Hastelloy B-2 alloy,1

### **Hastelloy® B-2 Alloy (UNS N10665) - Nickel-Molybdenum Corrosion-Resistant Alloy** #### **Overview** **Hastelloy® B-2 Alloy** is a specialized nickel-molybdenum alloy specifically engineered to provide exceptional resistance to reducing chemicals, particularly hydrochloric acid at all concentrations and temperatures. This low-carbon, low-iron, and low-silicon version of the original Hastelloy B alloy offers improved thermal stability and reduced susceptibility to carbide precipitation during welding or thermal processing, making it ideal for highly corrosive chemical processing applications. --- #### **Chemical Composition (Weight %)** | Element | Content (%) | Function | |---------|-------------|-----------| | **Nickel (Ni)** | **Balance** | **Base element providing corrosion resistance** | | **Molybdenum (Mo)** | **26.0-30.0** | **Primary element for resistance to reducing acids** | | **Iron (Fe)** | **≤ 2.0** | **Controlled to minimize impurity effects** | | **Chromium (Cr)** | **≤ 1.0** | **Minimized for optimal performance in reducing environments** | | **Cobalt (Co)** | **≤ 1.0** | **Controlled impurity** | | **Manganese (Mn)** | **≤ 1.0** | **Deoxidizer** | | **Vanadium (V)** | **≤ 0.20** | **Controlled impurity** | | **Silicon (Si)** | **≤ 0.10** | **Minimized to prevent intermetallic formation** | | **Carbon (C)** | **≤ 0.02** | **Strictly controlled to prevent carbide precipitation** | | **Tungsten (W)** | **≤ 0.50** | **Controlled impurity** | | **Phosphorus (P)** | **≤ 0.040** | **Controlled impurity** | | **Sulfur (S)** | **≤ 0.030** | **Controlled impurity** | --- #### **Physical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | **9.22 g/cm³ (0.333 lb/in³)** | | **Melting Range** | **1330-1380°C (2426-2516°F)** | | **Electrical Resistivity** | **1.37 μΩ·m** | | **Thermal Conductivity** | **10.8 W/m·K (at 100°C)** | | **Coefficient of Thermal Expansion** | **10.3 μm/m·°C (20-100°C)** | | **Specific Heat Capacity** | **380 J/kg·K** | | **Magnetic Permeability** | **< 1.001 (essentially non-magnetic)** | --- #### **Mechanical Properties (Annealed Condition)** | Temperature | Tensile Strength | Yield Strength (0.2%) | Elongation | |-------------|------------------|---------------------|------------| | **Room Temperature** | **965 MPa (140 ksi)** | **415 MPa (60 ksi)** | **55%** | | **200°C (392°F)** | **895 MPa (130 ksi)** | **380 MPa (55 ksi)** | **50%** | | **400°C (752°F)** | **825 MPa (120 ksi)** | **345 MPa (50 ksi)** | **45%** | | **600°C (1112°F)** | **690 MPa (100 ksi)** | **310 MPa (45 ksi)** | **40%** | --- #### **Corrosion Resistance Performance** | Environment | Concentration | Temperature | Performance | |-------------|---------------|-------------|-------------| | **Hydrochloric Acid** | **All concentrations** | **Up to boiling point** | **Excellent** | | **Sulfuric Acid** | **All concentrations** | **Up to 70°C (160°F)** | **Excellent** | | **Phosphoric Acid** | **All concentrations** | **Up to boiling point** | **Excellent** | | **Acetic Acid** | **All concentrations** | **Up to boiling point** | **Excellent** | | **Hydrogen Chloride Gas** | **Dry and wet** | **All temperatures** | **Excellent** | --- #### **Key Characteristics & Applications** **Key Characteristics:** - **Exceptional Reducing Acid Resistance**: Superior performance in hydrochloric acid environments - **Low Carbon Content**: Minimizes carbide precipitation during welding - **Good Thermal Stability**: Maintains properties at elevated temperatures - **Excellent Fabricability**: Can be formed and welded using standard techniques - **Limited Oxidizing Resistance**: Not recommended for oxidizing conditions - **Good Stress Corrosion Cracking Resistance**: Performs well in chloride environments **Typical Applications:** - **Chemical Processing**: Reactors, vessels, and piping for hydrochloric acid service - **Pharmaceutical Industry**: Reaction vessels and acid handling equipment - **Acid Production**: Equipment for manufacturing and handling mineral acids - **Organic Chemical Synthesis**: Reactors and distillation columns - **Pulp and Paper Industry**: Digester and bleaching system components - **Metal Pickling**: Equipment for acid pickling operations - **Fine Chemical Production**: Specialized reaction equipment --- #### **International Standards & Specifications** | Standard | Designation | Description | |----------|-------------|-------------| | **UNS** | **N10665** | **Unified Numbering System** | | **ASME** | **SB-333** | **Plate, Sheet, and Strip** | | **ASME** | **SB-335** | **Rod and Bar** | | **ASME** | **SB-619** | **Welded Pipe and Tube** | | **ASME** | **SB-622** | **Seamless Pipe and Tube** | | **ASME** | **SB-626** | **Welded Tube** | | **ASTM** | **B333** | **Plate, Sheet, and Strip** | | **ASTM** | **B335** | **Rod and Bar** | | **DIN** | **2.4617** | **German Standard** | --- #### **Manufacturing & Processing** **Available Forms:** - **Plate and Sheet**: 0.5 mm to 100 mm thickness - **Bar and Rod**: 3 mm to 300 mm diameter - **Pipe and Tube**: 6 mm to 600 mm diameter - **Wire and Strip**: Various sizes for specialized applications - **Fittings and Flanges**: Complete piping system components **Processing Guidelines:** - **Hot Working**: 1150-1200°C (2100-2190°F) - **Cold Working**: Good capability with intermediate annealing - **Annealing**: 1065-1120°C (1950-2050°F) with rapid cooling - **Welding**: Excellent weldability using GTAW, GMAW with matching filler metals - **Machining**: Similar to other nickel-based alloys --- #### **Heat Treatment & Microstructural Control** | Process | Temperature Range | Purpose | |---------|------------------|---------| | **Solution Annealing** | **1065-1120°C** | **Dissolve precipitates and restore corrosion resistance** | | **Stress Relieving** | **870-900°C** | **Reduce residual stresses** | | **Stabilization Anneal** | **980°C** | **Prevent subsequent age hardening** | --- #### **Quality Control & Testing** - **Chemical Analysis**: Per ASTM E1473 - **Mechanical Testing**: Per ASTM E8/E8M - **Corrosion Testing**: ASTM G28 Method A for critical applications - **Non-Destructive Testing**: UT, RT, PT as required - **Metallographic Examination**: Per ASTM E3 for microstructure evaluation - **Hardness Testing**: Per ASTM E10 and E18 --- #### **Comparison with Competitive Alloys** | Property | B-2 | B-3 | C-276 | Pure Nickel | |----------|-----|-----|-------|-------------| | **HCl Resistance** | **Excellent** | **Excellent** | Good | Good | | **Oxidizing Media** | **Poor** | **Poor** | **Excellent** | Poor | | **Fabricability** | **Good** | **Good** | **Excellent** | Excellent | | **Cost Effectiveness** | **High** | **High** | Medium | Low | --- #### **Summary** **Hastelloy® B-2 Alloy (UNS N10665)** represents a specialized corrosion-resistant material optimized for service in severe reducing environments, particularly hydrochloric acid and other non-oxidizing acids. Its low carbon composition minimizes susceptibility to intergranular corrosion in the as-welded condition, while the high molybdenum content provides exceptional resistance to localized corrosion and general attack in reducing media. Supported by comprehensive ASME standardization (SB-333, SB-335, SB-619, SB-622, SB-626), this alloy delivers reliable performance in demanding chemical processing applications where conventional stainless steels and even many nickel-based alloys would rapidly deteriorate. While limited in oxidizing environments, its unparalleled performance in reducing conditions has established it as the material of choice for hydrochloric acid service and related applications across the chemical processing, pharmaceutical, and acid production industries.

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 3246 gallon liquid totes Special package is available on request.