Alloy 825,Incoloy 825 Foil,Shim,UNS N08825,E FORU

British Specs:BS 3072 BS 3073 BS 3074 BS 3075 BS 3076 NA16，American Specs:ASTM B425 ASTM B424 ASTM B163 (Tube *)，German Specs:WS 2.4858

### **Technical Datasheet: Alloy 825 / Incoloy 825 Foil & Shim / UNS N08825** --- #### **1. Overview** **Alloy 825** (commercially known as **Incoloy® 825**) is a nickel-iron-chromium alloy engineered with molybdenum and copper additions for exceptional corrosion resistance in aggressive environments. This datasheet specifically addresses the **Foil** and **Shim** product forms, which are thin-gauge materials used for precision applications requiring excellent corrosion resistance, thermal stability, and specific mechanical properties in confined spaces. The designations **Alloy 825**, **Incoloy 825 Foil/Shim**, and **UNS N08825** refer to thin-strip materials typically supplied in thicknesses ranging from 0.025 mm to 2.0 mm, offering the same corrosion resistance as thicker forms but with enhanced flexibility and formability. --- #### **2. Key Characteristics** * **Excellent Corrosion Resistance:** Maintains performance in both oxidizing and reducing environments * **Superior Acid Resistance:** Exceptional resistance to sulfuric and phosphoric acids * **Excellent Formability:** Can be easily shaped, bent, and formed into complex configurations * **Good Spring Properties:** Suitable for spring applications in corrosive environments * **Consistent Thickness:** Precise dimensional control for critical applications * **Stabilized Against Sensitization:** Titanium addition prevents chromium carbide formation --- #### **3. Chemical Composition (Weight %)** | Element | Minimum (%) | Maximum (%) | Key Function | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | 38.0 | 46.0 | Provides fundamental corrosion resistance | | **Chromium (Cr)** | 19.5 | 23.5 | Confers resistance to oxidizing environments | | **Iron (Fe)** | 22.0 min | Balance | Base element of the alloy | | **Molybdenum (Mo)** | 2.5 | 3.5 | Enhances pitting and crevice corrosion resistance | | **Copper (Cu)** | 1.5 | 3.0 | Provides resistance to reducing acids | | **Titanium (Ti)** | 0.6 | 1.2 | Stabilizes against sensitization | | **Carbon (C)** | - | 0.05 | Kept low to minimize carbide formation | | **Manganese (Mn)** | - | 1.00 | - | | **Sulfur (S)** | - | 0.03 | - | | **Silicon (Si)** | - | 0.05 | - | --- #### **4. Physical Properties (Typical)** | Property | Value | | :--- | :--- | | **Density** | 8.14 g/cm³ (0.294 lb/in³) | | **Melting Range** | 1370 - 1400 °C (2500 - 2550 °F) | | **Specific Heat (20°C)** | 440 J/kg·K | | **Thermal Conductivity** | 10.8 W/m·K (at 100°C) | | **Mean Coefficient of Thermal Expansion** | 14.0 μm/m·K (20 - 100°C) | | **Electrical Resistivity** | 1.12 μΩ·m | | **Modulus of Elasticity** | 196 GPa (28.4 x 10⁶ psi) | --- #### **5. Mechanical Properties (Typical)** | Property | Foil (Annealed) | Shim (Hard Temper) | | :--- | :--- | :--- | | **Tensile Strength** | 520-620 MPa | 790-930 MPa | | **Yield Strength (0.2%)** | 170-240 MPa | 690-830 MPa | | **Elongation** | 35-45% | 5-15% | | **Hardness** | HV 150-180 | HV 250-300 | | **Thickness Range** | 0.025-0.5 mm | 0.05-2.0 mm | --- #### **6. International Standards & Specifications** **Foil & Shim Standards:** * **ASTM B424 / ASME SB424:** Plate, Sheet, and Strip * **ASTM B906:** General Requirements for Flat-Rolled Nickel Alloys * **AMS 5871:** Aerospace Material Specification * **EN 10095:** Heat Resisting Steels and Nickel Alloys **Dimensional Standards:** * **Thickness Range:** 0.025 mm to 2.0 mm * **Width Range:** Up to 600 mm (depending on thickness) * **Tolerance Grades:** Precision tolerance available per ASTM B906 **General Material Standards:** * **UNS:** N08825 * **EN:** 2.4858 (NiCr21Mo) * **DIN:** 2.4858 * **JIS:** NCF 825 --- #### **7. Product Forms & Availability** **Foil Products:** * **Thickness:** 0.025 - 0.2 mm * **Width:** Up to 300 mm * **Condition:** Annealed or hard temper * **Surface Finish:** 2B, BA, or special finishes * **Packaging:** Coils or flat sheets **Shim Products:** * **Thickness:** 0.05 - 2.0 mm * **Width:** Up to 600 mm * **Condition:** Annealed, 1/4 hard, 1/2 hard, full hard * **Forms:** Sheets, strips, or custom-cut shapes * **Special Features:** Perforated, etched, or coated --- #### **8. Applications** **Electrical & Electronic:** * Battery contacts and springs * EMI/RFI shielding * Flexible circuit components * Semiconductor processing fixtures **Industrial Components:** * Gaskets and seals for corrosive service * Diaphragms and bellows * Precision springs * Thermal management components **Aerospace & Defense:** * Shims for alignment and spacing * Vibration damping components * Sensor elements * Cryogenic applications **Chemical Processing:** * Lining for vessels and pipes * Filter elements * Laboratory equipment * Sampling devices **Other Applications:** * Medical device components * Food processing equipment * Pharmaceutical manufacturing * Research and development --- #### **9. Fabrication & Processing** **Forming Operations:** * **Blanking:** Suitable for precision blanking * **Bending:** Excellent bend capability in annealed condition * **Deep Drawing:** Good deep draw characteristics * **Stamping:** Can be stamped into complex shapes **Joining Methods:** * **Welding:** GTAW, resistance welding * **Brazing:** Using nickel-based brazing alloys * **Adhesive Bonding:** Good adhesion properties * **Mechanical Fastening:** Riveting, clinching **Heat Treatment:** * **Solution Annealing:** 900-980°C (1650-1800°F) * **Stress Relieving:** 500-600°C (930-1110°F) * **Annealing Atmosphere:** Hydrogen or vacuum recommended --- #### **10. Quality Assurance** * **Dimensional Control:** Precision thickness monitoring * **Surface Quality:** Visual and microscopic inspection * **Mechanical Testing:** Tensile, hardness, springback tests * **Certification:** Full traceability with material certifications * **Packaging:** Protective packaging to prevent damage --- **Disclaimer:** This technical information is for reference purposes. For critical applications, always consult the specific material certification and the latest version of the relevant standards. Actual properties may vary depending on manufacturing processes and heat treatment.

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 1947 gallon liquid totes Special package is available on request.