When making a cold-rolled pipe, its section can have a certain degree of bending, and the bending is beneficial to the bearing capacity of the cold-rolled pipe. However, when making a hot-rolled pipe, its section must not be partially bent, which will affect its service life.
Due to the difference in the production process of cold-rolled pipe and hot-rolled pipes, their dimensional accuracy and surface finish are also different. Generally speaking, cold-rolled pipe are more precise than hot-rolled pipe, and the surface finish is much better.
The production process of cold-rolled pipe and hot-rolled pipe is different. When the cold-rolled pipe is made and formed, it needs to go through the pipe slug process, heat treatment, perforation technology, hot rolling process, head treatment, pickling process, phosphating treatment, cold drawing process, annealing treatment, straightening treatment, pipe cutting process, As well as inspection of finished products, packaging and processing.
The hot-rolled pipe needs to be subjected to the tube process, heat treatment, piercing and forming, tube rolling treatment, sizing treatment, cooling bed treatment, straightening treatment, switching treatment, and final inspection and packaging. From these introductions, it can be seen that there are certain differences in their technological procedures.