Engineering Materials
Manganese is added in low carbon steel to

Make the steel tougher and harder
All of these
Make the steel ductile and of good bending qualities
Raise the yield point

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Engineering Materials
Chromium in steel

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

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