The main purpose of tempering hardened steel is to increase its
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The main purpose of tempering steel is to increase its toughness
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Tempering can further decrease the hardness, increasing the ductility to a point more like annealed steel. Tempering is often used on carbon steels, producing much the same results. ... These steels are usually tempered after normalizing, to increase the toughness and relieve internal stresses.
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