The precautions for cold drawn precision seamless steel pipe must be paid attention to by the insiders: cold drawn precision seamless steel pipe has no oxidation layer on the inner and outer walls, high pressure and no leakage, high precision, high smoothness, cold bending and no deformation, and flare pressure. Flat without cracks, surface has been rust-proof treatment, etc., mainly used for mechanical structures, hydraulic equipment and pneumatic or hydraulic components of automobiles and motorcycles, such as cylinders or cylinders. The basic process of cold drawing is: hot rolled capillary tube -> capillary tube inspection, grinding -> capillary tube pickling -> capillary tube pickling after re-examination -> cold drawing -> fine pulling road before straightening -> pickling, lubrication —> fine pull —> pre-processing of finished products —> storage. Production needs attention to control: 1, Capillary tube The wall thickness of the capillary tube should be uniform, and the surface defects on the inner and outer surfaces should be small; the outer surface polishing and inner hole defect cleaning equipment should be arranged. 2, Reexamination Compared with ordinary cold drawn steel pipe, cold drawn precision seamless pipe production increases the hot-rolled capillary pickling re-examination process, mainly to ensure that there are no defects such as folding and crack on the outer surface of the capillary tube, and the inner surface is excluded from folding and severely scribed. Tubes with defects such as pockmarks. 3, Tools Generally, the surface smoothness of tools used in the production of cold-drawn precision seamless steel tubes is above Ra0.4, the dimensional accuracy is above H3, and the hardness is required to be above HRC70. At the same time, it is required that the tip or mold sticking phenomenon cannot occur during the drawing process. 4, Annealing Annealing is a very important process in the production of all cold drawn tubes. The quality of the annealing affects both the performance of the steel tube and the removal of the scale. Cold drawn precision steel tubes require a non-oxidizing bright annealing furnace equipment. 5, Pickling The precision seamless steel pipe is easy to form "black slag" mainly composed of Fe2O3 and Fe3O4 in the acid pickling process, and forms a black spot on the surface in subsequent production. Fe2O3 and Fe3O4 are easily soluble in hydrochloric acid, and 5-10 g/l of NaCl is added to the acid bath to prevent the formation of dark spots. 6, Lubrication Resin should be used as a lubricant. This kind of lubrication has obvious difference compared with phosphating and lubrication (saponification). The drawn steel tube exhibits the true color of the iron matrix, and has a high finish and a beautiful appearance like a cold rolled tube.