Production of cold-drawn precision seamless steel tube

    1. Hair management. The wall thickness of the capillary should be uniform, with fewer defects on the inner and outer surfaces. Equipment for polishing external surfaces and cleaning internal hole defects shall be provided.

    2. Review. In the production of cold drawn precision seamless steel tubes, compared with ordinary cold drawn steel tubes, hot rolling capillary pickling and re-inspection processes are added. This is to ensure that there are no defects such as folds and cracks on the outer surface of the capillary, and to eliminate defects such as folds, severe marking and linen surface on the inner surface of the capillary.

    3. Tools. The surface finish of the tools used in the production of cold-drawn precision seamless steel tubes should be controlled. At the same time, the head or mould is prevented from being stuck during the drawing process.

    4. The production process of cold-rolled seamless steel pipe is generally more complicated than that of hot-rolling. If the surface does not respond to cracks, the round pipe is cut and cut into a billet with a length of about one meter. Annealing is a very important part in the production process of cold drawn steel pipes. The quality of annealing not only affects the performance of the steel pipe, but also affects the removal of scale.

    5. In the pickling process of precision seamless steel tubes, black slag is easily formed, and in subsequent production, black spots will form on the surface. Black residue is easily soluble in hydrochloric acid. In order to prevent the formation of black spots, hydrochloric acid should be added to the acid tank.

    6. Resin should be used as lubricant. Compared with phosphating and lubrication, lubrication has obvious differences. The drawn steel pipe has the characteristics of an iron matrix, which not only has high finish, but also has the beautiful appearance of cold-rolled steel pipe.