Stainless steel cylinder tube is a kind of precision processed seamless steel pipe raw material after cold drawing or hot rolling. Because the inner and outer walls of precision seamless steel pipes have no air oxide layer, bear high pressure, no leakage, high precision, high smoothness, cold drawing without deformation, flaring, flattening without gaps, etc., it is key to the production of pneumatic or Products of the hydraulic system, such as air cylinders or hydraulic cylinders, can be seamless steel pipes. Among them, the composition of the cylinder tube includes carbon C , silicon Si , manganese Mn , sulfur S , phosphorus P , and chromium Cr . According to the swelling in the cylinder of a diesel engine, the cylinder is converted into mechanical kinetic energy. The piston rod in the cylinder of the refrigeration compressor reduces the steam to increase the working pressure. The casing of a turbine engine or a rotating piston engine is generally called a cylinder. The application of stainless steel cylindrical tube : packaging and printing ( tension sensor ) , semiconductor materials ( nut spot welding machine, cutting and grinding ) , automatic control system, intelligent robot, etc. Rockwell hardness test cylinder tube , in fact, and Brinell hardness testing is the same , the indentation experimentally , but not the same , Rockwell mainly accurate measurement of the deep indentation , universal application experimentally Rockwell hardness , Because the Rockwell hardness is suitable for testing soft metal composite materials , it is a very simple method to reasonably fill the insufficient Brinell hardness testing , and its relative method. But because the indentation is small, the strength value is not as accurate as the Brinell hardness value.