1. Large cutting force and high cutting temperature
This type of material is strong, cutting tangential stress, plastic deformation, and thus cutting force. In addition, the material thermal conductivity is extremely poor, resulting in high cutting temperature, and high temperature is often concentrated in the narrow area near the cutting edge of the tool, thus accelerating the wear of the tool.

2. Serious work hardening
Austenitic stainless steel and some high-temperature alloys of stainless steel are austenitic organization, cutting tendency to work hardening, usually several times that of ordinary carbon steel, cutting tools in the work hardening region, so that the tool life is shortened.

3. Easy to stick the knife
On the austenitic stainless steel or martensitic stainless steel are the existence of processing chips tough, cutting temperature is very high. When the tough chips flow through the front face, will produce adhesion, welding and other sticky knife phenomena, affecting the surface roughness of processed parts.

4. Accelerated tool wear
The above materials generally contain high melting point elements, high plasticity, high cutting temperature, so that the tool wear accelerated, sharpening, tool change frequently, thus affecting the productivity and increase the cost of tool use.