Engineering Materials
The machinability of steel is increased by

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

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Engineering Materials
Tungsten in steel

Gives ductility, toughness, tensile strength and anti-corrosion properties
Improves wear resistance, cutting ability and toughness
Improves cutting ability and reduces hardenability
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

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