What is cold rolled seamless steel tube?

Cold rolled seamless steel tube (GB3639-2000) is a kind of cold drawn or cold-rolled precision seamless steel tube with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment.

Cold rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe and other steel pipes, as well as carbon thin-walled steel pipe, alloy thin-walled steel pipe, stainless thin-walled steel pipe and special-shaped steel pipe.

The outer diameter of the hot-rolled seamless pipe is generally larger than 32mm, and the wall thickness is 2.5-75mm. The diameter of the cold-rolled seamless pipe can be 6mm, the wall thickness can be 0.25mm, the outer diameter of the thin-walled pipe can be 5mm, and the wall thickness is less than 0.25mm. The size accuracy of the cold-rolled seamless pipe is higher than that of the hot-rolled seamless pipe.

Cold rolling refers to cold drawing, cold bending, cold drawing and other cold processing to process steel plates or strips into various types of steel at room temperature.

The advantages of cold-rolled seamless pipe are fast forming speed, high output, and no damage to the coating, which can be made into a variety of cross-section forms to meet the needs of the use conditions; cold rolling can make the steel produce great plastic deformation, thus improving the yield point of the steel.