Engineering Materials
Perminvar alloy having constant permeability is an alloy of

Copper, nickel and antimony
Nickel, copper and zinc
Nickel, copper and iron
Iron, zinc and bismuth

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Engineering Materials
Chromium in steel

Improves wear resistance, cutting ability and toughness
Gives ductility, toughness, tensile strength and anti-corrosion properties
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Improves cutting ability and reduces hardenability

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