Alloy W,Hastelloy W ,UNS N10004,E FORU

British Specs:，American Specs:AMS 5755 Bar and Forgings AMS 5786 Welding Wire，German Specs:

### **Product Datasheet: Alloy W / Hastelloy® W (UNS N10004)** **Overview** **Alloy W**, commercially known as **Hastelloy® W**, is a nickel-molybdenum-chromium alloy specifically designed for excellent corrosion resistance in a wide range of severe environments. Designated as **UNS N10004**, this solid-solution strengthened nickel-based alloy offers exceptional performance in both oxidizing and reducing media, particularly in acid services and high-temperature applications up to **980°C (1800°F)**. --- ### **1. Chemical Composition** The chemical composition of Hastelloy W (UNS N10004) conforms to the following specifications (balance is Nickel): | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | Balance | | **Molybdenum (Mo)** | 23.0 - 26.0 | | **Chromium (Cr)** | 4.5 - 7.0 | | **Iron (Fe)** | 4.0 - 7.0 | | **Cobalt (Co)** | ≤ 2.5 | | **Tungsten (W)** | 0.5 - 1.5 | | **Manganese (Mn)** | ≤ 1.0 | | **Silicon (Si)** | ≤ 1.0 | | **Vanadium (V)** | ≤ 0.2 | | **Carbon (C)** | ≤ 0.12 | | **Phosphorus (P)** | ≤ 0.04 | | **Sulfur (S)** | ≤ 0.03 | * **Functional Role of Key Elements:** * **Ni (Nickel)**: Provides the austenitic matrix, offering fundamental corrosion resistance and thermal stability. * **Mo (Molybdenum)**: Enhances resistance to reducing acids and localized corrosion. * **Cr (Chromium)**: Improves resistance to oxidizing environments and high-temperature oxidation. * **W (Tungsten)**: Provides solid-solution strengthening and enhances corrosion resistance. --- ### **2. Physical Properties** Characteristic physical properties for Hastelloy W at room temperature: | Property | Metric Value | Imperial Value | |----------|--------------|----------------| | **Density** | 8.94 g/cm³ | 0.323 lb/in³ | | **Melting Point** | 1330 - 1380 °C | 2425 - 2515 °F | | **Specific Heat (20°C)** | 442 J/kg·K | 0.106 Btu/lb·°F | | **Thermal Conductivity (20°C)** | 10.9 W/m·K | 75.6 Btu·in/hr·ft²·°F | | **Mean Coefficient of Thermal Expansion (20-100°C)** | 11.5 μm/m·°C | 6.4 x10⁻⁶ in/in·°F | | **Modulus of Elasticity** | 205 GPa | 29.7 x 10⁶ psi | | **Electrical Resistivity** | 1.30 μΩ·m | 790 ohm·cir mil/ft | --- ### **3. Mechanical Properties** Typical mechanical properties for annealed Hastelloy W: | Property | Typical Value | |----------|---------------| | **Tensile Strength** | 690 - 860 MPa (100 - 125 ksi) | | **Yield Strength (0.2% Offset)** | 310 - 485 MPa (45 - 70 ksi) | | **Elongation (in 50mm)** | 45 - 60% | | **Reduction of Area** | 50 - 70% | | **Hardness (Rockwell B)** | 85 - 100 HRB | * **High-Temperature Performance**: Hastelloy W maintains good mechanical properties and exhibits excellent corrosion resistance at elevated temperatures, particularly in acid environments and oxidizing conditions. --- ### **4. International Standards** Hastelloy W (UNS N10004) conforms to the following international standards: | Standard Body | Standard Designation | Product Form | |---------------|----------------------|--------------| | **ASTM International** | **ASTM B366** | Wrought Fittings | | **ASTM International** | **ASTM B435** | Plate, Sheet, and Strip | | **ASTM International** | **ASTM B572** | Rod/Bar | | **ASTM International** | **ASTM B619** | Welded Pipe | | **ASME** | **ASME SB-366** | Pressure Vessel Fittings | | **Aerospace Material Specification** | **AMS 5759** | Bars, Forgings, and Rings | | **European Standard** | **EN 10095** | Heat-Resisting Steels and Nickel Alloys | --- ### **5. Product Applications** Hastelloy W is extensively utilized in applications requiring superior corrosion resistance in severe environments: **Chemical Processing Industry:** - Sulfuric acid production equipment - Hydrochloric acid handling systems - Phosphoric acid processing equipment - Acid concentration and evaporation systems - Pickling tank components **Pharmaceutical Industry:** - Reaction vessels and reactors - Distillation columns - Heat exchangers in corrosive service - Piping systems for aggressive chemicals **Pollution Control:** - Flue gas desulfurization systems - Scrubbers and absorbers - Waste treatment equipment - Chemical recovery systems **Industrial Processing:** - Acid recovery plants - Metal treatment and pickling lines - Chemical synthesis equipment - High-temperature process vessels --- ### **6. Corrosion Resistance** * **Excellent resistance** to sulfuric acid at all concentrations and temperatures * **Good resistance** to hydrochloric and phosphoric acids * **Superior performance** in mixed acid environments * **Excellent resistance** to stress corrosion cracking * **Good oxidation resistance** at elevated temperatures --- ### **7. Fabrication Characteristics** * **Weldability**: Excellent using GTAW, GMAW, and SMAW processes * **Machinability**: Similar to other nickel-based alloys * **Heat Treatment**: Solution annealed at 1150-1200°C (2100-2190°F) * **Cold Working**: Good ductility permits cold forming operations * **Hot Working**: Recommended working temperature 1000-1200°C (1830-2190°F) --- **Disclaimer:** *Hastelloy® is a registered trademark of Haynes International. This information is for reference purposes only. For specific design and procurement, always consult the relevant material standards and the manufacturer's technical data sheets for certified properties. Performance in specific applications should be verified through appropriate testing.*

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 1871 gallon liquid totes Special package is available on request.