Alloy B-2,Hastelloy B-2,，EFORU

### **Alloy B-2 / Hastelloy® B-2 (UNS N10665) - Technical Datasheet** --- #### **1. Overview** **Hastelloy® B-2** is a nickel-molybdenum alloy specifically designed to offer exceptional resistance to reducing corrosive environments. This low-carbon, low-iron version of the original Hastelloy B alloy provides superior performance in hydrochloric acid across all concentrations and temperatures, as well as outstanding resistance to other non-oxidizing media. The alloy's optimized composition minimizes the formation of detrimental secondary phases, ensuring excellent corrosion resistance in both welded and fabricated conditions. --- #### **2. Chemical Composition (Weight %)** The composition is precisely controlled for maximum corrosion resistance. | Element | Content (%) | Role & Benefit | |---------|-------------|----------------| | **Nickel (Ni)** | Balance | Base element providing fundamental corrosion resistance | | **Molybdenum (Mo)** | 26.0 - 30.0 | Primary element for resistance to reducing acids | | **Iron (Fe)** | 2.0 max | Deliberately minimized to prevent detrimental phase formation | | **Chromium (Cr)** | 1.0 max | Intentionally kept low for reducing environment optimization | | **Manganese (Mn)** | 1.0 max | Deoxidizer and workability agent | | **Cobalt (Co)** | 1.0 max | Controlled residual element | | **Vanadium (V)** | 0.20 max | Controlled impurity | | **Silicon (Si)** | 0.10 max | Kept very low to prevent segregation | | **Carbon (C)** | 0.02 max | Extremely low to prevent carbide precipitation | | **Sulfur (S)** | 0.02 max | Tightly controlled impurity | | **Phosphorus (P)** | 0.03 max | Controlled to prevent embrittlement | *Note: "Hastelloy" is a registered trademark of Haynes International Inc.* --- #### **3. Physical Properties** The physical properties support its use in aggressive chemical environments. | Property | Value | |----------|-------| | **Density** | 9.22 g/cm³ (0.333 lb/in³) | | **Melting Point** | 1330-1380°C (2425-2515°F) | | **Specific Heat (20°C)** | 380 J/kg·K | | **Thermal Conductivity** | 11.0 W/m·K (at 20°C) | | **Mean Coefficient of Thermal Expansion** | 10.3 × 10⁻⁶/°C (20-300°C) | | **Electrical Resistivity** | 1.35 μΩ·m | | **Modulus of Elasticity** | 210 GPa (30.5 × 10⁶ psi) | | **Magnetic Permeability** | Essentially non-magnetic | --- #### **4. Mechanical Properties** The alloy maintains good mechanical strength in corrosive environments. **Annealed Condition:** | Property | Value | |----------|-------| | **Tensile Strength** | 795-1000 MPa (115-145 ksi) | | **Yield Strength (0.2% Offset)** | 380-550 MPa (55-80 ksi) | | **Elongation** | 40-50% | | **Hardness** | 95-105 HRB | **Elevated Temperature Properties (400°C/750°F):** | Property | Value | |----------|-------| | **Tensile Strength** | 620 MPa (90 ksi) | | **Yield Strength** | 345 MPa (50 ksi) | | **Creep Strength** | 170 MPa (25 ksi) | --- #### **5. Product Applications** **Hastelloy B-2** serves in extremely aggressive reducing environments: - **Chemical Processing:** - Hydrochloric acid production and handling systems - Sulfuric acid pickling equipment (<70% concentration) - Acetic acid and anhydride production - Organic synthesis reactors - **Pharmaceutical Industry:** - Active pharmaceutical ingredient (API) manufacturing - Acid-catalyzed reaction vessels - Chlorinated intermediate processing - High-purity chemical synthesis - **Agricultural Chemicals:** - Pesticide and herbicide production - Organic chloride manufacturing - Acid handling and storage systems - **Industrial Applications:** - Heat exchangers in acid service - Pumps and valves for hydrochloric acid - Distillation columns for acid concentration - Evaporators and crystallizers --- #### **6. International Standards** The material conforms to various international specifications: | Standard | Specification | |----------|---------------| | **ASTM** | ASTM B333 - Nickel-Molybdenum Alloy Plate, Sheet, and Strip
ASTB B335 - Nickel-Molybdenum Alloy Rod
ASTM B336 - Nickel-Molybdenum Alloy Pipe | | **UNS** | UNS N10665 | | **ASME** | SB-333, SB-335, SB-336 | | **DIN** | DIN 17744 - NiMo28 | | **EN** | EN 10095 - NW 12 | | **ISO** | ISO 6208 - NiMo28 | --- #### **7. Corrosion Resistance** - **Exceptional** resistance to hydrochloric acid at all concentrations and temperatures - **Outstanding** performance in sulfuric acid (<70% concentration) - **Excellent** resistance to phosphoric, acetic, and formic acids - **Superior** performance in other non-oxidizing media - **Poor** resistance to oxidizing agents (nitric acid, ferric ions, cupric ions) - **Vulnerable** to corrosion in presence of oxidizing contaminants --- #### **8. Fabrication Characteristics** - **Machining:** Requires rigid setups and sharp, positive rake tools - **Welding:** Excellent weldability using GTAW with matching filler metal - **Forming:** Good hot working characteristics; requires care in cold forming - **Heat Treatment:** Solution anneal at 1065-1120°C (1950-2050°F) - **Cooling:** Rapid cooling from solution annealing temperature is critical --- #### **9. Special Considerations** - **Oxidizing Conditions:** Must avoid even trace oxidizing contaminants - **Thermal Stability:** Sensitive to intermetallic phase formation in 650-950°C range - **Welded Performance:** Maintains corrosion resistance in weld zones - **Service Temperature:** Maximum continuous service temperature of 400°C (750°F) --- #### **10. Summary** **Hastelloy® B-2 (UNS N10665)** represents the pinnacle of nickel-molybdenum alloys for reducing corrosive environments. Its low-carbon, low-iron composition provides exceptional resistance to hydrochloric acid and other non-oxidizing media while maintaining excellent fabricability and welded performance. The alloy's optimized chemistry minimizes susceptibility to intermetallic phase formation, ensuring reliable performance in both base metal and welded conditions. Governed by comprehensive international standards including ASTM B333-336, Hastelloy B-2 remains the material of choice for the most demanding applications in chemical processing, pharmaceutical manufacturing, and other industries where resistance to reducing acids is paramount. Its proven performance in hydrochloric acid service makes it indispensable for critical equipment handling this challenging chemical.

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 1717 gallon liquid totes Special package is available on request.