Cylinder tube is a kind of high-precision steel pipe material processed by cold drawing or hot rolling. Thanks to its advantages including no oxide layers on the inner and outer walls of the precision steel pipe, zero leakage under high pressure, high dimensional accuracy, high surface finish, no deformation during cold bending, and no cracks occurring in flaring and flattening processes, it is mainly applied to manufacture pneumatic or hydraulic components such as air cylinders and hydraulic cylinders, and it can be seamless pipe. The chemical components of cylinder tubes include Carbon (C), Silicon (Si), Manganese (Mn), Sulfur (S), Phosphorus (P) and Chromium (Cr).