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in Chemistry by (79.8k points)

Tempering steel is a process of heating 

(a) steel in contact with carbon and quenching it 

(b) steel in the presence of ammonia and quenching it 

(c) the hardened steel to a temperature below redness and cooling it slowly 

(d) steel to bright redness and quenching it.

1 Answer

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Best answer

The correct option is (c) the hardened steel to a temperature below redness and cooling it slowly.

Explanation:

Tempering of steel is a process of heating the steel to a temperature below redness and then cooling it slowly. A thin film of the oxide is formed on the surface of steel.

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