Alloy 903,Incoloy 903 Plate,,E FORU

British Specs:，American Specs:，German Specs:

**Product Introduction: Alloy 903 / Incoloy 903 Plate (UNS N19903)** **Overview** Incoloy 903 plate is a low thermal expansion superalloy supplied in plate form, specifically engineered for applications requiring exceptional dimensional stability under thermal cycling conditions. This nickel-iron-cobalt age-hardenable alloy maintains consistent dimensions across a wide temperature range while providing high strength and excellent fatigue resistance. The plate form is particularly suitable for manufacturing large structural components where controlled thermal expansion is critical for system performance and reliability. **Key Characteristics** * **Controlled Low Coefficient of Thermal Expansion (CTE)** * **High Strength-to-Weight Ratio** * **Excellent Fatigue and Creep Resistance** * **Good Fabricability and Weldability** * **Age-Hardenable for Enhanced Mechanical Properties** * **Maintains Properties from Cryogenic to 500°C** --- **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 | | Modulus of Elasticity | 148 GPa (21.5 × 10⁶ psi) | --- **Mechanical Properties (Age-Hardened Condition)** | Property | Value | |----------|-------------| | Tensile Strength | 1240-1380 MPa (180-200 ksi) | | Yield Strength (0.2% Offset) | 1030-1170 MPa (150-170 ksi) | | Elongation | 12-18% | | Hardness | 36-42 HRC | --- **Product Applications** * **Aerospace Components**: Engine mounts, structural frames, and support plates * **Power Generation**: Turbine casings, structural supports, and heat shield plates * **Chemical Processing**: Reactor vessels and heat exchanger plates * **Nuclear Industry**: Reactor structural components and support plates * **Precision Instruments**: Optical platforms and measurement equipment bases * **Automotive Industry**: Turbocharger components and exhaust system parts * **Research Equipment**: Vacuum chamber components and cryogenic support structures --- **International Standards & Specifications** * **ASTM Standards**: - ASTM B625: Standard Specification for UNS N08904, N08354, and N09904 Plate, Sheet, and Strip * **Aerospace Materials Specifications**: - AMS 5916: Ring, Sealing, Low Thermal Expansion, Vacuum Melted, Solution and Precipitation Heat Treated * **International Designations**: - UNS N19903 - W. Nr. 2.4717 * **Available Plate Specifications**: - **Thickness**: 5mm to 150mm - **Width**: 1000mm to 2000mm - **Length**: 2000mm to 6000mm - **Surface Condition**: Hot-rolled, annealed, or pickled * **Heat Treatment**: - Solution Annealing: 980°C ±15°C, rapid cool - Aging Treatment: 720°C for 8 hours, furnace cool to 620°C for 8 hours, air cool --- **Note**: Incoloy 903 plates are typically supplied in the solution-annealed condition for optimum machinability and formability. Final age-hardening is performed after all fabrication and machining operations. Special consideration should be given to welding procedures and subsequent heat treatment to maintain optimal properties. The material's low thermal expansion characteristic makes it particularly suitable for applications where thermal cycling could cause dimensional changes in conventional materials. **Disclaimer**: The information provided is for reference purposes. Properties may vary based on manufacturing process, heat treatment, and plate dimensions. For critical applications, always consult the manufacturer's technical data sheets and complete material certifications. Proper material selection should be verified through appropriate engineering analysis.

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 3020 gallon liquid totes Special package is available on request.