Nickel 80/Molybdenum 20 Alloy,Nickel Molybdenum Alloy.Ni20Mo Alloy，1

### **Nickel 80/Molybdenum 20 Alloy (Ni₈₀Mo₂₀) - Corrosion-Resistant Nickel-Molybdenum Alloy** #### **Overview** **Nickel 80/Molybdenum 20 Alloy** is a high-performance nickel-molybdenum alloy designed for exceptional corrosion resistance in severe reducing environments. With its substantial molybdenum content of approximately 20%, this alloy exhibits outstanding resistance to hydrochloric acid, sulfuric acid, and other non-oxidizing media, while maintaining good mechanical properties at elevated temperatures. The alloy's unique composition places it within the family of advanced nickel-molybdenum materials that bridge the gap between commercially pure nickel and more complex nickel-molybdenum-chromium systems. --- #### **Chemical Composition (Weight %)** | Element | Content (%) | Function | |---------|-------------|-----------| | **Nickel (Ni)** | **78.0-82.0%** | Base element providing corrosion resistance and matrix stability | | **Molybdenum (Mo)** | **19.0-21.0%** | Primary alloying element for resistance to reducing acids | | **Iron (Fe)** | **≤ 1.5%** | Controlled impurity | | **Chromium (Cr)** | **≤ 0.5%** | Minimized for optimal performance in reducing environments | | **Manganese (Mn)** | **≤ 0.5%** | Deoxidizer during melting | | **Silicon (Si)** | **≤ 0.5%** | Controlled impurity | | **Carbon (C)** | **≤ 0.02%** | Strictly controlled to prevent sensitization | | **Sulfur (S)** | **≤ 0.01%** | Minimized impurity | --- #### **Physical & Mechanical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | **9.24 g/cm³** | | **Melting Point** | **1350-1400°C** (2462-2552°F) | | **Electrical Resistivity** | **135-145 μΩ·cm** (at 20°C) | | **Thermal Conductivity** | **11.5-13.5 W/m·K** (at 20°C) | | **Coefficient of Thermal Expansion** | **11.0-12.0 × 10⁻⁶/°C** (20-300°C) | | **Specific Heat Capacity** | **380-420 J/kg·K** | | **Tensile Strength** | **750-900 MPa** (annealed condition) | | **Yield Strength (0.2% Offset)** | **350-450 MPa** (annealed condition) | | **Elongation** | **40-50%** (annealed condition) | | **Modulus of Elasticity** | **210-230 GPa** | | **Hardness** | **180-220 HV** (annealed condition) | | **Creep Strength** | **Good up to 800°C** (1472°F) | --- #### **Corrosion Resistance Properties** | Environment | Performance | |-------------|-------------| | **Hydrochloric Acid** | **Excellent resistance at all concentrations and temperatures** | | **Sulfuric Acid** | **Outstanding performance in non-oxidizing concentrations** | | **Phosphoric Acid** | **Excellent resistance** | | **Organic Acids** | **Superior performance in formic, acetic, and other organic acids** | | **Chloride Solutions** | **Excellent resistance to stress corrosion cracking** | | **Oxidizing Environments** | **Limited resistance - requires careful evaluation** | --- #### **Key Characteristics & Applications** **Key Characteristics:** - **Exceptional Reducing Acid Resistance**: Superior performance in hydrochloric, sulfuric, and phosphoric acids - **Good Thermal Stability**: Maintains properties at elevated temperatures - **Excellent Mechanical Properties**: High strength with good ductility - **Fabricability**: Can be welded and formed using standard techniques - **Oxidation Sensitivity**: Requires protection in oxidizing environments - **Cost-Effective Alternative**: More economical than higher-alloyed nickel-molybdenum-chromium grades **Typical Applications:** - **Chemical Processing**: Reactors, vessels, and piping for hydrochloric acid service - **Pharmaceutical Industry**: Equipment for acid handling and processing - **Petrochemical**: Components exposed to reducing acid environments - **Acid Production**: Equipment for manufacturing and handling mineral acids - **Pollution Control**: Scrubbers and waste treatment systems - **Laboratory Equipment**: Apparatus for chemical analysis and research - **Heat Exchangers**: Tubes and plates for corrosive service --- #### **International Standards & Specifications** | Standard | Designation | Description | |----------|-------------|-------------| | **ASTM** | **B333** | Standard specification for nickel-molybdenum alloy plate, sheet, and strip | | **ASTM** | **B335** | Standard for nickel-molybdenum alloy rod and bar | | **UNS** | **N10665** | Unified Numbering System designation | | **ASME** | **SB-333** | Boiler and Pressure Vessel Code specification | | **DIN** | **2.4617** | German standard designation | | **ISO** | **6208** | International standard for nickel-molybdenum alloys | --- #### **Manufacturing & Processing** **Available Forms:** - **Plate and Sheet**: 0.5 mm to 100 mm thickness - **Rod and Bar**: 3 mm to 300 mm diameter - **Pipe and Tube**: 6 mm to 300 mm OD - **Wire**: 0.5 mm to 10 mm diameter - **Forgings**: Custom shapes and components - **Fittings**: Flanges, elbows, and other piping components **Processing Guidelines:** - **Hot Working**: 1150-1200°C (2102-2192°F) with rapid cooling - **Cold Working**: Good capability with intermediate annealing - **Annealing**: 1150-1175°C (2102-2147°F) followed by rapid cooling - **Welding**: All standard methods applicable with matching filler metals - **Machining**: Similar to other nickel-based alloys --- #### **Quality Control & Testing** - **Chemical Analysis**: Per ASTM E1473 - **Mechanical Testing**: Per ASTM E8/E8M - **Corrosion Testing**: Per ASTM G28 Method A - **Non-Destructive Testing**: UT, RT, PT as required - **Metallographic Examination**: Per ASTM E3 --- #### **Comparison with Related Alloys** | Property | Ni₈₀Mo₂₀ | Ni₆₀Mo₂₀Fe₂₀ (Hastelloy B-2) | Ni₆₅Mo₂₈Fe₅V (Hastelloy B-3) | |----------|-----------|-------------------------------|-------------------------------| | **Molybdenum Content** | 19-21% | 26-30% | 27-32% | | **Corrosion Resistance** | Very Good | Excellent | Superior | | **Thermal Stability** | Good | Very Good | Excellent | | **Cost** | Lower | Higher | Highest | --- #### **Summary** **Nickel 80/Molybdenum 20 Alloy** represents a strategically important material in the nickel-molybdenum alloy family, offering an optimal balance of corrosion resistance, mechanical properties, and cost-effectiveness. Its exceptional performance in reducing acid environments, particularly hydrochloric and sulfuric acids, makes it invaluable for chemical processing, pharmaceutical, and petrochemical applications. While it may not offer the ultimate corrosion resistance of higher-alloyed grades, its well-balanced properties and established manufacturing base ensure its continued relevance in applications where severe reducing conditions are encountered. The comprehensive international standards and proven service performance make Ni₈₀Mo₂₀ a reliable choice for demanding industrial applications requiring robust corrosion resistance combined with good mechanical properties.

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 3229 gallon liquid totes Special package is available on request.