2024-11-22
Manufacturing Method of Seamless Pipe-ERW Steel Pipe
The production method of seamless pipe is roughly divided into the cross-rolling method (Mennesmann method) and the extrusion method. The former method is to first perforate the tube with a skew roll, and then extend it with a rolling mill. This method has a fast production speed, but requires higher machinability of the tube blank, and is mainly suitable for the production of carbon steel and low-alloy steel tubes. The latter method is to pierce the tube blank or ingot with a piercing machine, and then extrude it into a steel pipe with an extruder. This method is less efficient than the skew rolling method and is suitable for the production of high-strength alloy steel pipes. Both the skew rolling method and the extrusion method must first heat the tube blank or ingot, and the produced steel tube is called a hot-rolled tube. Steel pipes produced by hot working methods can sometimes be cold worked as needed.