Seamless steel pipe manufacturers share: cold drawn precision seamless steel pipe matters needing attention

Cold-drawn precision seamless Steel Pipe Note Cold-drawn precision seamless steel pipe has no oxide layer inside and outside walls, withstand high pressure without leakage, high precision, high finish, cold bending is not deformed, flaring flat no cracks, The surface has been used for anti-rust treatment and other features, mainly used for mechanical structure, hydraulic equipment and automotive pneumatic or hydraulic components, such as cylinders or cylinders.
The basic process of cold drawing is: hot-rolled capillary -> capillary inspection, grinding -> capillary pickling -> capillary pickling -> cold drawing -> fine straightening - before pickling, lubrication —>Drawing —> Finished product —> Storage.
Production requires attention to control:
1. The thickness of the capillary tube of the capillary tube should be uniform, and there should be less internal and external surface defects; external surface polishing and internal hole defect cleaning equipment should be configured.
2. Compared with ordinary cold-drawn steel tubes, the re-examination has increased the hot-rolled capillary pickling re-inspection process compared to ordinary cold-drawn steel tubes. The main task is to ensure that the outer surface of the capillary tube is free from defects such as folding or cracks, and the inner surface is excluded from folding. , serious scribing, pitting and other defects of the capillary.
3, tools General cold-drawn precision seamless steel pipe production tools used in the surface finish requirements Ra0.4 above, the dimensional accuracy of H3 or more, hardness requirements above HRC70. At the same time, it is required that the head or mold sticking steel phenomenon cannot occur during drawing.
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 oxide scale. Cold-drawn precision steel pipes need to be equipped with non-oxidation bright annealing furnace equipment.
5, pickling precision seamless steel pipe in the sulfuric acid pickling process is easy to form with Fe2O3, Fe3O4 mainly "black slag", the formation of surface black spots in the follow-up production. Fe2O3 and Fe3O4 are easily dissolved in hydrochloric acid. In order to prevent the formation of dark spots, 5-10 g/l of NaCl is added to the acid pool.
6, lubrication should be used as a lubricant resin, this lubrication and phosphating lubrication (saponification) compared to a clear difference, the drawn out of the steel pipe showing the true nature of the iron matrix, both high finish and cold rolled tube-like The beautiful appearance of color.
The industrial control of production of cold-drawn precision seamless steel tubes includes mold design, annealing, pickling, lubrication, and other conditions control. At the same time, good work should be done on capillary tube quality inspection and refurbishment.
The above information was specially issued by the Shandong seamless steel pipe manufacturer.