N-12MV Cast UNS N30012 Severe Corrosion and Heat Resistant Alloy,1

### **Product Datasheet: N-12MV Cast Nickel Alloy (UNS N30012)** **A Low-Carbon Nickel-Molybdenum Casting Alloy for Severe Corrosion Applications** --- #### **1. Overview** **N-12MV** (UNS N30012) is a low-carbon, nickel-molybdenum casting alloy designed to provide exceptional corrosion resistance in the most severe reducing environments. As the cast equivalent of wrought HASTELLOY® B-2 alloy (UNS N10665), this material offers superior structural stability and resistance to knife-line and heat-affected zone attack. The alloy's optimized composition minimizes the formation of detrimental secondary phases, providing outstanding performance in hydrochloric acid, sulfuric acid, and other reducing media across a wide range of concentrations and temperatures. Its low carbon and silicon content significantly reduces carbide precipitation, ensuring excellent corrosion resistance in as-welded conditions. --- #### **2. Chemical Composition (Typical Weight %)** | Element | Content (%) | Role in the Alloy | |---------|-------------|-------------------| | **Nickel (Ni)** | Balance (~65-70) | Forms the primary corrosion-resistant matrix | | **Molybdenum (Mo)** | ~26.0-30.0 | Provides fundamental resistance to reducing acids | | **Iron (Fe)** | ≤ 2.0 | Tightly controlled to minimize secondary phase formation | | **Chromium (Cr)** | ≤ 1.0 | Deliberately minimized for reducing environments | | **Cobalt (Co)** | ≤ 1.0 | Tightly controlled residual | | **Manganese (Mn)** | ≤ 1.0 | Residual element | | **Silicon (Si)** | ≤ 0.10 | Very low to prevent intermetallic formation | | **Carbon (C)** | ≤ 0.02 | Extremely low to prevent carbide precipitation | | **Vanadium (V)** | ≤ 0.20 | Residual element | --- #### **3. Physical Properties (Typical)** | Property | Value / Condition | |----------|-------------------| | **Density** | 9.24 g/cm³ (0.334 lb/in³) | | **Melting Range** | 1330-1380 °C (2425-2515 °F) | | **Thermal Expansion Coefficient** | 10.1 μm/m·°C (20-100°C) | | **Thermal Conductivity** | 11.8 W/m·K (at 100°C) | | **Modulus of Elasticity** | 198 GPa (28.7×10⁶ psi) | | **Electrical Resistivity** | 1.37 μΩ·m | | **Specific Heat Capacity** | 375 J/kg·K (at 20°C) | --- #### **4. Mechanical Properties (As-Cast & Heat Treated)** **Solution Annealed Condition:** * **Tensile Strength**: 745-895 MPa (108-130 ksi) * **Yield Strength (0.2% Offset)**: 415-550 MPa (60-80 ksi) * **Elongation**: 8-15% * **Hardness**: 210-260 HB **High-Temperature Capability:** * Excellent strength retention up to 700°C (1290°F) * Superior thermal stability compared to earlier B-type alloys --- #### **5. Corrosion Resistance** **Exceptional Performance in:** * **Hydrochloric Acid**: Outstanding resistance across all concentrations and temperatures * **Sulfuric Acid**: Excellent performance in reducing conditions * **Phosphoric Acid**: Superior resistance in pure and contaminated acid * **Organic Acids**: Excellent resistance to formic, acetic, and other organic acids * **Chloride-Induced Stress Corrosion**: Highly resistant in reducing environments **Key Advantages over Earlier Alloys:** * Reduced susceptibility to carbide precipitation * Improved thermal stability * Better performance in as-welded conditions --- #### **6. Product Applications** **Chemical Processing Equipment:** * Hydrochloric acid synthesis and handling systems * Sulfuric acid pickling tanks and heaters * Phosphoric acid evaporators and reactors * Organic chemical synthesis reactors **Pharmaceutical Industry:** * High-purity reaction vessels * Acid handling and storage systems * Process piping and heat exchangers **Specialized Applications:** * Nuclear fuel reprocessing equipment * Acid recovery system components * Chemical distillation columns * Critical pump casings and valves --- #### **7. International Standards** * **Cast Alloy Specifications**: * **UNS N30012**: Cast alloy designation * **ASTM A494/A494M**: Standard specification for castings * **Grade N-12MV**: Commercial casting designation * **Aerospace Specification**: * **AMS 5396**: Investment castings for aerospace applications * **Wrought Equivalent**: * **UNS N10665**: Wrought HASTELLOY B-2 alloy * **ASTM B333**: Plate, sheet, and strip * **ASTM B335**: Rod and bar * **Quality Certifications**: * ASME Boiler and Pressure Vessel Code * ISO 15156 (NACE MR0175) compliance * Nuclear quality assurance standards --- **Technical Note:** N-12MV represents a significant advancement over earlier nickel-molybdenum casting alloys, with optimized chemistry that provides superior thermal stability and corrosion resistance. The extremely low carbon and silicon content prevents the formation of detrimental phases that could compromise performance in welded fabrications. Proper solution annealing is critical for achieving optimal corrosion resistance. Investment casting per AMS 5396 ensures high-integrity components for demanding aerospace and chemical processing applications. *HASTELLOY is a registered trademark of Haynes International. N-12MV is the standard ASTM designation for the low-carbon, thermally stable version of this nickel-molybdenum casting alloy.*

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 3391 gallon liquid totes Special package is available on request.