High manganese steel can be processed with KBN700 brand cutter. High manganese steel is a typical difficult-to-machine material. In the process of turning, there are often problems such as severe hardening and high calorific value, which are easy to make the tool invalid. For the above processing problems of high manganese steel, KBN700 cubic boron nitride blade is a better choice, and the hardness of KBN700 material itself is relatively high. In view of the defects of high manganese steel castings, serious surface hardening, low machining ability and efficiency of traditional tools, there are some problems.