MONEL Alloy 450,ASME SB-111, ，1

### **Product Introduction: Copper-Nickel Alloy UNS C71500 (Commonly Referenced as MONEL® Alloy 450)** **Copper-Nickel Alloy UNS C71500**, often historically or informally referred to in some contexts as **MONEL Alloy 450**, is a 70-30 copper-nickel alloy known for its outstanding resistance to seawater corrosion, macrofouling, and erosion-corrosion. It offers excellent fabricability and high strength, making it one of the most important and widely used alloys for marine engineering and desalination applications. It is crucial to clarify that the common "MONEL" brand, owned by Special Metals Corporation, typically refers to nickel-copper alloys where nickel is the primary element (e.g., MONEL 400). **UNS C71500 is fundamentally a copper-nickel alloy** (copper-base), and its association with the "MONEL" name is less standard. The correct generic name is **70-30 CuNi** or **Copper-Nickel Alloy C71500**. --- ### **International Standards & Material Equivalents** This alloy is standardized globally, with ASME SB-111 being a key specification for its tubular form. | Standard Type | Standard Number | Designation / Title | | :--- | :--- | :--- | | **UNS (USA)** | **C71500** | Copper-Nickel Alloy, 70-30 | | **ASME/ASTM (USA)** | **SB-111 / B111** | Copper and Copper-Alloy Seamless Condenser and Heat Exchanger Tubes | | **ASME/ASTM (USA)** | B171 | Copper-Alloy Plate and Sheet for Pressure Vessels | | **ASME/ASTM (USA)** | B466 | Seamless Copper-Nickel Pipe and Tube | | **DIN (Germany)** | 17664 | CuNi30Fe | | **Werkstoff Nr.** | **2.0882** | 2.0882 | | **EN (Europe)** | EN 12451 | CuNi30Fe | | **BS (UK)** | BS 2871 | CN 107 | > **Note:** The primary identifier is **UNS C71500**. **ASME SB-111/B111** is the critical standard for its most common application: seamless tubes for heat exchangers and condensers. --- ### **Chemical Composition** The composition is balanced to optimize corrosion resistance and mechanical properties. | Element | Content (%) | | :--- | :--- | | **Copper (Cu)** | Balance | | **Nickel (Ni)** | 29.0 - 33.0 | | **Iron (Fe)** | 0.40 - 1.0 | | **Manganese (Mn)** | 0.40 - 1.0 | | **Zinc (Zn)** | 1.0 max. | | **Lead (Pb)** | 0.05 max. | | **Carbon (C)** | 0.05 max. | | **Other Impurities** | 0.2 max. | --- ### **Physical Properties** The physical properties of C71500 make it an excellent heat exchanger material. | Property | Value | | :--- | :--- | | **Density** | 8.94 g/cm³ (0.323 lb/in³) | | **Melting Point (Liquidus)** | 1237 °C (2258 °F) | | **Thermal Conductivity** | 29 W/m·K (at 20°C) | | **Electrical Resistivity** | 0.40 μΩ·m (at 20°C) | | **Modulus of Elasticity** | 156 GPa (22.6 x 10⁶ psi) | | **Coefficient of Thermal Expansion** | 16.2 μm/m·°C (20-300°C) | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties (Typical for Annealed Condition)** Properties can vary with product form and temper. | Property | Value (Annealed) | | :--- | :--- | | **Tensile Strength** | 370 - 470 MPa (54 - 68 ksi) | | **Yield Strength (0.2% Offset)** | 125 - 200 MPa (18 - 29 ksi) | | **Elongation** | 35% - 45% | | **Hardness (Rockwell B)** | 40 - 65 HRB | --- ### **Key Characteristics & Advantages** 1. **Superior Resistance to Seawater Corrosion:** Excellent resistance to impingement corrosion, crevice corrosion, and stress-corrosion cracking in polluted and high-velocity seawater. 2. **Excellent Biofouling Resistance:** The copper content provides inherent resistance to marine organism attachment (macrofouling), reducing maintenance. 3. **Good Erosion-Corrosion Resistance:** Highly resistant to the damaging effects of high-velocity, turbulent water, making it ideal for condenser and heat exchanger tubes. 4. **High Thermal Conductivity:** Combined with its corrosion resistance, this makes it a premier material for heat transfer applications in marine environments. 5. **Good Fabricability and Weldability:** Can be readily fabricated, formed, and welded using common techniques for copper-nickel alloys. --- ### **Product Applications** The primary use of UNS C71500 is in marine and industrial water systems. * **Marine Engineering:** * **Seawater Condenser and Heat Exchanger Tubes** (as per **ASME SB-111**). * Desalination plant tubing and piping systems. * Shipboard piping for firefighting, bilge, ballast, and sanitary systems. * Propeller shafts, pump shafts, and valve components. * **Power Generation:** * Surface condensers and feedwater heaters in coastal power stations. * **Oil & Gas:** * Offshore platform piping systems for seawater cooling and water injection. * Ballast water piping. * **Chemical Processing:** * Equipment handling brines, chlorides, and other non-oxidizing chemicals. ### **Summary** **Copper-Nickel Alloy UNS C71500** (historically referenced as MONEL 450) is a cornerstone material for marine and industrial water systems. Its **70-30 copper-nickel composition**, standardized under **ASME SB-111** for tubular products, provides an unmatched combination of corrosion resistance, biofouling resistance, and excellent heat transfer capabilities. While its nomenclature may be confused with nickel-based MONEL alloys, its performance in seawater is unequivocal, making it the global standard for reliable and long-lasting service in the world's most challenging water-corrosion environments.

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 3294 gallon liquid totes Special package is available on request.