What is the material of common square tube?​

Square tube usually has steel square tube, iron square tube, copper square tube, aluminum square tube, plastic square tube, wood square tube, paper square tube and so on, usually said square tube, generally refers to steel square tube, and is divided into carbon steel square tube, stainless steel square tube, low alloy steel square tube and mixed composite square tube... Specific carbon steel square pipe performance material brand is: Q195, Q215, Q235, Q345, 20#, 16Mn, Q420, st52-3, ATSM A500, ss400, Q295, S355.