Unless high speed steel of high cobalt content might be realized in special conditions, hardness of low alloy tool steels did not reach up to HRC68～72 in general case. Meanwhile, hardness of tool steels after quenching and tempering was almost coincide. It is very difficulty to obtain cementite and carbide precipitates with fine size by aggregation growth of cementite and carbide of iron in tempering. Therefore, obviours strengthen action of cementite or carbide precipitates can not be obtained for years.
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