What material is the piston rod of the hydraulic cylinder?

The piston rod of hydraulic cylinder is made of 45# steel, quenched and tempered, and the surface is turned and ground, and the chromium plating is 0.03~0.05mm thick. The piston rod is a connecting part that supports the piston to do work. It is mostly used for the motion executive parts of oil cylinders and cylinders. It is a moving part with frequent movements and high technical requirements. Taking a hydraulic cylinder as an example, it consists of a cylinder, a piston rod (cylinder rod), a piston and an end cover. The machining quality of piston rod directly affects the life and reliability of the whole product. The machining requirements of piston rod are high, and its surface roughness is required to be Ra 0.4 ~ 0.8 um, and the requirements for coaxiality and wear resistance are strict. The working mode of piston rod is reciprocating motion. In order to prolong the service life of the piston rod and reduce the wear halo of the piston rod, 38CrMoAlAn alloy structural steel is selected as the blank. According to the machining accuracy requirements of each part of the part drawing, the dimension tolerance grade of forgings is 8- 12. Small batch production of piston rod, considering cylindrical blank.