Alloy 706，Inconel 706 Foil，Shim，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 Foil & Shim Stock (UNS N09706)** #### **Overview** **Alloy 706** (commercially known as **Inconel® 706**) foil and shim stock represent the thin-gauge form of this premier precipitation-hardenable nickel-iron-chromium superalloy. Supplied in very thin sheets or rolls, this product form leverages the alloy's exceptional high-temperature strength, oxidation resistance, and low thermal expansion coefficient in applications requiring precision spacing, sealing, and thermal management. Inconel 706 foil is particularly valued for its ability to be formed and sized in a soft condition and then heat-treated to develop high strength and stability in the final assembly. --- #### **Chemical Composition** The chemical composition of Alloy 706 (UNS N09706) foil and shim is consistent with the standard for other forms, 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 | *The unique combination of niobium, titanium, and aluminum allows the foil to be precipitation hardened after fabrication.* --- #### **Physical Properties** These properties are critical for applications involving thermal cycling and electrical requirements. | 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 & Tempers** Foil and shim are typically supplied in the annealed (soft) condition for formability, with the option to be heat-treated after fabrication. **Available Tempers:** * **Annealed (Solution Annealed):** Soft, ductile, and ideal for punching, stamping, and forming into complex shim shapes. * **Age Hardened:** After forming, the component can be heat treated to achieve high strength and rigidity. **Typical Properties after Aging:** * **Tensile Strength:** > 1240 MPa (180 ksi) * **Yield Strength:** > 1030 MPa (150 ksi) * **Hardness:** ≥ 36 HRC --- #### **International Standards & Specifications** While specific standards for 706 foil are less common than for bar or forgings, it is produced to meet precise dimensional and quality tolerances. * **ASTM B906:** Standard Specification for General Requirements for Flat-Rolled Nickel and Nickel Alloys Plate, Sheet, and Strip. This is the overarching specification for dimensional tolerances, testing, and packaging of flat-rolled products. * **AMS 7857:** While primarily for bars and forgings, its chemical and heat treatment requirements are often referenced. * **Customer Specifications:** Foil and shim are frequently produced to detailed customer drawings and proprietary specifications, especially for aerospace and defense applications. **Common Thickness Range:** * **Foil:** Typically 0.025 mm (0.001") up to 0.15 mm (0.006") * **Shim Stock:** Typically 0.05 mm (0.002") up to 1.5 mm (0.060") --- #### **Product Applications** Inconel 706 foil and shim are used in critical, high-precision applications where few other materials can perform: * **Aerospace & Gas Turbine Engines:** * **Turbine Case Seals & Shim Spacers:** Used as custom-shaped shims to set precise clearances between static and rotating parts within the engine's hot section. * **Combustor Seals:** Thin foil seals that contain hot gases within the combustor liner. * **Heat Shields:** Multi-layer foil insulation (MLI) components. * **Precision Instrumentation & Electronics:** * **High-Temperature Sensor Mounting:** Providing stable, non-corrosive platforms for sensors in harsh environments. * **Spring Components:** For relays and connectors requiring high strength and stability at elevated temperatures. * **Industrial Processing:** * **Furnace Gaskets and Seals:** Creating airtight seals in high-temperature vacuum or atmosphere-controlled furnaces. * **Research & Development:** * Used in experimental setups requiring thin, strong, and oxidation-resistant materials. --- #### **Key Advantages** * **High-Temperature Capability:** Maintains strength and resists oxidation continuously up to 700°C (1300°F), far exceeding the capabilities of stainless steels. * **Controlled Thermal Expansion:** Its low coefficient of thermal expansion ensures that shims and seals maintain their dimensions and clamping force during thermal cycles, preventing loosening or over-tightening. * **Excellent Formability in Annealed Condition:** Can be easily punched, stamped, slit, or formed into complex custom shim shapes before the final age-hardening treatment. * **High Strength-to-Weight Ratio:** As a thin foil, it provides immense strength and rigidity with minimal weight and space, which is critical in aerospace design. * **Superior Creep Resistance:** Resists deformation under sustained mechanical stress at high temperatures, ensuring long-term sealing integrity. **Note:** *Inconel® is a registered trademark of Special Metals Corporation, a PCC company. Foil and shim are high-precision products, and users should consult with the manufacturer regarding specific temper, heat treatment schedules, and fabrication techniques.*

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 1778 gallon liquid totes Special package is available on request.