Alloy 903,Incoloy 903 Fittings,,E FORU

British Specs:，American Specs:，German Specs:

**Product Introduction: Alloy 903 / Incoloy 903 Fittings (UNS N19903)** **Overview** Incoloy 903 fittings are precision-engineered components manufactured from low thermal expansion superalloy, specifically designed for high-temperature applications requiring exceptional dimensional stability. These fittings maintain consistent performance under thermal cycling conditions from cryogenic temperatures up to 500°C (930°F), making them ideal for critical piping systems where thermal expansion must be minimized to ensure system integrity and reliability. **Key Characteristics** * **Controlled Low Thermal Expansion Coefficient** * **High Strength and Excellent Creep Resistance** * **Outstanding Fatigue Properties** * **Good Corrosion Resistance** * **Age-Hardenable for Enhanced Mechanical Performance** * **Maintains Dimensional Stability Under Thermal Cycling** --- **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) | | 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) | | 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 system fittings, engine piping components * **Power Generation**: High-temperature steam and gas turbine piping connections * **Chemical Processing**: Reactor and heat exchanger fittings * **Nuclear Industry**: Reactor coolant system components * **Advanced Engines**: Exhaust and turbocharger system fittings * **Precision Instruments**: Vacuum and cryogenic system connections * **Oil & Gas**: High-pressure, high-temperature wellhead components --- **International Standards & Specifications** * **ASTM Standards**: - ASTM B366: Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings - ASTM B637: Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock * **ASME Standards**: - ASME SB-366: Factory-Made Wrought Nickel and Nickel Alloy Fittings - ASME B16.9: Factory-Made Wrought Buttwelding Fittings - ASME B16.11: Forged Fittings, Socket-Welding and Threaded * **Aerospace Specifications**: - AMS 5916: Ring, Sealing, Low Thermal Expansion, Vacuum Melted * **International Designations**: - UNS N19903 - W. Nr. 2.4717 * **Available Fitting Types**: - **Butt-weld Fittings**: Elbows, tees, reducers, caps - **Socket Weld Fittings**: Unions, elbows, tees - **Threaded Fittings**: Nipples, couplings, adapters - **Flanges**: Slip-on, weld neck, blind flanges - **Special Fittings**: Custom-designed components * **Size Range**: - Butt-weld: 1/2" to 24" NPS - Socket weld: 1/8" to 4" NPS - Threaded: 1/8" to 2" NPS --- **Manufacturing Notes** Incoloy 903 fittings are typically manufactured from forged or wrought stock and supplied in solution-annealed condition. Final machining is performed to precise dimensional standards, with age-hardening treatment applied after all manufacturing processes to achieve optimal mechanical properties. Special attention is given to surface finish and dimensional accuracy to ensure proper fit-up and welding compatibility. **Quality Assurance** - 100% material certification - Dimensional verification - Non-destructive testing as required - Heat treatment compliance verification - Traceability maintained throughout manufacturing process **Disclaimer**: The information provided is for reference purposes. Properties may vary based on manufacturing process and heat treatment. For critical applications, consult manufacturer's technical data sheets and applicable standards. Proper installation procedures and welding protocols must be followed to ensure optimal performance.

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 3023 gallon liquid totes Special package is available on request.