The basic processes of cold-rolled and cold-drawn tubes are:
(1) Pipe material supply, the pipe materials used are hot-rolled finished pipes or semi-finished pipes, extruded pipes and welded pipes;
(2) Tube material preparation, including inspection, bundling, pickling, cleaning, rinsing, neutralizing, drying, and applying lubricant, etc .;
(3) Cold processing (cold rolling or cold drawing);
(4) Finishing of finished products includes heat treatment, straightening, sampling, head and tail cutting, inspection, hydrostatic test, oiling, packaging, and storage of finished products. Different products have different finishing contents.