Alloy 405,Monel 405,UNS N04405,EFORU

**Product Data Sheet: Alloy 405 / Monel 405 (UNS N04405)**   

 **1. Overview**   Alloy 405 (UNS N04405), commercially known as Monel 405, is a free-machining variant of the nickel-copper alloy Monel 400. The key difference is the intentional addition of sulfur, which enhances machinability while maintaining similar corrosion resistance and mechanical properties. This alloy is specifically designed for applications requiring extensive machining operations, offering improved productivity in manufacturing processes. 

 **2. International Standards**   

- **ASTM Standards**: B164 (Rod, Bar, Wire)   

- **ASME Standards**: SB-164   

- **EN/DIN Standards**: 2.4360 (similar base composition)   

- **Other**: UNS N04405, AMS 4674 (Aerospace Material Specification)   

- **Machinability Rating**: 20% (based on 100% for free-cutting brass)  

 **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    |   

| **Sulfur (S)** | **0.025** | **0.060** |   

| Carbon (C)     | -      | 0.3    |   

| Silicon (Si)   | -      | 0.5    |   

 **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        | 0.54 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              | 480-550 MPa (70-80 ksi)        |  

| Yield Strength (0.2% Offset)  | 170-310 MPa (25-45 ksi)        |   

| Elongation (in 50 mm)         | 35-40%                         |   

| Hardness (Rockwell B)         | 65-80 HRB                       |   

| **Machinability**             | **Excellent (with sulfur inclusions)** |  

 **6. Product Forms**   

- Round Bar, Hex Bar, Square Bar   

- Wire and Wire Rods   

- Fasteners (bolts, screws, nuts)   

- Custom machined components   

 **7. Applications**   

- **Automated Machining**: Screw machine products, high-volume turned parts   

- **Fastener Industry**: Bolts, nuts, screws for marine and chemical environments   

- **Valve Components**: Valve stems, seats, and trim parts   

- **Pump Parts**: Shafts, impellers, bushings requiring machining   

- **Marine Engineering**: Machined components for seawater systems   

 **8. Corrosion Resistance**   

- Similar to Monel 400: excellent resistance to seawater and brine solutions   

- Good resistance to sulfuric acid, hydrofluoric acid, and alkaline solutions   

- Not recommended for oxidizing acids (e.g., nitric acid)   

- Slightly reduced corrosion resistance in some environments due to sulfur content   

 **9. Fabrication Notes**   

- **Machining**: Excellent machinability; use high-speed steel or carbide tools   

- **Welding**: Not recommended for fusion welding due to hot cracking susceptibility   

- **Hot Working**: Suitable for hot forging and forming (900-1150°C)   

- **Cold Working**: Good ductility for cold forming operations   

 **10. Special Considerations**   

- Sulfur addition improves chip-breaking characteristics during machining   

- Not suitable for high-temperature applications above 400°C (750°F)   

- Avoid use in nuclear applications due to sulfur content   

- Stress relief annealing recommended after severe cold working   

 **11. Comparison with Monel 400**   

- Monel 405 offers superior machinability but slightly reduced weldability   

- Mechanical properties and corrosion resistance are largely comparable   

- Monel 405 is preferred for parts requiring extensive machining operations  

Packing of Alloy 405,Monel 405,UNS N04405

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 1628 gallon liquid totes Special package is available on request.