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.
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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
Alloy 405 Physical Properties
| 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 |
Alloy 405 Mechanical Properties
| Yield Strength, min. (ksi) | 25 |
| Tensile Strength, min. (ksi) | 70 |
| Elongation, min. (%) | 35 |
Alloy 405 Standards
| ASTM B164 |
| ASME SB614 |
Your Source for Alloy 405
At Double Eagle Alloys, we supply Alloy 405 in long bar and header plugs engineered for these demanding services. Contact our team to learn how Alloy 405 can support long-term performance and reliability.
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Data shown are typical and provided for informational purposes only. Values should not be considered minimums or maximums for specification or final design. Actual product data may vary, and information may be revised without notice.