Engineering Materials
The machinability of steel is increased by

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

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Engineering Materials
Aluminium bronze contains

92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
90% magnesium and 9% aluminium with some copper
10% aluminium and 90% copper

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