Stainless steel seamless tube production steps
1, selection of high quality standard 304, 316L stainless steel raw material tube blank by punching, starting, annealing and other operations.
2, after the completion of the above operation is followed by the multi-pass cold drawing (cold rolling) process, the cold rolling of the pipe is carried out on the multi-roll mill, and the stainless steel pipe is rolled in the annular hole composed of the variable section hole slot and the fixed conical head.
3, after cold rolling of stainless steel pipe will appear the coefficient of strength is large, should not be flaming, bending and other phenomena, in order to achieve the sanitary standards of stainless steel pipe, cold rolling of the pipe also need to carry out bright annealing, demagnetization, pickling, straightening and other steps.
5, stainless steel pipe pickling process, pipe parts in the pickling passivation at the same time can remove the surface of the workpiece oil, rust spots, welding spots, oxide layer, free iron and other dirt, the surface after treatment becomes uniform silver white, while preventing metal corrosion and hydrogen embritculation phenomenon, inhibition of acid fog.
6, stainless steel tube after the above process, the following is the polishing process, the standard for the pipe wall, outer wall polishing mesh 400 mesh, tube inside and outside surface roughness after polishing treatment can be up to the mirror standard grade (i.e., sanitation standard).
7, polished stainless steel pipe needs to go through the metal flaw detection machine (or hydraulic test) for internal inspection and steel pipe quality inspector strict manual selection, qualified products can be packaged and shipped.
Two, the production process of stainless steel seamless pipe.
Production process: 1, steelmaking →2, rolling round steel (pickling) →3, perforation (annealing) →4, cold drawing →5, cold rolling (annealing, demagnetization, pickling, cleaning) →6, inner wall polishing (400 mesh) →7, outer wall polishing (400 mesh) →8, pressure detection →9, surface detection →10, label and qualification certification →11, packaging →12, factory