Engineering Materials
The hardness is the property of a material due to which it

Can be drawn into wires
Can cut another metal
Breaks with little permanent distortion
Can be rolled or hammered into thin sheets

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Engineering Materials
Cyaniding is the process of

Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
Obtaining cyanide salts
Dipping steel in cyanide bath
Reacting steel surface with cyanide salts

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