Engineering Materials
Machining properties of steel are improved by adding

Silicon, aluminium, titanium
Chromium, nickel
Vanadium, aluminium
Sulphur, lead, phosphorous

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Engineering Materials
Cobalt in steel

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

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Engineering Materials
Carbon steel is

Refined from cast iron
Made by adding carbon in steel
An alloy of iron and carbon with varying quantities of phosphorus and sulphur
Extensively used for making cutting tools

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