Monel 400 is a nickel-copper alloy (about 67% Ni - 23% Cu) that is resistant to sea water and steam at high temperatures as well as to salt and caustic solutions. Monel 400 is a solid solution alloy that can only be hardened by cold working. This nickel alloy exhibits characteristics like good corrosion resistance, good weldability and high strength. A low corrosion rate in rapidly flowing brackish or seawater combined with excellent resistance to stress-corrosion cracking in most freshwaters, and its resistance to a variety of corrosive conditions led to its wide use in marine applications and other non-oxidizing chloride solutions. This nickel alloy is particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated.
Monel 400 has great mechanical properties at subzero temperatures, can be used in temperatures up to 1000° F, and its melting point is 2370-2460° F. However, monel 400 is low in strength in the annealed condition so, a variety of tempers may be used to increase the strength.
Monel 400 Specification
Item Brand | Chemical Composition (%) | |||||||||
Monel 400 | C | Mn | Si | S | Ni | Fe | Cu | |||
≤0.3 | ≤2.0 | ≤0.5 | ≤0.024 | ≥63.0 | ≤2.5 | 28.0~34.0 | ||||
Standard | ||||||||||
Sheet/Plate | Round bar/Wire | Pipe | Tube | |||||||
ASME SB-127 AMS 4544 QQ-N-281 | ASME SB-164 ASME SB-564 AMS 4675 AMS 4730 AMS 4731 | ASME SB-163 ASME SB-165 ASME SB-829 | ASME SB-730 ASME SB-751 ASME SB-775 | |||||||
Monel 400 Minimum mechanical properties in the room temperature
Alloy state | Tensile strength Rm N/mm² | Yield strength 0. 2N/mm² | Elongation | Status |
Monel 400 | 480 | 170 | 35 | Solution treatment |