结果表明，P2 0钢回火后的硬度越高，粗糙度越低，抛光性能越好；
The results showed that the hardness of tempered P20 steel higher, the roughness lower and the polishing performance better;
结果表明，P2 0钢回火后的硬度越高，粗糙度越低，抛光性能越好；
The results showed that the hardness of tempered P20 steel higher, the roughness lower and the polishing performance better;
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