Both the oblique rolling method and the extrusion method must first heat the tube blank or ingot, and the steel pipe produced is called a hot-rolled tube.

Steel pipes produced by hot processing can sometimes be cold processed as needed. There are two methods of cold processing: one is the cold drawing method, which is to pull the steel pipe through the tube drawing die to gradually thin and elongate the steel pipe; the other method is the cold rolling method, which is a method of applying a hot rolling mill to cold processing.

Cold processing of seamless steel pipes can improve the dimensional accuracy and processing finish of steel pipes, improve the mechanical properties of materials, etc.