Alloy 903,Incoloy 903 Foil,Shim,,E FORU

British Specs:，American Specs:，German Specs:

**Product Introduction: Alloy 903 / Incoloy 903 Foil & Shim (UNS N19903)** **Overview** Incoloy 903 foil and shim represent the ultra-thin product forms of this premium low thermal expansion superalloy, precision-rolled to exacting thickness tolerances for specialized applications requiring exceptional dimensional stability under thermal cycling conditions. The foil (typically <0.1mm) and shim (0.1-1.0mm) forms maintain the alloy's characteristic controlled thermal expansion while offering flexibility and precise dimensional control for critical sealing, spacing, and thermal management applications. **Key Characteristics** * **Ultra-Thin Gauge with Tight Thickness Tolerance** * **Maintains Low Coefficient of Thermal Expansion** * **Excellent Surface Quality and Flatness** * **Good Formability and Stamping Characteristics** * **High Strength in Thin Sections** * **Age-Hardenable for Enhanced Properties** --- **Chemical Composition (Weight %)** | Element | Content (%) | |---------|-------------| | Nickel (Ni) | 36.0 - 39.0 | | Iron (Fe) | Balance | | Cobalt (Co) | 14.0 - 17.0 | | Niobium (Nb) + Tantalum (Ta) | 2.90 - 3.50 | | Titanium (Ti) | 1.35 - 1.75 | | Aluminum (Al) | 0.70 - 1.15 | | Silicon (Si) | ≤ 0.30 | | Manganese (Mn) | ≤ 0.20 | | Carbon (C) | ≤ 0.05 | | Sulfur (S) | ≤ 0.015 | | Boron (B) | ≤ 0.012 | --- **Physical Properties** | Property | Value | |----------|-------| | Density | 8.25 g/cm³ (0.298 lb/in³) | | Melting Range | 1370-1425°C (2500-2600°F) | | Mean Coefficient of Thermal Expansion | 8.5 × 10⁻⁶/°C (20-400°C) | | Thermal Conductivity | 11.5 W/m·K (at 100°C) | | Specific Heat | 440 J/kg·K (at 20°C) | | Electrical Resistivity | 1.05 μΩ·m | --- **Mechanical Properties (Age-Hardened Condition)** | Property | Foil (0.05-0.1mm) | Shim (0.1-1.0mm) | |----------|-------------------|------------------| | Tensile Strength | 1300-1450 MPa | 1250-1400 MPa | | Yield Strength (0.2% Offset) | 1100-1250 MPa | 1050-1200 MPa | | Elongation | 8-12% | 10-15% | | Hardness | 40-45 HRC | 38-43 HRC | --- **Product Applications** * **Aerospace & Defense** * Thin heat shields and thermal barriers * Precision sealing shims for engine components * Gaskets for high-temperature instrumentation * **Electronics & Semiconductors** * Lead frames requiring thermal stability * Heat spreaders in power electronics * Mounting shims for laser systems * **Precision Engineering** * Spacer shims for high-temperature equipment * Thin diaphragms and sensing elements * Shim stock for critical alignment * **Industrial Equipment** * High-temperature furnace components * Thermal management foils * Sealing elements for chemical processing * **Research & Development** * Cryogenic instrument components * Vacuum system seals and spacers * Experimental apparatus requiring thermal stability --- **International Standards & Specifications** **ASTM Standards:** - ASTM B625: Standard Specification for UNS N08904, N08354, and N09904 Plate, Sheet, and Strip - ASTM B906: Standard Specification for General Requirements for Flat-Rolled Nickel and Nickel Alloys Plate, Sheet, and Strip **Aerospace Standards (AMS):** - AMS 5916: Ring, Sealing, Low Thermal Expansion, Vacuum Melted **International Designations:** - UNS N19903 - W. Nr. 2.4717 **Quality Standards:** - Mill Certification to EN 10204 3.1/3.2 - Dimensional certification per customer requirements --- **Available Forms & Specifications** **Foil:** - Thickness: 0.025mm to 0.1mm (0.001" to 0.004") - Width: Up to 300mm (12") - Surface: Bright annealed or cold rolled - Tolerance: ±0.0025mm (±0.0001") **Shim:** - Thickness: 0.1mm to 1.0mm (0.004" to 0.040") - Width: Up to 600mm (24") - Surface: Bright finished or matte - Tolerance: ±0.005mm to ±0.025mm --- **Processing Characteristics** **Heat Treatment:** - Solution Annealing: 980°C ±15°C, rapid cool - Aging: 720°C/8hr + 620°C/8hr, air cool **Fabrication Notes:** - Best formed in solution-annealed condition - Final age-hardening after fabrication - Clean, oil-free handling recommended - Suitable for photo-etching and precision stamping --- **Note**: Incoloy 903 foil and shim are typically supplied in the solution-annealed condition for optimum formability. The material exhibits excellent stamping and etching characteristics in this condition. Final age-hardening treatment should be performed after all fabrication operations to achieve maximum mechanical properties and thermal stability. **Disclaimer**: The information provided is for reference purposes. Properties may vary based on manufacturing process, heat treatment, and specific thickness. For critical applications, always consult the manufacturer's technical data sheets and conduct appropriate qualification testing. Special handling may be required for ultra-thin foils to prevent damage.

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 3026 gallon liquid totes Special package is available on request.