Alloy 400,Monel 400,UNS N04400,EFORU

**Product Data Sheet: Alloy 400 / Monel 400 (UNS N04400)**   

 **1. Overview**   Alloy 400 (UNS N04400), commonly known as Monel 400, is a nickel-copper alloy renowned for its excellent corrosion resistance in a wide range of environments, including seawater, acids, and alkalis. It exhibits high strength and toughness over a broad temperature range, from cryogenic to elevated temperatures (~540°C/1000°F). The alloy offers good weldability and fabricability, making it suitable for demanding applications in marine, chemical, and oil & gas industries. 

 **2. International Standards**   

- **ASTM Standards**: B127 (Plate/Sheet/Strip), B164 (Rod/Bar), B165 (Seamless Pipe/Tube)   

- **ASME Standards**: SB-127, SB-164, SB-165   

- **EN/DIN Standards**: 2.4360 (EN), NiCu30Fe (DIN)   

- **Other**: UNS N04400, AWS ERNiCu-7 (Welding Wire)   

 **3. Chemical Composition (wt%)**  

 | Element        | Min.   | Max.   |   

|----------------|--------|--------|   

| Nickel (Ni)    | 63.0   | 70.0   |   

| Copper (Cu)    | 28.0   | 34.0   |   

| Iron (Fe)      | -      | 2.5    |   

| Manganese (Mn) | -      | 2.0    |   

| Carbon (C)     | -      | 0.3    |  

 | Silicon (Si)   | -      | 0.5    |   

| Sulfur (S)     | -      | 0.024  |  

 **4. Physical Properties**  

| Property                      | Value                           |   

|-------------------------------|---------------------------------|   

| Density                       | 8.80 g/cm³ (0.319 lb/in³)      |   

| Melting Point                 | 1350-1380°C (2460-2510°F)      |   

| Thermal Conductivity          | 21.8 W/m·K (at 100°C)          |   

| Electrical Resistivity        | 0.51 μΩ·m (at 20°C)            |   

| Coefficient of Thermal Expansion | 13.9 μm/m·°C (20-100°C)    |   

| Magnetic Permeability         | ~1.01 (slightly magnetic)      |   

 **5. Mechanical Properties (Typical Annealed Condition)**   

| Property                      | Value                           |   

|-------------------------------|---------------------------------|   

| Tensile Strength              | 480-620 MPa (70-90 ksi)        |   

| Yield Strength (0.2% Offset)  | 170-345 MPa (25-50 ksi)        |   

| Elongation (in 50 mm)         | 35-45%                         |   

| Hardness (Rockwell B)         | 65-85 HRB                       |   

 **6. Product Forms**   

- Plate, Sheet, Strip   

- Round Bar, Hex Bar, Wire   

- Seamless and Welded Pipes & Tubes   

- Forgings, Fittings, Fasteners   

 **7. Applications**   

- **Marine Engineering**: Pump shafts, propeller shafts, seawater valves, fasteners   

- **Chemical Processing**: Reactor vessels, heat exchangers, piping for acids and alkalis   

- **Oil & Gas**: Wellhead components, casing seals, downhole equipment   

- **Power Generation**: Feedwater heaters, turbine blades   

- **Aerospace**: Aircraft fuel tanks, hydraulic systems   

 **8. Corrosion Resistance**   

- Excellent resistance to seawater and salt solutions   

- Good performance in sulfuric/hydrochloric acids under reducing conditions   

- Resistant to alkaline solutions, hydrofluoric acid, and fluorine gas   

- Limited resistance to oxidizing acids (e.g., nitric acid)   

 **9. Fabrication Notes**   

- **Welding**: Suitable for TIG, MIG, and SMAW processes (use Monel 60 or ERNiCu-7 filler)   

- **Machining**: Use slow speeds, high feed rates, and positive rake angles   

- **Annealing**: 870-980°C (1600-1800°F) followed by rapid cooling   

 **10. Advantages over Other Alloys**   

- Superior to stainless steels in chloride-induced stress corrosion cracking environments   

- Higher strength than pure nickel/copper alloys   

- Maintains properties at sub-zero temperatures  

Packing of Alloy 400,Monel 400,UNS N04400

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 1627 gallon liquid totes Special package is available on request.