Fine-rolled steel pipe is the finely-rolled seamless steel pipe. The main production process of seamless steel pipe is heating billet and billet, perforation of billet, extension of steel pipe, rolling of steel pipe, sizing and reducing of steel pipe, cooling and finishing of steel pipe or heating of steel embryo, piercing, hot binding, pickling, cold drawing, carbon burning, cutting head, spraying mark, package. Cold-drawn steel pipes are loaded and finished at room temperature, in order to increase the yield point strength of steel bars and save steel, the tensile stress exceeding the original yield point strength of steel bars is forced to stretch steel bars so as to produce plastic deformation of steel bars. 精軋鋼管的概念：以節約鋼材、提高鋼筋屈服強度為目的，以超過屈服強度而又小於極限強度的拉應力拉伸鋼筋，使其產生塑性變形的做法叫鋼筋冷拉。產品廣泛應用於：機械設備：木工機械、陶瓷機械、造紙機械、玻璃機械、食品機械、建築機械、塑料機械、紡織機械、千斤頂、液壓機等。
The concept of finish rolling steel pipe: for the purpose of saving steel and improving the yield strength of steel bars, the method of cold drawing of steel bars is to produce plastic deformation by stretching steel bars under tension stress which exceed the yield strength and are less than the ultimate strength. Products are widely used in: machinery and equipment: woodworking machinery, ceramic machinery, paper machinery, glass machinery, food machinery, construction machinery, plastic machinery, textile machinery, jacks, hydraulic presses and so on.
The working principle of the magnetic mechanical oil seal: the magnetic mechanical oil seal consists of a static ring and a moving ring. The material of the static ring is a high strength magnetic stainless steel alloy, which is installed in the seal seat. The moving ring is installed on the rotating shaft, which is inlaid with magnetic material, and the ring is inlaid with wear-resistant and lubricating sealing material made of carbon and graphite. When the magnetic oil seal dynamic and static rings of the finishing rolling steel pipe are installed and fitted, the magnetic force of the magnetic material on the dynamic rings always ensures that the dynamic and static rings are closely fitted, regardless of whether the rotating shaft rotates or not, so as to achieve the sealing effect. The working principle of magnetic oil seal makes it realize zero leakage at high, low speed and static state. In addition, the oil seal has the advantages of long service life, simple structure and small maintenance workload.