Engineering Materials
The hardness and tensile strength in austenitic stainless steel can be increased by

Full annealing
Normalizing
Hardening and cold working
Martempering

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

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