What is the difference and connection between the cold drawn tube and the welded tube?

- May 13, 2019-

Cold drawn tubes and welded tubes are very different and related. They are a type of steel tube, but they are still difficult to distinguish. They look very similar, but their production methods are different, so they show up. Some of the performance is not the same, so the difference between the two is there, so we make a relatively simple comparison of the two, look at these differences and connections:


A cold drawn tube is a type of steel pipe, that is, one classified according to a different production process, which is different from a hot rolled (expanded) pipe. It is formed by multi-pass cold drawing in the process of expanding the diameter of the capillary tube or the raw material tube, and is usually carried out on a single-chain or double-chain cold drawing machine of 0.5 to 100T. Cold-rolled (dial) steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, mechanical processing pipe, thick-walled pipe, small diameter plus internal die cold drawn pipe other steel pipe It also includes carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes. Cold drawn steel pipe can have an outer diameter of 6mm and a wall thickness of 0.25mm. The outer diameter of the thin-walled pipe can be up to 5mm and the wall thickness is less than 0.25mm. The precision and surface quality are obviously better than the hot-rolled (expanded) pipe, but the process is affected. Restricted, its caliber and length are subject to certain restrictions.


Welded pipe, also called welded pipe, is a steel pipe made by welding or forming a steel plate or strip steel. It is usually 6 meters long. The welded steel pipe has simple production process, high production efficiency, many varieties and specifications, and low equipment investment, but the general strength is lower than that of seamless steel pipe.


These are the main reasons and differences between cold drawn tubes and welded tubes. You can make a reference to judge, pay attention to the difference in performance, and you can't use it confusedly. Otherwise, there will be many problems.