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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 55 crmna Spring Steel Bar 60Si2MnA 55CrMnA 60CrMnA 50CrVA 60CrMnBA 55 crmna . 55 crmna .

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