Cold drawn precision seamless steel pipe has the characteristics of no oxide layer on the inner and outer walls, no high pressure, no leakage, high precision, high finish, no deformation during cold bending, no cracks in flaring, flattening, antirust treatment on the surface, etc., mainly used in mechanical structures , Hydraulic equipment and pneumatic or hydraulic components of automobiles and motorcycles, such as cylinders or oil cylinders.
The basic process of cold drawing is: hot rolled capillary tube-> capillary inspection, grinding-> capillary pickling-> capillary tube pickling re-examination-> cold drawing-> fine straightening before straightening-> pickling, lubrication —> Fine drawing—> Finished product pre-processing—> Storage.
Production needs to pay attention to control:
1. Capillary
The capillary wall thickness should be uniform, and the internal and external surface defects should be few; the external surface polishing and internal hole defect cleaning equipment should be equipped.
2. Recheck
Compared with ordinary cold-drawn steel tubes, the production of cold-drawn precision seamless tubes increases the hot-rolled capillary pickling re-inspection process, mainly to ensure that the outer surface of the capillary tube has no folds, cracks and other defects, and the inner surface is free of folds and severe scratch , Defective capillaries.
3. Tools
The surface finish of the tools used in the production of cold drawn precision seamless steel pipes is generally above Ra0.4, the dimensional accuracy is above H3, and the hardness is above HRC70. At the same time, it is required that the phenomenon of sticking to the head or the mold during the drawing process must not occur.
4. Annealing
Annealing is a very important process in the production of all cold-drawn pipes. The quality of the annealing affects both the performance of the steel pipe and the removal of scale. Cold drawn precision steel tubes need to be equipped with oxidation-free bright annealing furnace equipment.
5. Pickling
Precise seamless steel tubes are prone to form "black slag" mainly composed of Fe2O3 and Fe3O4 during the sulfuric acid pickling process, and form black spots on the surface in subsequent production. Fe2O3 and Fe3O4 are easily soluble in hydrochloric acid. To prevent the formation of black spots, add 5-10g / l NaCl to the acid tank.
6. Lubrication
Resin should be used as lubricant. This kind of lubricating has obvious difference compared with phosphating and lubricating (saponification). The drawn steel pipe shows the original color of iron matrix, which has both high finish and beautiful appearance like cold rolled pipe Color.
The industrial control of the production of cold drawn precision seamless steel tubes includes mold design, annealing, pickling, lubrication and other conditions control, and at the same time should do a good job in the quality inspection and repair of capillary tube.
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