain flow with the shape of the part, eliminating porosity and creating a continuous structure that offers superior mechanical properties and fatigue resistance. * **High Strength-to-Weight Ratio:** Essential for rotating aerospace components where weight savings directly impact efficiency. * **Excellent Creep & Rupture Strength:** Maintains load-bearing capability under stress at temperatures up to approximately 650°C (1200°F). * **Good Machinability:** In the solution-annealed condition, it can be machined more readily than many other high-temperature superalloys, allowing for precise final shaping of forged pre-forms. * **Dimensional Stability:** The low coefficient of thermal expansion minimizes size changes during temperature fluctuations, critical for maintaining tight tolerances in engines. **Note:** *Inconel® is a registered trademark of Special Metals Corporation, a PCC company. The properties listed are typical and should be verified for specific design requirements. The final heat treatment and testing of forgings are critical and must be specified based on the end-use application.*

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 1776 gallon liquid totes Special package is available on request.