Engineering Materials
Chromium in steel

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

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Engineering Materials
Points of arrest for iron correspond to

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

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