Alloy K500,Monel K500,UNS N05500,EFORU

**Product Data Sheet: Alloy K-500 / Monel K-500 (UNS N05500)**   

 **1. Overview**   Alloy K-500 (UNS N05500), commonly known as Monel K-500, is a precipitation-hardenable nickel-copper alloy with the addition of aluminum and titanium. It combines the excellent corrosion resistance of Monel 400 with significantly higher strength and hardness achieved through age-hardening heat treatment. This alloy maintains good ductility and toughness over a wide temperature range, making it suitable for demanding applications in marine, oil and gas, and aerospace industries. 

 **2. International Standards**   

- **ASTM Standards**: B865 (Forgings), B366 (Fittings), B564 (Forgings)   

- **ASME Standards**: SB-865, SB-366, SB-564   

- **AMS Standards**: AMS 4676 (Bar, Forgings)   

- **EN/DIN Standards**: 2.4375 (EN)   

- **Other**: UNS N05500, NACE MR0175 compliant   

 **3. Chemical Composition (wt%)**   

| Element        | Min.   | Max.   |   

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

| Nickel (Ni)    | 63.0   | 70.0   |   

| Copper (Cu)    | 27.0   | 33.0   |   

| Aluminum (Al)  | 2.3    | 3.15   |   

| Titanium (Ti)  | 0.35   | 0.85   |   

| Iron (Fe)      | -      | 2.0    |   

| Manganese (Mn) | -      | 1.5    |   

| Carbon (C)     | -      | 0.25   |   

| Silicon (Si)   | -      | 0.5    |   

| Sulfur (S)     | -      | 0.01   |   

 **4. Physical Properties**   

| Property                      | Value                           |   

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

| Density                       | 8.44 g/cm³ (0.305 lb/in³)      |   

| Melting Point                 | 1315-1350°C (2400-2460°F)      |   

| Thermal Conductivity          | 17.2 W/m·K (at 100°C)          |   

| Electrical Resistivity        | 0.70 μΩ·m (at 20°C)            |   

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

| Magnetic Permeability         | Slightly magnetic (when cold worked) |   

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

| Property                      | Value                           |   

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

| Tensile Strength              | 965-1200 MPa (140-174 ksi)      |   

| Yield Strength (0.2% Offset)  | 655-965 MPa (95-140 ksi)        |   

| Elongation (in 50 mm)         | 20-35%                          |   

| Hardness (Rockwell C)         | 25-35 HRC                       |   

 **6. Heat Treatment**  

 - **Solution Annealing**: 980-1010°C (1800-1850°F) followed by rapid cooling   

- **Aging Treatment**: 595-620°C (1100-1150°F) for 4-16 hours, then air cool   

 **7. Product Forms**   

- Bar, Rod, and Wire   

- Plate, Sheet, and Strip   

- Forgings and Fasteners   

- Pumps, Valves, and Shafts   

 **8. Applications**  

 - **Marine Engineering**: Propeller shafts, pump shafts, marine fixtures   

- **Oil & Gas**: Drill collars, wellhead components, valve stems   

- **Aerospace**: Turbine blades, fuel pump components   

- **Chemical Processing**: Pump impellers, scraper blades, fasteners   

- **Medical**: Surgical instruments, prosthetic devices   

 **9. Corrosion Resistance**   

- Excellent resistance to seawater and brine solutions   

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

- Superior stress corrosion cracking resistance compared to Monel 400   

- Not recommended for oxidizing acids or high-temperature oxidizing environments   

 **10. Fabrication Notes**   

- **Machining**: Similar to Monel 400 but harder; use positive rake angles   

- **Welding**: Use matching filler metal (ERNiCu-7); solution anneal after welding   

- **Hot Working**: Forge at 1050-1150°C (1920-2100°F)   

- **Cold Working**: Good ductility in annealed condition   

 **11. Special Characteristics**   

- Age-hardening provides high strength while maintaining corrosion resistance   

- Good mechanical properties at sub-zero and elevated temperatures (up to 480°C/900°F)   

- Non-magnetic in annealed condition, slightly magnetic when cold worked  

Packing of Alloy K500,Monel K500,UNS N05500

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 1630 gallon liquid totes Special package is available on request.