Ni-Cu 405 (Monel®) (UNS N04405)
Description
Alloy 405 (Monel®) is a ductile nickel-copper alloy with resistance to a variety of corrosive conditions. The alloy is most frequently applied in a range of environments ranging from mildly oxidizing through neutral and to moderately reducing conditions. An additional application area of the material is in marine environments and other non-oxidizing chloride solutions.
Alloy 405 is the free-machining grade of alloy 400. Its greater sulfur content enhances machinability. It has essentially the same corrosion resistance and physical properties as alloy 400, but a slightly different range of mechanical properties. Alloy 405 is used chiefly for automatic- screw-machine stock and is not generally recommended for other applications. Due to the sulfur addition for free machining, welding is not possible for Alloy 405.
Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM B164*
| Carbon | 0.3 | Manganese | 2.0 |
| Nickel | 63.0 min | Silicon | 0.5 |
| Copper | 28.0-34.0 | Sulfur | 0.025-0.060 |
| Iron | 2.5 |
*Maximum, unless range is indicated
Physical Properties
Physical properties for Alloy 405
| Density, lb/in3 | 0.319 |
| Modulus of Elasticity, psi | 26 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 7.7 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 14 |
| Specific Heat, Btu/lb ˚F | 0.10 |
| Electrical Resistivity, Microhm-in | 20.0 |
Mechanical Properties
Mechanical property requirements as specified for annealed product in ASTM B164
| Yield Strength, min. (ksi) | 25 |
| Tensile Strength, min. (ksi) | 70 |
| Elongation, min. (%) | 35 |
Standards
Typical standards for Alloy 405
| ASTM B164 |
| ASME SB614 |