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本文是在调查国内外有关易切削钢的物理和力学性能基础上分析这类钢中与切削加工性密切相关的几个主要组织，确定易切削相Ｍｎｓ的作用和建立各主要组织的成分和粒度分布对刀具耐用度的关系式。为预测加工某批易切削钢的最佳切削速度提供参考。
This article is based on the investigation of the physical and mechanical properties of free-cutting steel at home and abroad on the basis of analysis of these types of steel is closely related to the machinability of several major organizations to determine the role of free-cutting phase Mns and the establishment of the main components of the organization and size Distribution of tool durability relationship. To predict the machining of a group of free cutting steel cutting speed to provide the best reference.