Hastelloy W alloy,1

### **Hastelloy® W Alloy (UNS N10004) - Nickel-Molybdenum-Chromium High-Temperature Alloy** #### **Overview** **Hastelloy® W Alloy** is a nickel-molybdenum-chromium alloy specifically designed for high-temperature applications requiring exceptional strength and oxidation resistance up to 1200°C (2200°F). This solid-solution strengthened superalloy offers excellent mechanical properties at elevated temperatures while maintaining good fabricability and weldability, making it suitable for demanding aerospace, industrial heating, and chemical processing applications. --- #### **Chemical Composition (Weight %)** | Element | Content (%) | Function | |---------|-------------|-----------| | **Nickel (Ni)** | **Balance** | **Base element providing high-temperature stability** | | **Molybdenum (Mo)** | **24.0-26.0** | **Primary solid solution strengthening element** | | **Chromium (Cr)** | **4.0-6.0** | **Oxidation resistance enhancement** | | **Iron (Fe)** | **4.0-6.0** | **Controlled for cost optimization and properties** | | **Cobalt (Co)** | **≤ 2.5** | **Controlled impurity** | | **Manganese (Mn)** | **0.50-1.25** | **Deoxidizer and sulfur control** | | **Silicon (Si)** | **0.50-1.00** | **Enhances oxidation resistance** | | **Tungsten (W)** | **0.50-1.00** | **Additional solid solution strengthening** | | **Vanadium (V)** | **≤ 0.20** | **Controlled impurity** | | **Carbon (C)** | **0.05-0.15** | **Controlled for carbide formation** | | **Phosphorus (P)** | **≤ 0.04** | **Controlled impurity** | | **Sulfur (S)** | **≤ 0.03** | **Controlled impurity** | --- #### **Physical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | **9.14 g/cm³ (0.330 lb/in³)** | | **Melting Range** | **1330-1380°C (2426-2516°F)** | | **Electrical Resistivity** | **1.35 μΩ·m** | | **Thermal Conductivity** | **12.2 W/m·K (at 100°C)** | | **Coefficient of Thermal Expansion** | **11.8 μm/m·°C (20-300°C)** | | **Specific Heat Capacity** | **432 J/kg·K** | | **Magnetic Permeability** | **< 1.005 (essentially non-magnetic)** | --- #### **Mechanical Properties (Annealed Condition)** | Temperature | Tensile Strength | Yield Strength (0.2%) | Elongation | |-------------|------------------|---------------------|------------| | **Room Temperature** | **790 MPa (115 ksi)** | **380 MPa (55 ksi)** | **45%** | | **650°C (1200°F)** | **655 MPa (95 ksi)** | **310 MPa (45 ksi)** | **40%** | | **815°C (1500°F)** | **485 MPa (70 ksi)** | **275 MPa (40 ksi)** | **35%** | | **980°C (1800°F)** | **240 MPa (35 ksi)** | **170 MPa (25 ksi)** | **40%** | --- #### **High-Temperature Performance Characteristics** | Property | Performance | Temperature Limit | |-------------|-------------|-------------------| | **Oxidation Resistance** | **Very Good** | **Up to 1150°C (2100°F)** | | **Creep Strength** | **Excellent** | **Long-term service at 870°C** | | **Thermal Stability** | **Good** | **Resists embrittlement up to 980°C** | | **Thermal Fatigue Resistance** | **Excellent** | **Cyclic temperature applications** | --- #### **Key Characteristics & Applications** **Key Characteristics:** - **Excellent High-Temperature Strength**: Maintains mechanical properties up to 1150°C - **Good Oxidation Resistance**: Suitable for continuous high-temperature service - **Superior Creep Resistance**: Excellent long-term stability under load - **Good Fabricability**: Can be readily formed and machined - **Excellent Weldability**: Suitable for all standard welding processes - **Phase Stability**: Resists formation of detrimental intermetallic phases **Typical Applications:** - **Aerospace Industry**: Gas turbine components, combustion chambers - **Industrial Furnaces**: Radiant tubes, retorts, and furnace fixtures - **Chemical Processing**: High-temperature reactors and heat exchangers - **Heat Treating Industry**: Baskets, trays, and fixtures - **Power Generation**: Gas turbine components and boiler parts - **Glass Manufacturing**: Processing equipment and handling systems - **Petrochemical**: Reformer tubes and pyrolysis equipment --- #### **International Standards & Specifications** | Standard | Designation | Description | |----------|-------------|-------------| | **AWS** | **A5.14** | **Nickel Alloy Bare Welding Electrodes and Rods** | | **AWS** | **A5.11** | **Nickel Alloy Covered Welding Electrodes** | | **ASME** | **SFA 5.11** | **Nickel Alloy Covered Electrodes** | | **ASME** | **SFA 5.14** | **Nickel Alloy Bare Electrodes and Rods** | | **AMS** | **5755** | **Bars, Forgings, and Rings** | | **AMS** | **5786** | **Welding Wire** | | **AMS** | **5787** | **Sheet, Strip, and Plate** | | **UNS** | **N10004** | **Unified Numbering System** | --- #### **Manufacturing & Processing** **Available Forms:** - **Sheet and Plate**: 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 - **Welding Products**: Electrodes, wires, and rods - **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**: 1150-1175°C (2102-2147°F) with rapid cooling - **Welding**: Excellent weldability using AWS A5.14/A5.11 compliant products - **Machining**: Similar to other nickel-based superalloys --- #### **Quality Control & Testing** - **Chemical Analysis**: Per ASTM E1473 standards - **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 - **Welding Qualification**: Per applicable AWS and ASME standards --- #### **Comparison with Competitive Alloys** | Property | Hastelloy W | Hastelloy X | Alloy 600 | Alloy 625 | |----------|-------------|-------------|-----------|-----------| | **Max Service Temperature** | **1150°C** | **1200°C** | **1095°C** | **1095°C** | | **High-Temperature Strength** | **Excellent** | **Excellent** | Good | Very Good | | **Oxidation Resistance** | **Very Good** | **Excellent** | Good | Very Good | | **Fabricability** | **Excellent** | **Excellent** | Excellent | Excellent | --- #### **Summary** **Hastelloy® W Alloy** represents a reliable high-temperature nickel-based alloy offering an excellent balance of elevated temperature strength, oxidation resistance, and fabricability. Its comprehensive coverage by major welding and material specifications (AWS A5.14, AWS A5.11, ASME SFA 5.11, ASME SFA 5.14, AMS 5755, AMS 5786, AMS 5787) ensures consistent quality and performance across various manufacturing processes. The alloy's proven performance in high-temperature applications, combined with excellent weldability and good mechanical properties, makes it a preferred choice for aerospace components, industrial heating equipment, and chemical processing systems operating under demanding thermal conditions. Supported by extensive industrial experience and rigorous quality standards, Hastelloy W continues to provide reliable service in applications where conventional materials cannot withstand the severe operating environments.

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 3252 gallon liquid totes Special package is available on request.