Alloy S,Hastelloy S,UNS N06635，EFORU

### **Alloy S / Hastelloy® S (UNS N06635) - Technical Datasheet** --- #### **1. Overview** **Hastelloy® S** (UNS N06635) is a nickel-chromium-molybdenum alloy specifically designed for exceptional high-temperature strength and oxidation resistance up to 1200°C (2200°F). This precipitation-hardenable superalloy combines excellent creep rupture strength with outstanding resistance to oxidizing, reducing, and neutral atmospheres. Originally developed for gas turbine engine components, it maintains structural stability and corrosion resistance in prolonged high-temperature service. --- #### **2. Chemical Composition (Weight %)** The composition is balanced for optimal high-temperature performance. | Element | Content (%) | Role & Benefit | |---------|-------------|----------------| | **Nickel (Ni)** | Balance | Austenitic matrix providing high-temperature strength | | **Chromium (Cr)** | 14.0 - 16.0 | Primary oxidation and hot corrosion resistance | | **Molybdenum (Mo)** | 14.0 - 16.0 | Solid solution strengthening and creep resistance | | **Cobalt (Co)** | 1.0 - 3.0 | Enhances high-temperature strength | | **Tungsten (W)** | 1.0 - 2.0 | Solid solution strengthening | | **Iron (Fe)** | 2.0 - 4.0 | Controlled for optimal phase stability | | **Aluminum (Al)** | 0.25 - 0.75 | Forms strengthening γ' precipitates | | **Titanium (Ti)** | 2.0 - 3.0 | Primary precipitation hardening element | | **Manganese (Mn)** | 0.50 max | Deoxidizer and workability agent | | **Silicon (Si)** | 0.50 max | Oxidation resistance enhancement | | **Carbon (C)** | 0.02 - 0.08 | Controlled for carbide formation | | **Lanthanum (La)** | 0.01 - 0.05 | Improves oxide scale adhesion | *Note: "Hastelloy" is a registered trademark of Haynes International Inc.* --- #### **3. Physical Properties** The physical properties support extreme high-temperature applications. | Property | Value | |----------|-------| | **Density** | 8.31 g/cm³ (0.300 lb/in³) | | **Melting Point** | 1335-1380°C (2435-2515°F) | | **Specific Heat (20°C)** | 440 J/kg·K | | **Thermal Conductivity** | 11.2 W/m·K (at 20°C) | | **Mean Coefficient of Thermal Expansion** | 12.8 × 10⁻⁶/°C (20-300°C) | | **Electrical Resistivity** | 1.28 μΩ·m | | **Modulus of Elasticity** | 216 GPa (31.3 × 10⁶ psi) | | **Magnetic Permeability** | Essentially non-magnetic | --- #### **4. Mechanical Properties** Properties vary significantly with heat treatment condition. **Solution Annealed Condition (1175°C/2150°F):** | Property | Value | |----------|-------| | **Tensile Strength** | 760-895 MPa (110-130 ksi) | | **Yield Strength (0.2% Offset)** | 345-485 MPa (50-70 ksi) | | **Elongation** | 40-50% | | **Hardness** | 90-100 HRB | **Aged Condition (815°C/1500°F for 16 hours):** | Property | Value | |----------|-------| | **Tensile Strength** | 1100-1240 MPa (160-180 ksi) | | **Yield Strength** | 760-895 MPa (110-130 ksi) | | **Elongation** | 15-25% | | **Hardness** | 32-38 HRC | **Elevated Temperature Properties (870°C/1600°F):** | Property | Value | |----------|-------| | **Tensile Strength** | 415 MPa (60 ksi) | | **Yield Strength** | 310 MPa (45 ksi) | | **Creep Rupture Strength (1000h)** | 85 MPa (12 ksi) | --- #### **5. Product Applications** **Hastelloy S** serves in demanding high-temperature environments: - **Aerospace Industry:** - Gas turbine engine components - Combustion chambers and liners - Afterburner parts - Turbine seals and rings - **Industrial Gas Turbines:** - Hot section components - Combustion systems - Transition ducts - Turbine casings - **Heat Treatment Industry:** - High-temperature furnace fixtures - Heat treatment baskets and trays - Radiant tubes - Thermocouple protection sheaths - **Chemical Processing:** - High-temperature reactor vessels - Catalytic converter components - Petrochemical cracking equipment - High-temperature heat exchangers - **Power Generation:** - Gas turbine components - Heat recovery system parts - Advanced power system components --- #### **6. International Standards** The material conforms to various international specifications: | Standard | Specification | |----------|---------------| | **ASTM** | ASTM B435 - UNS N06635 Plate, Sheet, and Strip
ASTM B572 - UNS N06635 Rod
ASTM B619 - Welded Pipe | | **UNS** | UNS N06635 | | **ASME** | SB-435, SB-572, SB-619 | | **Aerospace** | AMS 5715 | | **European** | EN 10095 - NW 12 | | **ISO** | ISO 6208 - NiCr15Mo | --- #### **7. Corrosion Resistance** - **Excellent** oxidation resistance up to 1200°C (2200°F) - **Outstanding** resistance to thermal cycling - **Good** performance in sulfidizing environments - **Excellent** carburization resistance - **Good** resistance to chlorine-containing atmospheres - **Maintains** strength in prolonged high-temperature exposure --- #### **8. Fabrication Characteristics** - **Machining:** Best machined in solution annealed condition - **Welding:** Good weldability using GTAW with matching filler metal - **Forming:** Good hot working characteristics; requires care in cold forming - **Heat Treatment:** Solution treat at 1150-1200°C (2100-2190°F), age at 700-900°C (1290-1650°F) - **Post-Weld Heat Treatment:** Recommended for optimal properties --- #### **9. Special Considerations** - **Temperature Capability:** Continuous service to 1200°C (2200°F) - **Oxide Scale:** Forms protective, adherent chromium oxide scale - **Thermal Stability:** Resistant to sigma phase formation - **Aging Response:** Can be heat treated to various strength levels - **Environmental Performance:** Excellent in cyclic oxidation conditions --- #### **10. Summary** **Hastelloy® S (UNS N06635)** represents a premium precipitation-hardenable nickel-based superalloy engineered for extreme high-temperature applications requiring exceptional oxidation resistance and mechanical strength. Its balanced composition, featuring chromium for oxidation resistance, molybdenum for strengthening, and titanium/aluminum for precipitation hardening, delivers superior performance in gas turbine engines, industrial heating systems, and high-temperature chemical processing equipment. The alloy's unique capability to maintain structural integrity and corrosion resistance at temperatures up to 1200°C, combined with good fabricability, makes it indispensable for the most demanding high-temperature applications. Governed by comprehensive international standards including ASTM B435 and aerospace specifications, Hastelloy S continues to be the material of choice for critical components where reliability at extreme temperatures is paramount.

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 1719 gallon liquid totes Special package is available on request.