Cold drawn pipe is a kind of steel pipe, in the production process of classified according to the different production process, to a certain extent different from hot-rolled pipe, cold drawn pipe in capillary billet or raw material in the process of hole enlargement is effective through many times of cold drawing process.
Cold drawn pipe to a certain extent, can be divided into alloy steel pipe, effective thick wall pipe and high pressure boiler pipe, oil cracking pipe of low and medium pressure boiler pipe, etc., to a certain extent of cold drawn pipe diameter to 6 mm, wall thickness to 0.25 mm, to 5 mm thin wall pipe diameter wall thickness is less than 0.25 mm size.
The Selection of cold drawing pipe
In the process of selecting materials, the cold drawing pipe can select the materials with low hardness and plasticity effectively under the condition of effective strength.
The specification of the cold drawing pipe shall be selected according to the specification of the finished product. In the process of operation, the extension rate can be effectively guaranteed to be 20% to 40%.
The material surface selected by the cold drawing pipe can not have cracks, folds, pits, cracks and so on.
Cold drawn pipe had better choose placed in 0.5 ~ 2 a after hot rolling steel pipe, to a certain extent, time is too short, so steel pipe surface rust shallow, time is too long, steel pipe surface rust too deep, these can lead to inadequate steel pipe surface pretreatment, thus affecting the surface quality of the product.