Cold drawn steel pipe, cold drawn steel tube and its difference of cold drawn steel tube hot rolled steel tube to be under the normal temperature of the environment, after a series of cold drawn, cold bending aluminium coated tubes and so on technology, processing and become a kind of steel. And relative to the cold drawn steel tube of hot-rolled tube, it is above the recrystallization temperature, carry on the processing of a kind of steel.
At the time of production of cold drawn steel tube, its cross section is can have a certain degree of bending, bending for cold drawn steel tube to bear ability. However, in the production of hot-rolled tube, its cross section is not can have the phenomenon of local bending, it will affect the service life of it. Because of the cold drawn steel tube with hot rolled pipe production process is different, so lead to the size of the precision accuracy of surface finish is different also. In general, cold drawn steel tube is higher than the accuracy of hot-rolled tube, also better surface finish.
Cold drawn steel tube with hot rolled pipe production process is different. When stainless steel tube 304 cold drawn steel tube production molding, need through tube process, heat treatment, perforation technology, hot rolling process, the heading treatment, pickling, phosphating, cold drawing process, the annealing treatment, the straightening process, pipe cutting process, and testing finished products, packaging processing. While hot rolled tube to tube process, heat treatment, punch forming, tube rolling processing, sizing processing, cooling bed, straightening processing, switching process, and final inspection package. Can be seen from the introduction of their process has a certain difference.
, the section distribution of cold drawn steel tube and hot rolled tube have some different, this is because the production molding, the causes of residual stress is different. This leads to the cold drawn steel tube cross section of the residual stress has some bend, and the residual stress of hot rolled tube belongs to the thin film. Because hot rolled and cold drawn steel tube production process is Cold Drawn Seamless Tubes different, so the hot-rolled tube that sells on the market is divided into hot rolled seamless steel pipe and hot rolling welded steel pipe; And cold drawn steel tube can be divided into cold drawn seamless steel tube and cold drawn welded steel pipe, cold drawn seamless steel tube and can be divided into circular tube and special-shaped tube of the two.