Before sand blasting in Dalian, first be familiar with the heat treatment process specification and the equipment to be used. During operation, necessary protective articles must be worn, such as work clothes, gloves, protective glasses, etc. Do not place anything that hinders operation between heating equipment and cooling equipment. Mixing carburizing agent, sand blasting, etc. shall be carried out in a separate room, and sufficient ventilation equipment shall be set. Equipment dangerous areas (such as power leads, bus bars, conductive rods and transmission mechanisms of electric furnaces) shall be protected with barbed wire, fences and plates. All tools used for heat treatment processing shall be placed in an orderly manner, and cracked and inappropriate tools are not allowed to be used. The entrances and exits of the workshop and the access roads in the workshop shall be unobstructed. Fire extinguishing sand boxes shall be placed near the nozzle of heavy oil furnace and the pouring nozzle of gas furnace; Fire extinguishers shall be placed in the workshop. Do not touch the workpiece after heat treatment, so as not to cause burns.