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Normalizing. Quenching. (T emper ing) Af ter heating t o ov er 727°C, cool rapidly. down to 550°C in w ater or oil. Quenching makes st eel hard. because it cools down red-hot st eel very rapidly in water or oil, but it ma y promote internal stress. In order t o remo ve such int ernal stress, tempering is used. 15crmn 25crmn 40crmn forged alloy steel shaft used in wind 15crmn 25crmn 40crmn forged alloy steel shaft used in wind energy manufacturers and 15crmn 25crmn 40crmn forged alloy steel shaft used in wind energy suppliers Directory on china-castingforging.

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