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从切削刀具的磨损、切削阻力、切削温度等方面对比了预硬型塑料模具钢Ｐ２０ＢＳＣａ与瑞典７１８钢的可切削性能，并对Ｐ２０ＢＳＣａ钢可切削机理进行了研究。结果表明，在相同的预硬硬度条件下，Ｐ２０ＢＳＣａ钢具有较小的切削阻力，较低的切削温度，Ｐ２０ＢＳＣａ钢硬度为３５ＨＲＣ时切削刀具的磨损量小于７１８钢硬度为３０ＨＲＣ时刀具的磨损量，其可切削性能提高的原因是钢中低强度ＭｎＳ夹杂物改变了钢的韧性及塑性，降低了材料与刀具刃部的摩擦系数等因素。
The machinability of P20BSCa pre-hardened plastic mold steel and Swedish 718 steel were compared with the cutting tool wear, cutting resistance and cutting temperature. The cutting mechanism of P20BSCa steel was also studied. The results show that the P20BSCa steel has lower cutting resistance and lower cutting temperature under the same pre-hardened condition. The wear amount of the cutting tool is less than the wear amount of the cutting tool when P20BSCa steel hardness is 35HRC, The reason for its machinability improvement is that the low-strength MnS inclusions in the steel change the toughness and plasticity of the steel and reduce the friction coefficient between the material and the tool edge.