Alloy 77，Nilomag 77 Foil，Shim，,E FORU

British Specs:，American Specs: AMS 6519 Bar, Tube, Forging，German Specs:

### **Product Datasheet: Alloy 77 / Nilomag 77 Foil & Shim Stock** **Alloy 77** (also known as **Nilomag 77**) is a premium nickel-chromium-iron alloy renowned for its exceptional resistance to oxidation and carburization at high temperatures. In its ultra-thin forms as **Foil** and **Shim Stock**, this alloy delivers its signature high-temperature performance in applications requiring minimal thickness, precise dimensions, and superior fabricability. These products are engineered for precision sealing, spacing, and shielding in the most demanding thermal environments. This datasheet provides detailed specifications for foil and shim stock, the solution for high-temperature challenges where space and weight are critical constraints. --- #### **1. Chemical Composition (Typical % by Weight)** The composition is meticulously controlled to ensure consistent performance and formability in very thin sections. | Element | Content (%) | | :--- | :--- | | Nickel (Ni) | Balance (~76.0 min) | | Chromium (Cr) | 14.0 - 17.0 | | Iron (Fe) | 6.0 - 10.0 | | Manganese (Mn) | 1.0 max | | Copper (Cu) | 0.20 max | | Silicon (Si) | 0.20 - 0.60 | | Carbon (C) | 0.10 max | | Sulfur (S) | 0.015 max | --- #### **2. Key Physical & Mechanical Properties** Alloy 77 Foil and Shim are supplied in a cold-rolled and annealed condition to achieve optimal softness for conformability and shaping. **Physical Properties:** * **Density:** 8.26 g/cm³ (0.298 lb/in³) * **Melting Range:** ~1371°C - 1427°C (~2500°F - 2600°F) * **Thermal Conductivity:** 12.5 W/m·K (at 100°C) * **Mean Coefficient of Thermal Expansion (20-1000°C):** 16.0 x 10⁻⁶ /K **Mechanical Properties (Annealed Condition):** * **Tensile Strength:** 550 - 690 MPa (80 - 100 ksi) * **Yield Strength (0.2% Offset):** 240 MPa min (35 ksi min) * **Elongation (% in 2 inches):** 30% min * **Hardness (Rockwell B):** 65 - 85 HRB (Softer tempers available for maximum conformability) --- #### **3. Product Applications** The foil and shim forms of Alloy 77 are used in specialized applications that exploit their thinness, resilience, and high-temperature stability. * **High-Temperature Gaskets & Seals:** Custom-cut for furnace doors, viewports, and flanges in oxidizing and carburizing atmospheres. * **Thermal Radiation Shields:** Multiple layers of foil are used to create effective thermal barriers in vacuum and atmosphere furnaces. * **Precision Spacers and Shims:** For setting and maintaining exact gaps in high-temperature assemblies, such as between furnace rollers and their supports. * **Heat Treatment Fixturing:** Used as thin wraps or separators to prevent brazing or diffusion bonding of parts during heat treatment. * **Electronic Component Supports:** Providing insulated, heat-resistant support for components in high-temperature sensors and electronics. --- #### **4. International Standards & Specifications** Alloy 77 Foil and Shim Stock fall under standards for flat-rolled products, with a focus on thin sheet and strip. | Standard | Material Number | UNS Number | Product Form | | :--- | :--- | :--- | :--- | | **ASTM B168 / ASME SB168** | - | **N06003** | Plate, Sheet, and Strip | | **ASTM B906** | - | **N06003** | General Specification for Flat-Rolled Nickel and Nickel Alloys | | **DIN 17742** | **2.4631** | - | Strip (NiCr15Fe) | | **EN 10095** | **NiCr15Fe** (Similar) | - | Heat resisting steels and nickel alloys | *Note: "Foil" is typically defined as material under 0.2mm (0.008") in thickness, while "Shim Stock" refers to material supplied for spacing and filling gaps.* --- #### **5. Key Advantages of Alloy 77 Foil & Shim** * **Exceptional Thin-Gauge Performance:** Retains excellent oxidation resistance and strength even in ultra-thin sections down to thousandths of an inch. * **Outstanding Conformability:** The soft, annealed temper allows the foil/shim to easily conform to irregular surfaces, creating effective seals and fills. * **High-Temperature Integrity:** Will not melt, degrade, or lose its spring-back at continuous operating temperatures up to 1150°C (2100°F), unlike polymer-based alternatives. * **Precision Thickness Control:** Manufactured to tight dimensional tolerances, ensuring consistency and reliability in precision assemblies. * **Excellent Fabricability:** Can be easily sheared, punched, stamped, or wound to create custom gaskets, seals, and shapes. **Conclusion:** Alloy 77 (Nilomag 77) Foil and Shim Stock extend the renowned benefits of this high-performance alloy into the realm of precision thin-gauge materials. They provide an essential, reliable solution for sealing, spacing, and thermal management in extreme environments where other materials would fail, ensuring long-term system integrity and performance. --- **For detailed information on available foil thicknesses, standard shim stock sizes, temper options, and custom slitting services, please contact our technical sales team.**

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 2792 gallon liquid totes Special package is available on request.