Engineering Materials
Cobalt in steel

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

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Engineering Materials
The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C below lower critical temperature
30° C to 50° C below upper critical temperature
30° C to 50° C above upper critical temperature
30° C to 50° C above lower critical temperature

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