Alloy S,Hastelloy S Fittings,UNS N06635,E FORU

British Specs:，American Specs: AMS 5711 Bar and Forging AMS 5838 Welding Wire AMS 5873 Sheet, Strip and Plate，German Specs:

**Technical Datasheet: Alloy S (UNS N06635) Fittings** **Overview** Alloy S Fittings, commercially known as Hastelloy® S Fittings and standardized as UNS N06635, are precision-engineered components manufactured from nickel-chromium-molybdenum superalloy for high-temperature piping systems. These fittings are specifically designed to maintain system integrity in applications demanding exceptional oxidation resistance, thermal stability, and corrosion resistance at temperatures up to 1200°C (2200°F). The fittings ensure reliable performance in aggressive environments while providing easy installation and maintenance capabilities. **Key Characteristics of Alloy S Fittings** - **Exceptional High-Temperature Strength**: Maintains mechanical integrity and pressure boundary under sustained thermal exposure - **Superior Oxidation Resistance**: Lanthanum-enhanced composition provides excellent resistance to scale formation and spallation - **Outstanding Thermal Stability**: Resists embrittlement and maintains ductility during prolonged high-temperature service - **Excellent Corrosion Resistance**: Withstands oxidizing, sulfidizing, and carburizing environments - **Precision Manufacturing**: Consistent dimensional accuracy and surface finish for reliable performance --- **Chemical Composition (Weight % Typical)** | Element | Percentage (%) | Primary Function | |---------|----------------|------------------| | **Nickel (Ni)** | Balance (~67%) | Austenitic matrix foundation providing thermal stability | | **Chromium (Cr)** | 14.0 - 16.0% | Primary oxidation and sulfidation resistance | | **Molybdenum (Mo)** | 14.0 - 16.0% | Solid solution strengthening and reducing environment resistance | | **Iron (Fe)** | 3.0% max | Residual element control | | **Tungsten (W)** | 1.0% max | Enhanced solid solution strengthening | | **Cobalt (Co)** | 2.0% max | Controlled residual element | | **Manganese (Mn)** | 0.50% max | Hot workability enhancement | | **Silicon (Si)** | 0.40% max | Oxidation resistance improvement | | **Lanthanum (La)** | 0.02% min | **Critical element** for oxide scale adhesion under thermal cycling | | **Carbon (C)** | 0.015% max | Minimized to prevent detrimental carbide formation | | **Boron (B)** | 0.010% max | Creep ductility enhancement | *Note: "Hastelloy" is a registered trademark of Haynes International Inc.* --- **Physical Properties (Typical - Annealed Condition)** | Property | Value | |----------|-------| | **Density** | 8.86 g/cm³ (0.320 lb/in³) | | **Melting Range** | 1335 - 1380°C (2435 - 2520°F) | | **Thermal Conductivity** | 11.0 W/m·K (at 20°C) | | **Mean Coefficient of Thermal Expansion** | 12.8 μm/m·°C (20-100°C) | | **Modulus of Elasticity** | 211 GPa (30.6 x 10⁶ psi) | | **Specific Heat Capacity** | 427 J/kg·K (at 20°C) | --- **Mechanical Properties (Typical for Fittings)** **Room Temperature (Annealed Condition):** - **Tensile Strength**: 795 MPa (115 ksi) minimum - **Yield Strength (0.2% Offset)**: 345 MPa (50 ksi) minimum - **Elongation**: 35% minimum - **Hardness**: HB 190 maximum **Pressure-Temperature Ratings:** - **Maximum Working Pressure**: Rated per ASME B16.5 and B16.9 standards - **Temperature Range**: -196°C to 1200°C (-320°F to 2200°F) - **Pressure Retention**: Excellent creep strength maintains pressure boundary integrity --- **Product Applications** Alloy S Fittings are specified for critical high-temperature piping systems across multiple industries: **Industrial Thermal Processing:** - High-temperature furnace piping systems - Heat treatment facility manifolds - Radiant tube connections - Thermal fluid system components - Exhaust and fume handling systems **Chemical & Petrochemical Processing:** - Reactor inlet/outlet manifolds - Catalyst regeneration systems - High-temperature transfer lines - Waste gas incineration systems - Pyrolysis unit piping **Power Generation:** - High-temperature heat exchanger piping - Combustion system components - Exhaust gas recirculation systems - Advanced power system piping **Aerospace & Defense:** - Test facility piping systems - Propulsion system ground support - High-temperature hydraulic systems --- **Types of Fittings Available** **Butt-Weld Fittings:** - Elbows (45°, 90°, 180°) - Tees (equal and reducing) - Reducers (concentric and eccentric) - Caps and stub ends **Socket-Weld Fittings:** - Unions - Elbows - Tees - Couplings **Threaded Fittings:** - NPT threaded components - BSP threaded options available **Special Fittings:** - Custom-designed components - High-temperature expansion joints - Special manifold configurations --- **International Standards for Fittings** | Standard Organization | Standard Number | Description | |---------------------|-----------------|-------------| | **ASTM International** | **ASTM B366** | Standard Specification for Factory-Made Wrought Nickel and Nickel-Alloy Fittings | | **ASME** | **ASME SB-366** | Code-approved version for pressure component applications | | **ASME** | **ASME B16.9** | Factory-Made Wrought Buttwelding Fittings | | **ASME** | **ASME B16.11** | Forged Fittings, Socket-Welding and Threaded | | **ASME** | **ASME B16.5** | Pipe Flanges and Flanged Fittings | | **MSS** | **MSS SP-43** | Wrought Stainless Steel Butt-Welding Fittings | | **ISO** | **ISO 9001** | Quality Management Systems | | **UNS** | **UNS N06635** | Unified numbering system designation | **Manufacturing Standards:** - **Quality Assurance**: ISO 9001 certified manufacturing - **Testing Requirements**: Hydrostatic testing, PMI verification, dimensional inspection - **Certification**: Material Test Certificates per EN 10204 3.1/3.2 - **Traceability**: Complete material traceability from melt to finished product **Installation & Service Notes:** - **Welding Compatibility**: Excellent weldability using matching filler metals - **Joint Preparation**: Standard preparation per ASME B31.3 requirements - **Gasket Selection**: Compatible with high-temperature gasketing materials - **Maintenance**: Minimal maintenance requirements due to inherent corrosion resistance - **Service Life**: Extended service life in high-temperature applications **Disclaimer:** This technical information is provided for reference purposes only. Specific properties and performance may vary depending on manufacturing process, heat treatment, and fitting design. For critical applications, always consult the appropriate material standards, design codes, and manufacturer's certified test reports. "Hastelloy" is a registered trademark of Haynes International.

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 2893 gallon liquid totes Special package is available on request.