Monel 450, also known as “Alloy 450”, is a copper-nickel alloy of the 70-30 type which has superior weldability. It is resistant to corrosion and bio-fouling in seawater. The Alloy 450 has good fatigue strength, and has relatively high thermal conductivity. It widely used for seawater condensers, condenser plates, distiller tubes, evaporator tubes, heat exchanger tubes and saltwater piping. Usually, the welding processes for Monel 450 alloys include gas tungsten arc welding(GTAW), gas metal arc welding(GMAW), and submerged-arc welding(SAW) with the Monel filler metal 67.

1. Chemical Composition Requirements

The Chemical Composition of Alloy 450/ Monel 450, %
Ni	29.0-33.0
Cu	Balance
Fe	0.4-1.0
Mn	≤1.0
S	≤0.020
Zn	≤1.0
Pb	≤0.05
P	≤0.020

2. Typical Physical Properties of Monel 450

Density	Melting Range		Thermal Conductivity	Electrical Resistivity
g/cm3	°C	°F	W/m.k	µΩ·m
8.91	1170-1240	2140-2260	29.4	412

3. Mechanical Properties of Monel 450

Tensile Strength, min.		Yield Strength, min.		Elongation, min.
Mpa	ksi	Mpa	ksi	%
385	56	165	24	46

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