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Define the term tempering and nitriding....

Define the term tempering and nitriding.

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Tempering : In this process the hardened and steek is heated to a temperature much below redness and then it is slowly cooled. The product obtained in neither so hard nor so brittle. `
` Nitriding : In this process steel is heated in the atmosphere of ammonia. The surface of steel is coated with a hard iron nitride.
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