Bazhou Wanxin Industrial and Trading Co., Ltd.
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Key points for production of precision seamless steel pipes

Cold drawn precision seamless steel pipe production requires attention to control points:
1, capillary
The wall thickness 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, review
Compared with ordinary cold-drawn steel tubes, the production of cold-drawn precision seamless tubes increases the pickling process of hot-rolled capillary 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 free from folding and severe scoring. , pits and other defects of the capillary.
3, tools
The surface smoothness of the tools used for the production of cold drawn precision seamless steel tubes is generally Ra0.4 or higher, the dimensional accuracy is above H3, and the hardness is 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
In the process of sulfuric acid pickling, precision seamless steel pipes tend to form “black slag” mainly consisting of Fe2O3 and Fe3O4, and form surface black spots in the subsequent 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.

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