Alloy 400 (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.
The alloy has a long history of use as a corrosion resistant material, dating back to the early twentieth century when it was developed as an attempt to use a high copper content nickel ore. The nickel and copper contents of the ore were in the approximate ratio which is now formally specified for the alloy.
As with commercially pure nickel, Alloy 400 is low in strength in the annealed condition. For this reason, a variety of tempers are used which have the effect of increasing the strength level of the material.
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Alloy 400 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 | 0.03 |
| Iron | 2.5 |
*Maximum, unless range is indicated
Alloy 400 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 400 Mechanical Properties
| Yield Strength, min. (ksi) | 25 |
| Tensile Strength, min. (ksi) | 70 |
| Elongation, min. (%) | 35 |
Alloy 400 Standards
| ASTM B164 |
| ASME SB614 |
Your Source for Alloy 400
At Double Eagle Alloys, we supply Alloy 400 in long bar and header plugs engineered for these demanding services. Contact our team to learn how Alloy 400 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.