Product Description
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. As would be expected from its high copper content, monel 400 is rapidly attacked by nitric acid and ammonia systems.
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
Rp
0. 2N/mm²
Elongation
As %
Status
Monel 400
480
170
35
Solution treatment