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Cold drawn stainless steel tube manufacturing process

Cold drawn (rolled) seamless steel pipe: round billet → heating → perforation → head → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → water Pressure test (inspection) → mark → storage. The rolling method of cold drawn (rolled) seamless steel pipe is more complicated than hot rolling (extrusion seamless steel pipe).

The first three steps of their production process are basically the same. The difference begins with the fourth step. After the round billet is hollowed out, it is required to start and anneal. After annealing, it is acid washed with a special acidic liquid. After pickling, apply oil. This is followed by a multi-pass cold drawing (cold rolling) of the blank tube, followed by a special heat treatment.

After heat treatment, it is straightened. After the steel pipe is straightened, it is sent to a metal flaw detector (or water pressure test) by a conveyor belt for internal flaw detection. If there are cracks inside the steel pipe, bubbles and other problems will be detected. After the quality inspection of the steel pipe, it must be carefully selected by hand. After the quality inspection of the steel pipe, the paint is sprayed with the number, specification, production batch number, etc. It is hoisted into the warehouse by a crane.

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