Alloy 903,Incoloy 903 Rod,,E FORU

British Specs:，American Specs:，German Specs:

**Product Introduction: Alloy 903 / Incoloy 903 Rod (UNS N19903)** **Overview** Alloy 903 (Incoloy 903) rod is a premium nickel-iron-cobalt low thermal expansion superalloy supplied in bar form. This age-hardenable material is specifically engineered to maintain exceptional dimensional stability under thermal cycling conditions while delivering high strength from cryogenic temperatures up to 500°C (930°F). The rod form is particularly suited for machining precision components that require tight tolerances and stable mechanical properties in demanding thermal environments. **Key Characteristics** * **Controlled Low Coefficient of Thermal Expansion (CTE)** * **High Strength-to-Weight Ratio** * **Excellent Machinability in Annealed Condition** * **Age-Hardenable for Enhanced Strength** * **Good Fatigue and Creep Resistance** * **Maintains Properties from Cryogenic to Moderate High Temperatures** --- **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 °C (~2500 °F) | | Mean Coefficient of Thermal Expansion (20-400°C) | 8.5 × 10⁻⁶/°C | | Thermal Conductivity (100°C) | 11.5 W/m·K | | Specific Heat (20°C) | 440 J/kg·K | | 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% | | Reduction of Area | 18-28% | | Hardness | 36-42 HRC | --- **Product Applications** * **Aerospace Components**: Gas turbine engine rings, seals, and shafts * **Precision Instruments**: Dimensionally stable frames and supports * **Automotive Turbochargers**: High-temperature components requiring thermal stability * **Nuclear Reactor Components**: Control rod mechanisms and structural parts * **Optical Systems**: Mounting hardware and structural elements * **Specialized Fasteners**: High-strength bolts and studs for thermal applications --- **International Standards & Specifications** * **ASTM Standards**: - ASTM B637: Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service * **Aerospace Materials Specification**: - AMS 5916: Ring, Sealing, Low Thermal Expansion, 38Ni-15Co-3Cb-1.7Ti-1.4Al, Vacuum Melted, Solution and Precipitation Heat Treated * **International Designations**: - UNS N19903 - W. Nr. 2.4717 * **Available Forms**: - Round Bars: 5mm to 300mm diameter - Hexagonal Bars: 10mm to 100mm across flats - Square Bars: 10mm to 100mm - Surface: Black, ground, polished, or turned * **Heat Treatment**: - Solution Annealing: 980°C (1800°F) ±15°C, rapid cool - Aging: 720°C (1325°F) for 8 hours, furnace cool to 620°C (1150°F) for 8 hours, air cool --- **Note**: Incoloy 903 rod is typically supplied in the solution-annealed condition for optimum machinability, with final age-hardening performed after machining to achieve full mechanical properties. Special care must be taken during heat treatment to avoid surface contamination. **Disclaimer**: The information provided is for reference purposes. Properties may vary based on manufacturing process, heat treatment, and rod diameter. For critical applications, always consult the manufacturer's technical data sheets and complete material certifications.

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 3016 gallon liquid totes Special package is available on request.