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In general, how much harder should a cutting tool be than the material?
The approximate hardness of the workpiece material that can be processed is as follows.
・ Difference in hardness for stable machining: tool hardness -40HRC
・ Hardness difference that can be managed to be processed: Tool hardness -20HRC
The hardness of the high-speed is 63~69HRC → The workpiece material has a workpiece hardness of 43~49HRC
powder metallurgy HSS (XPM) hardness is 68~72HRC → Workpiece limit hardness 48~52HRC
* For materials that exceed the machining limit hardness of the high-speed, it is necessary to select carbide tools.