Alloy B-2,ASME SB-333, ASME SB-335, 1

### **Product Introduction: Alloy B-2 (UNS N10665) - Nickel-Molybdenum Corrosion-Resistant Alloy** **Overview** Alloy B-2 is a nickel-molybdenum alloy specifically designed to provide exceptional resistance to reducing corrosive environments. This non-stabilized, low-iron, low-silicon version of the nickel-molybdenum system offers superior performance in handling hydrochloric acid at all concentrations and temperatures, making it particularly valuable in chemical processing applications. The alloy maintains excellent corrosion resistance in the as-welded condition without requiring post-weld heat treatment. --- #### **Chemical Composition (Typical % by Weight)** | Element | Content (%) | Role & Benefit | |---------|-------------|---------------| | **Nickel (Ni)** | Balance | Primary matrix element providing fundamental corrosion resistance | | **Molybdenum (Mo)** | 26.0 - 30.0 | Imparts exceptional resistance to reducing acids, particularly hydrochloric acid | | **Iron (Fe)** | 2.0 max | Controlled to minimize corrosion in specific environments | | **Chromium (Cr)** | 1.0 max | Limited to maintain performance in reducing conditions | | **Manganese (Mn)** | 1.0 max | Aids in manufacturability | | **Cobalt (Co)** | 1.0 max | Controlled residual element | | **Vanadium (V)** | 0.20 max | Trace element for process control | | **Silicon (Si)** | 0.10 max | Kept low to prevent intergranular corrosion | | **Carbon (C)** | 0.02 max | Minimized to prevent carbide precipitation | | **Phosphorus (P)** | 0.04 max | Controlled for optimal properties | | **Sulfur (S)** | 0.03 max | Minimized to prevent hot cracking | --- #### **Physical & Mechanical Properties** **Physical Properties:** - Density: 9.22 g/cm³ (0.333 lb/in³) - Melting Range: 1330-1380°C (2426-2516°F) - Thermal Expansion: 10.3 μm/m·°C @ 20-100°C - Thermal Conductivity: 10.8 W/m·K @ 100°C - Specific Heat Capacity: 380 J/kg·K @ 20°C - Modulus of Elasticity: 217 GPa (31.5 x 10⁶ psi) - Magnetic Permeability: Essentially non-magnetic **Mechanical Properties (Annealed Condition):** - Tensile Strength: 758-965 MPa (110-140 ksi) - Yield Strength (0.2% Offset): 345-517 MPa (50-75 ksi) - Elongation: 40-60% - Hardness: HRB 85-100 --- #### **International Standards and Specifications** - **ASME SB-333:** Nickel-Molybdenum Alloy Plate, Sheet, and Strip - **ASME SB-335:** Nickel-Molybdenum Alloy Seamless Pipe and Tube - **ASME SB-619:** Nickel-Molybdenum Alloy Welded Pipe - **ASME SB-622:** Nickel-Molybdenum Alloy Seamless Pipe and Tube - **ASME SB-626:** Nickel-Molybdenum Alloy Welded Tube - **ASTM B333:** Standard Specification for Nickel-Molybdenum Alloy Plate, Sheet, and Strip - **ASTM B335:** Standard Specification for Nickel-Molybdenum Alloy Rod - **UNS N10665:** Unified Numbering System Designation --- #### **Product Applications** **Chemical Processing Industry:** - Hydrochloric acid production and handling systems - Sulfuric acid processing equipment - Acetic acid and anhydride production - Chemical reaction vessels and reactors - Heat exchangers and condensers **Pharmaceutical Industry:** - Process equipment for acid-based reactions - High-purity chemical synthesis systems - Pharmaceutical intermediate production - Specialty chemical manufacturing **Other Industrial Applications:** - Acid recovery systems - Pickling tank equipment - Electroplating industry components - Industrial waste treatment systems --- #### **Key Advantages** 1. **Exceptional Resistance to Reducing Acids**: Superior performance in hydrochloric acid at all concentrations and temperatures 2. **Excellent Corrosion Resistance**: Outstanding performance in non-oxidizing environments 3. **Good Thermal Stability**: Maintains properties at elevated temperatures 4. **Excellent Fabricability**: Good welding and forming characteristics 5. **Low Corrosion Rate**: Minimal material loss in aggressive environments 6. **Versatile Application Range**: Suitable for various acid processing applications 7. **As-Welded Performance**: Maintains corrosion resistance without post-weld heat treatment --- **Conclusion** Alloy B-2 (UNS N10665) represents a specialized nickel-molybdenum alloy engineered specifically for handling the most challenging reducing corrosive environments. Its optimized chemical composition, featuring high molybdenum content with controlled levels of iron and silicon, provides exceptional resistance to hydrochloric acid and other reducing media. The alloy's excellent combination of mechanical properties, fabricability, and proven corrosion performance makes it an ideal choice for critical applications in chemical processing, pharmaceutical manufacturing, and industrial acid handling. Supported by comprehensive ASME standards and rigorous quality requirements, Alloy B-2 continues to provide reliable, long-term performance in some of the most aggressive industrial environments, offering engineers and designers a trusted solution for demanding corrosion challenges.

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 3434 gallon liquid totes Special package is available on request.