题目内容

8%的高碳钢与低碳钢相比，可锻性较差。在选择终锻温度时，高碳钢的终锻温度却低于低碳钢的终锻温度;其主要原因是为了()。

A. 使高碳钢晶粒细化提高强度
B. 使高碳钢获得优良的表面质量
C. 打碎高碳钢内部的网状碳化物

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