MONEL® nickel-copper alloy R-405 (UNS N04405) is the free-machining grade of alloy 400. Its greater sulfur content enhances machinability. It has essentially the same corrosion resistance and physical properties as alloy 400, but a slightly different range of mechanical properties. Alloy R-405 is used chiefly for automaticscrew-machine stock and is not generally recommended for other applications. The composition is shown in Table 1. Thermal expansion of alloy R-405 is shown in Table 2. The values for physical constants and other thermal properties of MONEL alloy 400 may be used for MONEL alloy R-405 and are shown in Tables 3 and 4. Table 1 - Limiting Chemical Composition, %, of MONEL Alloy R-405 Nickel (plus Cobalt) .....................................................63.0 min. Carbon..........................................................................0.3 max. Manganese ...................................................................2.0 max. Iron................................................................................2.5 max. Sulfur.......................................................................0.025-0.060 Silicon ...........................................................................0.5 max. Copper ......................................................................28.0 - 34.0 Table 3 - Physical Constants of MONEL Alloy 400 a Density, g/cm3 .....................................................................8.80 lb/in.3 ...................................................................0.318 Melting Range, °F .....................................................2370-2460 °C .....................................................1300-1350 Modulus of Elasticity, 103 ksi  Tension .............................................................................26.0 Compression ....................................................................26.0 Torsion................................................................................9.5 Poisson’s Ratio....................................................................0.32 Curie Temperature, °F .....................................................70-120 °C ......................................................21-49 a These values also apply to MONEL alloy R-405, the free-machining version of MONEL alloy 400