Alloy 903,Incoloy 903 Pipe,,E FORU

British Specs:，American Specs:，German Specs:

**Product Introduction: Alloy 903 / Incoloy 903 Pipe (UNS N19903)** **Overview** Incoloy 903 pipe is a low thermal expansion superalloy product form specifically designed for applications requiring dimensional stability under thermal cycling conditions. This nickel-iron-cobalt alloy maintains nearly constant dimensions across a wide temperature range while providing high strength and excellent fatigue resistance. The pipe form is particularly suitable for high-precision fluid and gas handling systems where thermal expansion must be minimized to maintain system integrity and performance. **Key Characteristics** * **Controlled Low Coefficient of Thermal Expansion (CTE)** * **High Strength at Elevated Temperatures** * **Excellent Fatigue and Creep Resistance** * **Good Corrosion Resistance in Selected Environments** * **Age-Hardenable for Enhanced Mechanical Properties** * **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 | 1370-1425°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 Systems:** Hydraulic and fuel line systems requiring dimensional stability * **Power Generation:** High-precision steam and gas turbine piping systems * **Chemical Processing:** Instrumentation and sampling lines * **Nuclear Industry:** Reactor coolant pipes and instrumentation lines * **Advanced Engines:** Exhaust and manifold systems * **Research Facilities:** Precision vacuum and cryogenic systems * **Optical Industry:** Cooling jacket pipes for laser systems --- **International Standards & Specifications** * **ASTM Standards:** - ASTM B829: Standard Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes - ASTM B880: Standard Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys * **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 Pipe Forms:** - **Seamless Pipes:** OD from 6mm to 150mm - **Wall Thickness:** Schedule 5S to XXS - **Length:** Random lengths or cut-to-size - **Surface Finish:** Pickled, polished, or as-drawn * **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 pipes are typically supplied in the solution-annealed condition for optimum fabricability. 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. **Disclaimer:** The information provided is for reference purposes. Properties may vary based on manufacturing process, heat treatment, and pipe 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 3018 gallon liquid totes Special package is available on request.