Designated as UNS N04401, Monel 401(also know as “Alloy 401”) is a copper-nickel alloy designed for specialized electrical and electronic applications. It has a very low temperature coefficient of resistance and medium-range electrical resistivity. Alloy 401 can be readily welded by the gas tungsten arc (GTAW) process or resistance weilding. Monel 401 is normally furnished in the product form of wire which is mainly used for wire-wound precision resistors and bi-metal contact.

1. Chemical Composition Requirements

The Chemical Composition of Monel 401, %
Nickel	40.0-45.0
Carbon	≤0.10
Manganese	≤2.25
Iron	≤0.75
Cobalt	≤0.25
Sulfur	≤0.015
Silicon	≤0.25
Copper	Balance

2. Physical Properties of Monel 401

Density	Thermal conductivity	Thermal coefficient of Resistance	Electrical Resistivity
g/cm3	W/m. °C	ppm/°C	µΩ·m
8.91	21.0	±20	0.498

3. Mechanical Properties of Monel 401

Tensile Strength, min.		Yield Strength, min.		Elongation
Mpa	ksi	Mpa	ksi	%
441	64	134	19.5	51

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