Engineering Materials
White metal contains

88% copper and 10% tin and rest zinc
Alloy of tin, lead and cadmium
63 to 67% nickel and 30% copper
Silver and chromium

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Engineering Materials
In spheroidising process, the steel is

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
Heated below the lower critical temperature and then cooled slowly
None of these
Heated up to the lower critical temperature and then cooled in still air

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Engineering Materials
Cobalt in steel

Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties
Gives ductility, toughness, tensile strength and anti corrosion property
Improves cutting ability and reduce hardenability
Improves wear resistance, cutting ability and toughness

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