Severstal Russian Steel division’s Cherepovets Metallurgical Plant has abandoned sulphuric acid in the metal pickling process. Now production at all operating units involves hydrochloric acid etching with the regeneration of spent hydrochloric acid and its return to production. The gradual achievement of the specified operating parameters of the new continuous pickling unit No NTA 4 made it possible to decommission the NTA 2, which involved metal pickling in sulphuric acid and completely switch to a more efficient, safe and environmentally friendly technology.Continuous pickling unit N 4, which was erected as part of the development of wide-range rolled products, is now at the stage of confirming the warranty indicators. To service the complex, a modern hydrochloric acid regeneration unit URSK was erected on the site. There, a ready-made pickling solution and iron oxide are formed, which is again used in the technological chain in the production of sinter.