Introduction 1. Cylinder Barrel Hydraulic equipment includes engineering hydraulic cylinder, hydraulic cylinder for metallurgical equipment, hydraulic cylinder for industry and thin hydraulic cylinder, etc. The commonly used materials of DGR-MOB Series Hydraulic Cylinder are seamless steel pipes of 20#, 35#, and 45#, which have been honed or rolled to meet the European roughness requirements of less than 0.4um. Low pressure oil cylinders can use 20# steel pipes, while high pressure oil cylinders can use 45# steel pipes. 2. Piston Rod There are two types of piston rods: solid rod and hollow rod. One end of the hollow piston rod should have a vent hole for welding and heat treatment. The material of the plug rod is 35# and 45# steel, and the material of the hollow piston rod is 35# and 45# seamless steel pipe. After rough machining, the piston rod is quenched and tempered to a hardness of 229-285HB. If necessary, it is then subjected to high…