The difference between cold drawn steel pipe and hot rolled steel pipe
A customer needs hot rolled steel pipe this week, but only cold rolled steel pipe due to the special wall thickness.Today let’s learn about the difference between hot rolled steel pipe and cold drawn steel pipe.
Cold drawn steel pipe:
Cold drawn steel pipe is a steel pipe with no seam on the surface of the whole steel pipe produced by drawing, extrusion and perforation.It is a round, square or rectangular steel with a hollow cross section and no seams around the edges.It is made of steel ingot or solid tube billet by perforation into capillary, and then made by cold dialing.
Cold drawn steel pipe is used for mechanical structure, hydraulic equipment, high dimensional accuracy and good surface finish precision cold drawn seamless pipe.Selection of precision seamless tube manufacturing mechanical structure or hydraulic equipment, can greatly save mechanical processing hours, improve the utilization rate of materials, and is conducive to improving the quality of products.
Hot rolling is relative to cold rolling, which is rolled below the recrystallization temperature, while hot rolling is rolled above the recrystallization temperature.
Difference between hot rolled steel pipe and cold drawn steel pipe:
1: In the production of cold rolled pipe, its section can have a certain degree of bending, bending is conducive to the bearing capacity of cold rolled pipe.However, in the production of hot rolled pipe, its section is not allowed to have local bending phenomenon, which will affect its service life.
2: Due to the difference in the production process between the cold rolled pipe and the hot rolled pipe, their dimensional accuracy and surface finish are also different.In general, the cold rolled pipe is more accurate than the hot rolled pipe, and the surface finish is much better.
3: The production process of cold rolled pipe is different from that of hot rolled pipe.In the process of making and forming cold rolled pipe, the writer’s process, heating treatment, perforation technology, hot rolling technology, head treatment, pickling engineering, phosphating treatment, cold drawing process, annealing treatment, straightening treatment, pipe cutting process, inspection of finished products and packaging treatment are required.On the other hand, hot-rolled pipes need to be wrapped, heated, perforated, rolled, sizing, cold-bed, straightening, switching, as well as final inspection and packaging.From these introductions we can see that there are certain differences in their technological procedures.
4: The section distribution of cold rolled pipe and hot rolled pipe is also different, because the reasons for the residual stress are different in the process of forming.This results in some bending of the residual stress in the section of the cold rolled pipe, whereas the residual stress in the hot rolled pipe is of the thin film type.
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 the cold rolled pipe can be divided into cold rolled seamless steel pipe and cold rolled welded steel pipe, cold rolled seamless steel pipe can be divided into round pipe and special-shaped pipe these two kinds.
In fact, hot rolled pipe and cold rolled pipe after forming, the difference is not very big, at the same time their mechanical properties are similar.If you are willing to buy these pipes, you must choose a more formal, strong strength, good reputation manufacturers to buy, so as to ensure the quality of the pipes and the service life. Please contact my email: email@example.com