Alloy S,Hastelloy S Tube,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) Tube** **Overview** Alloy S Tube, commercially known as Hastelloy® S Tube and standardized as UNS N06635, is a nickel-chromium-molybdenum wrought superalloy specifically designed for high-temperature tubular applications requiring exceptional oxidation resistance, thermal stability, and corrosion resistance. This tube product form is engineered to handle extreme thermal cycling conditions and aggressive environments while maintaining structural integrity at temperatures up to 1200°C (2200°F). **Key Characteristics of Alloy S Tube** * **Exceptional Thermal Stability**: Maintains microstructural stability and resists embrittlement during prolonged exposure to high temperatures * **Superior Oxidation Resistance**: Lanthanum-enhanced oxide scale provides outstanding protection against spallation during thermal cycling * **Excellent Creep Rupture Strength**: Superior stress rupture life compared to conventional chromia-forming alloys * **Outstanding Thermal Fatigue Resistance**: Withstands repeated heating and cooling cycles without degradation * **Good Fabricability**: Can be readily bent, coiled, and welded using standard techniques for high-performance nickel alloys --- **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) | | **Electrical Resistivity** | 1.30 μΩ·m | --- **Mechanical Properties (Typical for Tube Product)** **Room Temperature (Annealed Condition):** * **Tensile Strength**: 795 MPa (115 ksi) minimum * **Yield Strength (0.2% Offset)**: 345 MPa (50 ksi) minimum * **Elongation**: 35% minimum **Elevated Temperature Performance (980°C / 1800°F):** * **Stress-Rupture Strength**: Excellent long-term stress rupture life * **Creep Resistance**: Outstanding resistance to deformation under sustained load * **Thermal Fatigue Resistance**: Superior performance under cyclic thermal conditions --- **Product Applications** Alloy S Tube is specified for critical high-temperature applications across multiple industries: **Industrial Thermal Processing:** * Radiant tubes in heat treatment furnaces * Heat exchanger tubing for high-temperature service * Thermocouple protection sheaths * Muffles and retorts for atmosphere processing * Recuperator tubes for energy recovery systems **Aerospace & Defense:** * Combustion chamber liners * Afterburner components * Exhaust system components * High-temperature hydraulic lines **Chemical & Petrochemical Processing:** * Catalyst carrier tubes * Pyrolysis furnace tubes * Waste gas incineration systems * High-temperature reactor tubing **Power Generation:** * Heat exchanger tubes in advanced power systems * Superheater and reheater tubes * Nuclear reactor instrumentation tubes --- **International Standards for Tube Products** | Standard Organization | Standard Number | Description | |---------------------|-----------------|-------------| | **ASTM International** | **ASTM B622** | Standard Specification for Seamless Nickel and Nickel Alloy Tube | | **ASTM International** | **ASTM B626** | Standard Specification for Welded Nickel and Nickel Alloy Tube | | **ASTM International** | **ASTM B751** | General Requirements for Nickel Alloy Tube | | **ASME** | **ASME SB-622**
**ASME SB-626** | Code-approved versions for pressure component applications | | **ISO** | **ISO 6207** | Nickel alloy tubes for general purposes | | **DIN** | **DIN 17750** | Nickel and nickel alloy tubes - technical delivery conditions | | **UNS** | **UNS N06635** | Unified numbering system designation | **Available Tube Specifications:** * **Types**: Seamless and welded construction * **Sizes**: Outer diameters from 1/8" to 12" with various wall thicknesses * **Tolerances**: To ASTM, ASME, or customer specifications * **Lengths**: Random and cut-to-length options * **Surface Finish**: Annealed and pickled, bright annealed, or ground finish **Fabrication Notes:** * **Welding**: Compatible with GTAW process using ERNiCrMo-14 or equivalent filler metal * **Cold Working**: Excellent capability for bending and coiling operations * **Heat Treatment**: Solution annealed at 1177°C (2150°F) minimum with rapid cooling * **Quality Testing**: Available with hydrostatic testing, eddy current testing, ultrasonic testing, and pneumatic testing **Disclaimer:** This technical information is provided for reference purposes only. Specific properties may vary depending on manufacturing process, heat treatment, and tube dimensions. For critical applications, always consult the appropriate material standards 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 2889 gallon liquid totes Special package is available on request.