Engineering Materials
Manganese is added in low carbon steel to

All of these
Make the steel tougher and harder
Raise the yield point
Make the steel ductile and of good bending qualities

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Engineering Materials
Points of arrest for iron correspond to

Stages at which further heating does not increase temperature for some time
There is nothing like points of arrest
Stages at which allotropic forms change
Stages at which properties do not change with increase in temperature

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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 wear resistance, cutting ability and toughness
Improves cutting ability and reduce hardenability

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