Engineering Materials
Tensile strength of steel can be safely increased by

Adding carbon up to 0.83%
Adding carbon up to 6.3%
Adding carbon up to 2.8%
Adding small quantities of copper

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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
Dipping steel in cyanide bath
Obtaining cyanide salts
Reacting steel surface with cyanide salts

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Engineering Materials
Free carbon in iron makes the metal

Hard and gives a fine grained crystalline structure
Soft and gives a coarse grained crystalline structure
Hard and gives a coarse grained crystalline structure
Soft and gives a fine grained crystalline structure

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