Alloy 718，Inconel 718 Foil，Shim，UNS N07718，EFORU

British Specs:，American Specs: AMS 5662 Bar and Forgings AMS 5663 Bar and Forgings AMS 5664 Bar and Forgings AMS 5589 Seamless Tube AMS 5590 (Tube *) AMS 5596 Sheet, Strip and Plate AMS 5597 Sheet, Strip and Plate AMS 5832 Welding Wire AMS 5914 Sheet, Strip and Foil AMS 5950 (718SPF) Sheet & Strip ASTM F3055 Powder，German Specs:

### **Product Introduction: Alloy 718 / Inconel 718 Foil & Shim Stock (UNS N07718)** #### **Overview** **Alloy 718 Foil & Shim Stock** (commercially known as **Inconel® 718 Foil & Shim**) represents the thin-gauge form of this premium nickel-chromium superalloy, precision-rolled to exacting thickness tolerances for specialized applications. Supplied in very thin sheets or custom-shaped components, this product form combines the alloy's exceptional high-temperature strength, outstanding corrosion resistance, and excellent mechanical properties with the versatility of thin, formable material. Inconel 718 foil is particularly valued for its ability to be formed and sized in the annealed condition and then precipitation-hardened to achieve high strength and thermal stability in final assemblies. The material's unique combination of properties makes it ideal for precision spacing, thermal management, sealing, and electrical applications in extreme environments where conventional materials would fail. --- #### **Chemical Composition** The chemical composition of Alloy 718 Foil & Shim (UNS N07718) maintains the same rigorous standards as other product forms: | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 50.0 - 55.0 | | **Chromium (Cr)** | 17.0 - 21.0 | | **Iron (Fe)** | Balance | | **Niobium (Nb)** | 4.75 - 5.50 | | **Molybdenum (Mo)** | 2.80 - 3.30 | | **Titanium (Ti)** | 0.65 - 1.15 | | **Aluminum (Al)** | 0.20 - 0.80 | | **Cobalt (Co)** | ≤ 1.00 | | **Carbon (C)** | ≤ 0.08 | | **Manganese (Mn)** | ≤ 0.35 | | **Silicon (Si)** | ≤ 0.35 | | **Sulfur (S)** | ≤ 0.015 | | **Cu (Cu)** | ≤ 0.30 | | **Boron (B)** | ≤ 0.006 | *The precise chemical balance enables effective precipitation hardening through gamma double prime [γ'' Ni₃Nb] phase formation, even in thin foil configurations.* --- #### **Physical Properties** Special considerations for thin foil and shim applications: | Property | Metric Value | Imperial Value | | :--- | :--- | :--- | | **Density** | 8.19 g/cm³ | 0.296 lb/in³ | | **Melting Range** | 1260 - 1336 °C | 2300 - 2440 °F | | **Specific Heat (20°C)** | 435 J/kg·K | 0.104 Btu/lb·°F | | **Thermal Conductivity (20°C)** | 11.4 W/m·K | 79.1 Btu·in/hr·ft²·°F | | **Thermal Expansion Coefficient (20-100°C)** | 13.0 μm/m·°C | 7.2 μin/in·°F | | **Modulus of Elasticity** | 200 GPa | 29.0 x 10⁶ psi | | **Electrical Resistivity** | 1.25 μΩ·m | - | --- #### **Mechanical Properties & Tempers** Properties tailored for thin-gauge applications: **Annealed Condition (Formable):** * **Tensile Strength:** 965-1100 MPa (140-160 ksi) * **Yield Strength:** 550-690 MPa (80-100 ksi) * **Elongation:** 20-30% * **Hardness:** 25-35 HRC **Precipitation Hardened Condition:** * **Tensile Strength:** 1240-1380 MPa (180-200 ksi) * **Yield Strength:** 1030-1170 MPa (150-170 ksi) * **Elongation:** 10-20% * **Hardness:** 35-44 HRC --- #### **International Standards & Specifications** Specialized standards for foil and shim products: **Dimensional Standards:** * **ASTM B906:** General Requirements for Flat-Rolled Nickel and Nickel Alloys * **AMS 5596:** Sheet, Strip, and Plate (for thicknesses down to 0.15mm) * **ASTM B670:** Plate, Sheet, and Strip **Quality Standards:** * **MIL-SPEC-MSRR-7130:** Shim Stock, Metallic * **Customer Specifications:** Often supplied to detailed customer drawings **Thickness Ranges:** * **Foil:** 0.025 - 0.15 mm (0.001 - 0.006 inches) * **Shim Stock:** 0.05 - 1.5 mm (0.002 - 0.060 inches) --- #### **Product Applications** **Aerospace & Defense:** * **Turbine Engine Seals:** Custom-shaped shims for blade tip clearance control * **Thermal Barriers:** Multi-layer foil insulation in engine compartments * **Electrical Shielding:** EMI/RFI shielding in avionics systems * **Gaskets & Seals:** High-temperature static seals for fuel and hydraulic systems **Power Generation:** * **Turbine Clearance Control:** Precision shims for maintaining rotor-stator clearances * **Heat Exchanger Seals:** Thin foil gaskets for high-temperature heat exchangers * **Nuclear Applications:** Specialized shims for reactor components **Electronics & Electrical:** * **Spring Contacts:** High-rel electrical contacts and connectors * **Thermal Management:** Heat spreaders and thermal interface materials * **Battery Components:** Current collectors and interconnects **Industrial Manufacturing:** * **Furnace Components:** Heat treatment fixture shims and spacers * **Precision Instruments:** Calibration shims and spacer stock * **Mold & Die:** Thermal management shims in injection molds **Specialized Applications:** * **Cryogenic Equipment:** Seals and spacers for low-temperature applications * **Medical Devices:** Surgical instrument components and implants * **Research Equipment:** Specialized seals and shielding for laboratory apparatus --- #### **Key Advantages** * **Precision Thickness Control:** Exceptional gauge consistency (±0.0025mm) * **Superior Surface Quality:** Various finishes (2B, BA, polished, matte) * **Excellent Formability:** Can be stamped, blanked, and formed in annealed condition * **High Strength-to-Weight Ratio:** Exceptional strength in minimal cross-sections * **Thermal Stability:** Maintains dimensions and properties during thermal cycling * **Corrosion Resistance:** Excellent performance in oxidizing and reducing atmospheres * **Spring Properties:** Good elastic modulus and springback characteristics * **Weldability:** Can be welded using resistance and laser welding techniques **Processing Capabilities:** * **Slitting:** Precision width control to ±0.025mm * **Blanking:** Custom shapes and profiles * **Heat Treatment:** Precise thermal processing for property optimization * **Surface Treatment:** Passivation, cleaning, and special coatings * **Inspection:** 100% dimensional verification and surface quality control **Note:** *Inconel® is a registered trademark of Special Metals Corporation. Foil and shim products are typically supplied in the annealed condition for optimum formability, with subsequent aging treatment (718°C/1325°F for 8 hours) to develop full mechanical properties. Special handling and storage in controlled environments are recommended to prevent surface damage and contamination. Custom certifications and material traceability are available to meet specific application requirements.*

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 1791 gallon liquid totes Special package is available on request.