Difference 1:
When making cold-rolled pipes, its cross-section can have a certain degree of bending, and bending is beneficial to the bearing capacity of cold-rolled pipes. However, when making hot-rolled pipes, its cross-section must not have local bending, which will affect its service life.
Difference 2:
Due to the difference in the production process of cold-rolled pipes and hot-rolled pipes, their dimensional accuracy and surface finish are also different. Generally speaking, the precision of cold-rolled pipes is higher than that of hot-rolled pipes, and the surface finish is much better.
Difference 3:
The production process of cold-rolled pipe and hot-rolled pipe is different. When cold-rolled pipes are produced and formed, they need to go through the tube-stacking process, heating treatment, piercing technology, hot-rolling process, head treatment, pickling process, phosphating treatment, cold-drawing process, annealing treatment, straightening treatment, pipe cutting process, And inspection of finished products, packaging and processing. The hot-rolled pipes need to be processed by the tube blanking process, heating treatment, piercing and forming, rolling treatment, sizing treatment, cooling bed treatment, straightening treatment, switching treatment, and final inspection and packaging. It can be seen from these introductions that there are certain differences in their process procedures.
Difference 4:
The cross-sectional distribution of cold-rolled pipes and hot-rolled pipes is also different to a certain extent, because the reasons for the residual stress are different during forming. This leads to some bending of the residual stress of the cross-section of the cold-rolled tube, while the residual stress of the hot-rolled tube is of the film type.
Difference 5:
Because the production process of hot-rolled pipe and cold-rolled pipe is different, the hot-rolled pipe sold on the market is divided into hot-rolled seamless steel pipe and hot-rolled welded steel pipe; and cold-rolled pipe can be divided into cold-rolled seamless steel pipe and cold-rolled seamless steel pipe. Cold-rolled welded steel pipes and cold-rolled seamless steel pipes can be divided into two types: round pipes and special-shaped pipes.
