The production of low-carbon, low-alloy steel coils for oil-industry pipe is considered from a metal-physics perspective. The selection of cooling conditions for the steel sheet and coils after rolling is of particular importance here. Analysis of the accompanying structure formation is based on thermokinetic diagrams plotted by means of data from a deformational dilatometer. To ensure the required mechanical properties and corrosion resistance of Severkor K52 steel sheet, the corresponding structural and phase composition is formed by appropriate laminar cooling of the strip on the roller conveyer at the exit from the broadstrip rolling mill. An industrial experiment permits the production of rolled sheet with the specified mechanical and operational properties on a 2000 rolling mill.
The investigating results are given in the article for the deoxidizing effect on the non-metallic inclusion compositions tubes steels melted in the vacuum induction furnaces with periclase lining. The oxygen thermodynamic activity was calculated for the lanthanum, cerium, alumina and yttrium melts during four heats. The magnesia spinel inclusion's formation condition was evaluated depending on the deoxidizer's used and on the deoxidizing depth. It was shown how the reduced alumina concentration during the steel ladle treatment governs the non-metal inclusions' compositions and on the possibility of their modification during the commercial tubes steels melting.
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