MONEL Alloy 400,nickel-copper alloy, ，1

### **Product Introduction: MONEL® Alloy 400** **MONEL® Alloy 400** is a premier nickel-copper alloy known for its exceptional corrosion resistance in a wide range of environments, including seawater, hydrofluoric acid, and alkaline solutions. It offers high strength and toughness over a broad temperature range, from cryogenic conditions up to about 1000°F (538°C). This combination of properties makes it a versatile and reliable material for demanding applications in marine, chemical, and hydrocarbon processing industries. As a solid-solution alloy, it can be strengthened only by cold working, maintaining good ductility and fabricability in the annealed condition. --- ### **International Standards & Material Equivalents** MONEL® Alloy 400 is standardized across all major international specifications. | Standard Type | Standard Number | Designation | | :--- | :--- | :--- | | **UNS (USA)** | **N04400** | Alloy 400 | | **ASTM (USA)** | B127 | Plate, Sheet, and Strip | | **ASTM (USA)** | B164 | Rod and Bar | | **ASTM (USA)** | B165 | Seamless Pipe and Tube | | **DIN (Germany)** | 17743 | NiCu30Fe | | **Werkstoff Nr.** | **2.4360** | 2.4360 | | **EN (Europe)** | EN 10095 | NiCu30Fe | | **BS (UK)** | BS 3075 | NA 13 | | **JIS (Japan)** | H4551 | NMCu 28-2.5-1.5 | > **Note:** MONEL® is a registered trademark of Special Metals Corporation (now part of rolledAlloys). The generic name is often written as "Alloy 400" or "Ni-Cu Alloy 400". --- ### **Chemical Composition** The composition is precisely balanced to provide its signature corrosion resistance and mechanical properties. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 63.0 min. | | **Copper (Cu)** | 28.0 - 34.0 | | **Iron (Fe)** | 2.5 max. | | **Manganese (Mn)** | 2.0 max. | | **Carbon (C)** | 0.3 max. | | **Silicon (Si)** | 0.5 max. | | **Sulfur (S)** | 0.024 max. | --- ### **Physical Properties** MONEL Alloy 400 possesses a set of physical properties that support its use in various engineering applications. | Property | Value | | :--- | :--- | | **Density** | 8.80 g/cm³ (0.318 lb/in³) | | **Melting Point** | 1350 °C (2460 °F) | | **Thermal Conductivity** | 22 W/m·K (at 20°C) | | **Electrical Resistivity** | 0.51 μΩ·m (at 20°C) | | **Modulus of Elasticity** | 179 GPa (26 x 10⁶ psi) | | **Magnetic Response** | Essentially non-magnetic at ambient temperatures | --- ### **Mechanical Properties (Typical for Annealed Condition)** Mechanical properties vary with product form and temper. The following are typical for annealed material. | Property | Value (Annealed) | | :--- | :--- | | **Tensile Strength** | 550 MPa (80 ksi) | | **Yield Strength (0.2% Offset)** | 240 MPa (35 ksi) | | **Elongation** | 40% | | **Hardness (Rockwell B)** | 65 - 75 HRB | --- ### **Key Characteristics & Advantages** 1. **Excellent Corrosion Resistance:** Its most renowned feature. It resists: * **Seawater and Salt Solutions:** Highly resistant to chloride-induced stress corrosion cracking and erosion. * **Hydrofluoric Acid:** One of the few metallic materials resistant to all concentrations of HF, especially in the absence of air. * **Alkalis:** Excellent resistance to caustic solutions. * **Sulfuric and Hydrochloric Acids:** Performs well under reducing conditions. 2. **High Strength and Toughness:** Maintains good mechanical properties from sub-zero temperatures to moderately high temperatures. 3. **Good Fabricability:** Can be readily fabricated and welded using techniques common to nickel alloys. 4. **Low Magnetic Permeability:** Essential for marine applications requiring non-magnetic components. --- ### **Product Applications** MONEL Alloy 400 is specified across numerous critical industries due to its unparalleled performance in corrosive environments. * **Marine Engineering:** * Pump shafts, propeller shafts, and fasteners. * Marine fixtures, valves, and piping systems. * Seawater cooling and heat exchanger components. * **Chemical and Hydrocarbon Processing:** * Process vessels, columns, and heat exchangers. * Piping and transfer systems for corrosive chemicals. * Components for HF alkylation units. * **Oil & Gas:** * Wellhead components, downhole tools, and umbilicals. * Brine and production piping. * **Other Applications:** * Feedwater heaters in power plants. * Musical instruments (e.g., saxophone bodies). * Architectural and consumer applications for its attractive silver appearance. ### **Summary** **MONEL Alloy 400 (UNS N04400 / Werkstoff 2.4360)** stands as a cornerstone material in corrosion engineering. Its unique nickel-copper composition delivers a robust combination of strength, fabricability, and exceptional resistance to a vast spectrum of corrosive media, from seawater to harsh chemicals. Governed by a comprehensive set of international standards like **ASTM B127** and **DIN 17743**, it remains a trusted and widely specified alloy for solving the most challenging corrosion problems worldwide.

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 3291 gallon liquid totes Special package is available on request.