Engineering Materials
A material is said to be allotropic, if it has

Any one of the above
Atoms distributed in random pattern
Different crystal structures at different temperatures
Fixed structure at all temperatures

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Engineering Materials
Chromium in steel

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

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