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2 9 9 . Heating the Hypo - eutectoid steels to 3 0 C above the upper critical temperature line, soaking at that temperature and

299. Heating the Hypo-eutectoid steels to 30C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called
Tempering
Hardening
Annealing
Normalising

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