Engineering Materials
Cyaniding is the process of

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

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Engineering Materials
Grey cast iron

Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable
Is produced by annealing process. I is soft, tough and easily machined metal
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroidal form and is well dispersed throughout the material

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