Russian steel giant PJSC Severstal has resumed supplies to Alfapipe, a spiral welded pipe manufacturer in Algeria. For the client, the metallurgists produced 26 thousand tonnes of X70 strip steel coils. Rolled metal was produced at mill 2000 at the Cherepovets Metallurgical Plant. Opportunities for the selection of the optimal technology significantly expanded after the reconstruction of the 2000 laminar mill. The investment project worth 2 billion rubles, implemented in the fall of 2019, provided for the replacement of the old 1975 installation with a new generation of equipment. The modernization made it possible to improve the cooling accuracy of the strip after hot rolling on the 2000 mill to obtain uniform mechanical properties along the length and width. This will help avoid problems with Severstal's metal processing in pipe production. In addition, the new laminar cooling unit allows obtaining the properties of rolled metal. To fulfill the order, the employees of the Directorate for Technical Development and Quality of the Severstal Russian Steel Division and the flat-rolled product of CherMK adjusted the production technology of X70 steel, taking into account the capabilities of the new equipment. As a result, specialists changed the microstructure of rolled products and achieved higher strength due to a significant increase in the cooling rate.
Another requirement was quite tight thickness tolerances along the entire length of the coil. The recent modernization of hydraulic pressure devices at the 2000 mill helped the metallurgists cope with this task.
The production and delivery of rolled metal at the request of the client was carried out in batches within three months from July to September.