What exactly are the characteristics of metal machining like stainless steel?

The machinability of stainless is much even worse than carbon metallic material parts. The machinability of austenitic stainless steels is the worst. Stainless steel machining has the pursuing characteristics:
(1) hardening significantly in processing: because the plasticity of stainless is quite heavy, and not stable enough, during the action of cutting stress, the hardening layer produced. And affect the schedule of the follow-up proces
What exactly are the characteristics of metal machining like stainless steel?