Engineering Materials
The machinability of steel is increased by

Phosphorous and aluminium
Silicon and sulphur
Phosphorous, lead and sulphur
Sulphur, graphite and aluminium

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Engineering Materials
Dow metal contains

90% aluminium and 90% copper
92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
90% magnesium and 9% aluminium with some copper
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

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