Nickelvac H-B-2 UNS N10665 Nickel Superalloy,ASTM B 333, 335, 622.,E FORU

### **Product Introduction: Nickelvac® H-B-2 (UNS N10665) Nickel-Molybdenum Superalloy** **Nickelvac H-B-2 (UNS N10665)** is a nickel-molybdenum superalloy specifically engineered for exceptional resistance to reducing chemicals and hydrochloric acid corrosion. This low-carbon, nickel-molybdenum alloy demonstrates outstanding performance in severely corrosive reducing environments, particularly in hydrochloric acid of all concentrations and temperatures. The controlled low carbon content significantly reduces carbide precipitation during welding or thermal processing, making it highly suitable for as-welded applications in aggressive chemical environments. The alloy exhibits excellent thermal stability and maintains good mechanical properties across a wide temperature range, from cryogenic conditions up to 400°C (750°F), while providing superior resistance to stress corrosion cracking and localized corrosion attack. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of Nickelvac H-B-2 per ASTM B333 is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | Balance | **Iron (Fe)** | 2.0 max | | **Molybdenum (Mo)** | 26.0 - 30.0 | **Chromium (Cr)** | 1.0 max | | **Cobalt (Co)** | 1.0 max | **Manganese (Mn)** | 1.0 max | | **Vanadium (V)** | 0.40 max | **Silicon (Si)** | 0.10 max | | **Carbon (C)** | 0.02 max | **Phosphorus (P)** | 0.04 max | | **Sulfur (S)** | 0.03 max | **Tungsten (W)** | 1.0 max | --- #### **2. Physical & Mechanical Properties** **Physical Properties:** | Property | Metric Units | Imperial Units | |----------|-----------------|------| | **Density** | 9.22 g/cm³ | 0.333 lb/in³ | | **Melting Range** | 1330 - 1380 °C | 2426 - 2516 °F | | **Thermal Conductivity** | 10.8 W/m·K | 74.9 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 10.3 μm/m·°C | 5.7 μin/in·°F | | **Modulus of Elasticity** | 217 GPa | 31.5 x 10⁶ psi | | **Specific Heat** | 380 J/kg·K | 0.091 Btu/lb·°F | **Mechanical Properties (Annealed Condition):** | Property | Value | |----------|-----------------| | **Tensile Strength** | 1100 MPa | 160 ksi | | **Yield Strength (0.2% Offset)** | 760 MPa | 110 ksi | | **Elongation** | 40% | | **Hardness (Rockwell B)** | 95 HRB | **Elevated Temperature Properties (at 400°C/750°F):** | **Tensile Strength** | 860 MPa | 125 ksi | | **Yield Strength** | 550 MPa | 80 ksi | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Exceptional Reducing Media Resistance**: Outstanding performance in hydrochloric acid and other reducing chemicals - **Low Carbon Content**: Minimizes carbide precipitation during welding and thermal processing - **Excellent Thermal Stability**: Maintains corrosion resistance and mechanical properties at elevated temperatures - **Good Fabricability**: Can be welded and formed using standard techniques - **Resistance to Localized Corrosion**: Good performance against pitting and crevice corrosion - **Chloride Stress Corrosion Cracking Resistance**: Excellent performance in chloride-containing environments **Product Applications:** Nickelvac H-B-2 serves critical functions in demanding chemical processing applications: - **Chemical Processing Industry**: - Hydrochloric acid production and handling equipment - Reactors and vessels for organic chemical synthesis - Pumps and valves for corrosive chemical service - Heat exchangers and condensers in acid service - **Pharmaceutical Manufacturing**: - Reaction vessels for active pharmaceutical ingredients - Chemical synthesis equipment - High-purity chemical processing systems - **Acid Production and Handling**: - Sulfuric acid pickling equipment - Acid recovery systems - Chemical storage and transportation equipment - **Industrial Processing**: - Catalyst support systems - Chemical reactor internals - Process piping and ducting systems --- #### **4. International Standards & Specifications** Nickelvac H-B-2 is comprehensively covered by international standards: **ASTM Standards:** - **ASTM B333**: Plate, Sheet, and Strip - **ASTM B335**: Rod - **ASTM B622**: Seamless Pipe and Tube **Other International Standards:** - **UNS**: N10665 - **ASME**: SB-333, SB-335, SB-622 - **EN**: 2.4617 (NiMo28) - **DIN**: 2.4617 - **ISO**: 6207 (NW 10665) - **JIS**: NW 10665 --- #### **Summary of Key Advantages** - **Superior Reducing Corrosion Resistance**: Exceptional performance in hydrochloric acid and reducing environments - **Optimized Low Carbon Chemistry**: Minimizes sensitization during welding and thermal processing - **Excellent Mechanical Properties**: Good strength and ductility across wide temperature range - **Proven Reliability**: Extensive successful service history in severe chemical environments - **Good Fabricability**: Suitable for manufacturing complex components and equipment - **Comprehensive Standardization**: Covered by complete suite of international specifications **Technical Note**: Nickelvac H-B-2 requires careful control of welding parameters to maintain optimal corrosion resistance. Recommended welding processes include GTAW with matching filler metal. The alloy is susceptible to formation of grain boundary precipitates in the temperature range of 550-850°C (1020-1560°F), which can affect both corrosion resistance and mechanical properties. Proper solution annealing at 1150°C (2100°F) followed by rapid cooling is essential to maintain optimum performance. The material demonstrates good cold working characteristics, though intermediate annealing may be required for severe forming operations.

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 3161 gallon liquid totes Special package is available on request.