The austenitic 18-8 stainless steel is one of the most troublesome materials to be machined because of the tendencies of work-hardening, high temperature, and adhesion. The ultimate object of the experiment is to establish the machining standard of the austenitic stainless steel with carbide tools based upon tool life. Generally speaking, tool life in a modern machining practice should be specified not only by the flank wear, but by the crater. This paper describes the process of obtaining the optimum cutting conditions for turning the stainless steel from the viewpoint of tool life, and discusses how the tool life is governed by flank wear and crater depending upon the cutting conditions.

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