High manganese steel refers to high alloy steel with a manganese content of more than 10%. High manganese steel is characterized by: the greater the external compressive stress or impact load, it is conducive to the formation of a hardened layer on the surface, so the higher the wear resistance of castings; With the gradual wear of the case hardening layer, new work hardening layer will continue to form under the action of external compressive stress or impact load. Therefore, it is suitable for making wear-resistant spare parts that can withstand the wear of high-impact load materials for a long time. It is widely used in grinding equipment such as metallurgy, mining, building materials, railway, electric power, coal, and so on.