The biggest difference is that thick-walled steel English (Thick wall steel pipe) and thin-walled steel pipe wall thickness, general, thin-walled steel pipe, cold drawn technology, thick-walled steel pipe and thick wall steel pipe is generally used hot rolling, if unit of measurement is used to distinguish, then, is generally believed, wall thickness / diameter equal to 0.02 is a watershed in the thick-walled steel and thin-walled steel pipe, thin-walled steel pipe wall thickness / diameter less than 0.02, greater than the thick-walled steel purposes, used for thin-walled steel pipe. The thick-walled steel pipe used in the blank of the hollow parts. Pressure as well as an important channel for use.