Engineering Materials
Tensile strength of steel can be safely increased by

Adding carbon up to 0.83%
Adding small quantities of copper
Adding carbon up to 2.8%
Adding carbon up to 6.3%

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

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