METHOD FOR PRODUCTION OF ACID-RESISTANT HIGH PURITY PIPELINE STEEL Russian patent published in 2022 - IPC C21C5/28 C21C7/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy and can be used in production of acid-resistant pipeline steel of high purity. Molten iron is preheated, oxygen is kept in the converter in the state of high carbon content and low oxygen content, performing decarburization in a circulation vacuum apparatus, fusion in a circulation vacuum apparatus and vacuum degassing, preventing increase in carbon content and performing a process of fast desulphurization and slagging of molten iron in a refining ladle furnace. Control of carbon content in molten iron is ensured by optimization of oxygen retention and slagging systems during tapping in converter, decarburization and fusion process in furnace with circulation vacuumization, slagging process by diffuse deoxidation in ladle furnace, as well as rational control of argon blowing to the bottom of the ladle during the melting process.

EFFECT: invention enables to produce steel with high degree of purity and high quality of castings, wherein content of inclusions in steel sheet in range of 1,5 is controlled so that it is higher than 99 %.

9 cl, 1 dwg, 8 tbl