Which of the following steel making process will make the steel hard but not brittle.

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Tempering is the process of heating quenched steel to a moderate temperature and then cooling it slowly.
It reduces brittleness while retaining most of the hardness and improves toughness.
Annealing softens steel, whereas quenching makes it very hard but brittle.
Hence, the process that makes steel hard but not brittle is tempering.

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