JB 4218-1994 The standard for metallization of borax molten salt deals with the process requirements for chromium, vanadium or niobium infiltration of steel parts in the molten salt of borax. The standard specifies the matrix material, equipment, infiltration agent ratio and quality control of the metal infiltration, which are suitable for improving the surface Hardness and corrosion resistance of steel or cast iron workpieces. The standard details the equipment requirements for metallization, including high temperature resistant crucible, electric heater and temperature control device, as well as operation details and post-treatment steps in the metallization process. In addition, a mass inspection method for the metallized layer is provided to ensure that the infiltration layer meets the technical requirements.