Thick-walled steel pipes, which are steel pipes with a ratio of outer diameter to wall thickness of less than 20, are called thick-walled steel pipes. It is mainly used as petroleum geological drilling pipe, cracking pipe for petrochemical industry, boiler pipe, bearing pipe, and high-precision structural pipe for automobile, tractor and aviation.

    The biggest difference between thick-walled steel pipes and thin-walled steel pipes is the thickness of the steel pipe wall. Generally speaking, thin-walled steel pipes are cold drawing technology, thick-walled steel pipes and thick-walled steel pipes generally make with hot rolling technology, if it is distinguished by measurement unit, then it is generally considered that the wall thickness/tube diameter is equal to 0.02 is the watershed of thick-walled steel pipe and thin-walled steel pipe, and the wall thickness/pipe diameter is less than 0.02 is thin-walled steel pipe. More than a thick-walled steel pipe, in terms of use, thin-walled steel pipe is mostly used on pipes. Thick-walled steel pipes are mostly used for blanks of hollow parts. Used under pressure and on important pipelines.

Thick-walled steel pipes are mainly used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction. For liquid transportation: water supply and drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural use: for piling pipes, for bridges; for piers, roads, building structures, etc.