Engineering Materials
Cementite consist of

13% cementite and 87% ferrite
13% carbon and 87% ferrite
13% ferrite and 87% cementite
6.67% carbon and 93.33% iron

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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
Improves cutting ability and reduce hardenability
Gives ductility, toughness, tensile strength and anti corrosion property
Improves wear resistance, cutting ability and toughness

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Engineering Materials
Steel contains

50% or more iron
Alloying elements like chromium, tungsten nickel and copper
Elements like phosphorus, sulphur and silicon in varying quantities
80% or more iron

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