Designated as UNS N04405, Monel R-405 (also known as “Alloy R-405”), is a nickel-copper alloy and the free-machining version of Monel 400. The deliberately controlled greater amount of sulfur is added to provide sulfide inclusions that act as chip breakers during machining hence enhances the machinability of the alloy. Monel R-405 is used primarily for meter and valve parts, fasteners, as well as screw machine components.

1. Chemical Composition Requirements

The Chemical Composition of Monel R405, %
Nickel	≥63.0
Carbon	≤0.30
Manganese	≤2.0
Iron	≤2.5
Sulfur	0.025-0.060
Silicon	≤0.5
Copper	28.0-34.0

2. Physical Properties of Monel R-405

Density	Melting Range	Poisson's Ratio	Curie Temperature
g/cm3	°C	-	°F	°C
8.80	1300-1350	0.32	70-120	21-49

3. Mechanical Properties of Monel R-405

Tensile Strength, min.		Yield Strength, min.		Elongation, min	Hardness
Mpa	ksi	Mpa	ksi	%	HB
550	80	240	35	40	110-140

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