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Question
Cobalt in steel
Options:
A .   Improves wear resistance, cutting ability and toughness
B .   Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties
C .   Improves cutting ability and reduce hardenability
D .   Gives ductility, toughness, tensile strength and anti corrosion property
Answer: Option C
Explanation :

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