This equipment is divided into two types of RN and RQ; RN type of mould, cutting tool or mechanical parts (including cast iron a) seepage nitrogen, oxygen and nitrogen, carbon and nitrogen of permeability of permeability, low carbon austenitic nitrogen of permeability, and thin walled parts shallow strengthen and steam oxidation process and piston rings finalize the design, little without oxidation, rings permeability nitrogen, heat treatment process is the most advanced domestic one of heat treatment equipment.