Hastelloy S alloy,UNS N06635, AMS 5711, AMS 5838, AMS 5873，1

### **Hastelloy® S Alloy (UNS N06635) - Nickel-Chromium-Molybdenum-Cobalt High-Temperature Alloy** #### **Overview** **Hastelloy® S Alloy** is a nickel-chromium-molybdenum-cobalt alloy specifically engineered for exceptional high-temperature strength and outstanding oxidation resistance up to 1150°C (2100°F). This precipitation-hardenable superalloy exhibits excellent structural stability and resistance to stress-rupture failure under prolonged exposure to extreme temperatures, making it particularly suitable for aerospace and industrial gas turbine applications. --- #### **Chemical Composition (Weight %)** | Element | Content (%) | Function | |---------|-------------|-----------| | **Nickel (Ni)** | **Balance** | **Base element providing high-temperature stability** | | **Chromium (Cr)** | **14.0-16.0** | **Primary oxidation resistance through Cr₂O₃ scale formation** | | **Molybdenum (Mo)** | **14.0-16.0** | **Solid solution strengthening and creep resistance** | | **Cobalt (Co)** | **14.0-16.0** | **Enhances high-temperature strength and stability** | | **Tungsten (W)** | **-** | **Iron (Fe)** | **≤ 3.0** | **Controlled impurity** | | **Aluminum (Al)** | **≤ 0.50** | **Controlled impurity** | | **Titanium (Ti)** | **≤ 0.50** | **Controlled impurity** | | **Manganese (Mn)** | **≤ 0.50** | **Deoxidizer** | | **Silicon (Si)** | **≤ 0.50** | **Controlled impurity** | | **Carbon (C)** | **≤ 0.02** | **Minimized for carbide control** | | **Lanthanum (La)** | **0.01-0.05** | **Enhances oxide scale adhesion** | | **Boron (B)** | **≤ 0.010** | **Grain boundary strengthening** | --- #### **Physical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | **8.86 g/cm³ (0.320 lb/in³)** | | **Melting Range** | **1370-1425°C (2500-2600°F)** | | **Electrical Resistivity** | **1.30 μΩ·m** | | **Thermal Conductivity** | **11.5 W/m·K (at 100°C)** | | **Coefficient of Thermal Expansion** | **12.6 μm/m·°C (20-300°C)** | | **Specific Heat Capacity** | **440 J/kg·K** | | **Magnetic Permeability** | **< 1.005 (essentially non-magnetic)** | --- #### **Mechanical Properties (Solution Annealed & Aged)** | Temperature | Tensile Strength | Yield Strength (0.2%) | Elongation | |-------------|------------------|---------------------|------------| | **Room Temperature** | **965 MPa (140 ksi)** | **585 MPa (85 ksi)** | **35%** | | **650°C (1200°F)** | **825 MPa (120 ksi)** | **550 MPa (80 ksi)** | **30%** | | **815°C (1500°F)** | **620 MPa (90 ksi)** | **480 MPa (70 ksi)** | **25%** | | **980°C (1800°F)** | **310 MPa (45 ksi)** | **275 MPa (40 ksi)** | **30%** | --- #### **High-Temperature Performance Characteristics** | Property | Performance | Temperature Limit | |-------------|-------------|-------------------| | **Oxidation Resistance** | **Excellent** | **Up to 1150°C (2100°F)** | | **Creep Strength** | **Outstanding** | **Long-term service at 980°C** | | **Thermal Fatigue Resistance** | **Excellent** | **Cyclic temperature applications** | | **Structural Stability** | **Superior** | **Resists sigma phase formation** | --- #### **Key Characteristics & Applications** **Key Characteristics:** - **Exceptional High-Temperature Strength**: Maintains mechanical properties up to 1150°C - **Outstanding Oxidation Resistance**: Lanthanum-stabilized protective scale - **Excellent Thermal Stability**: Resists embrittlement during long-term exposure - **Superior Creep Resistance**: Excellent stress-rupture properties - **Good Fabricability**: Can be welded and formed using appropriate techniques - **Phase Stability**: Minimal formation of detrimental secondary phases **Typical Applications:** - **Aerospace Industry**: Gas turbine combustion chambers, afterburner components - **Industrial Gas Turbines**: Combustion liners, transition pieces, nozzle guide vanes - **Heat Treating Industry**: High-temperature fixtures, radiant tubes, retorts - **Chemical Processing**: High-temperature reactors and reformer tubes - **Power Generation**: Gas turbine components and high-temperature systems - **Nuclear Industry**: High-temperature reactor components - **Petrochemical**: Pyrolysis furnace components --- #### **International Standards & Specifications** | Standard | Designation | Description | |----------|-------------|-------------| | **UNS** | **N06635** | **Unified Numbering System** | | **AMS** | **5711** | **Bars, Forgings, and Rings** | | **AMS** | **5838** | **Welding Wire** | | **AMS** | **5873** | **Sheet, Strip, and Plate** | | **ASTM** | **B435** | **Plate, Sheet, and Strip** | | **ASTM** | **B572** | **Rod and Bar** | | **ASME** | **Boiler Code** | **Approved for pressure vessel applications** | --- #### **Manufacturing & Processing** **Available Forms:** - **Plate and Sheet**: 0.5 mm to 100 mm thickness - **Bar and Rod**: 5 mm to 300 mm diameter - **Pipe and Tube**: 10 mm to 600 mm diameter - **Wire and Strip**: Various sizes for specialized applications - **Forgings and Rings**: Custom components for critical applications **Processing Guidelines:** - **Hot Working**: 1150-1200°C (2102-2192°F) - **Cold Working**: Good capability with intermediate annealing - **Solution Annealing**: 1175-1200°C (2147-2192°F) with rapid cooling - **Aging Treatment**: 800-850°C (1472-1562°F) for 16 hours - **Welding**: Excellent weldability using AMS 5838 filler metal - **Machining**: Similar to other nickel-based superalloys --- #### **Quality Control & Testing** - **Chemical Analysis**: Per ASTM E1473 - **Mechanical Testing**: Per ASTM E8/E8M and E21 - **Creep and Stress Rupture**: Per ASTM E139 - **Non-Destructive Testing**: UT, RT, PT as required - **Metallographic Examination**: Per ASTM E3 and E112 - **High-Temperature Testing**: Oxidation and thermal stability evaluation --- #### **Comparison with Competitive Alloys** | Property | Hastelloy S | Alloy X | Alloy 617 | Waspaloy | |----------|-------------|---------|-----------|----------| | **Max Service Temperature** | **1150°C** | **1150°C** | **1095°C** | **870°C** | | **Oxidation Resistance** | **Excellent** | Excellent | Very Good | Good | | **Creep Strength** | **Superior** | Very Good | Good | Excellent | | **Fabricability** | **Good** | Excellent | Good | Good | --- #### **Summary** **Hastelloy® S Alloy (UNS N06635)** represents a premium high-temperature nickel-based superalloy specifically engineered for demanding applications in extreme thermal environments. Its optimized composition, featuring balanced chromium, molybdenum, and cobalt additions with lanthanum for enhanced oxidation resistance, provides exceptional performance in aerospace, power generation, and industrial heating applications. Supported by comprehensive AMS standardization (5711, 5838, 5873), this alloy delivers reliable long-term performance where structural stability and oxidation resistance are critical requirements. The alloy's proven track record in gas turbine applications and high-temperature industrial processes ensures its continued importance in advanced engineering systems where conventional materials cannot withstand the severe operating conditions.

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 3251 gallon liquid totes Special package is available on request.