Technology for manufacturing of low non-siliceous steel grades with continuous casting machines

Given technology solves the main problems of producing low non-siliceous steel grades, namely:

  • lack of  subcortical bulb in an ingot;
  • lack of overgrowing of steel casting cups and dosing cups;
  • good casting process;
  • control and regulation of oxygen activity during the process of casting with an opportunity to reduce its content in a ladle to less than 20 ppm;
  • high coefficient of calcium and aluminum assimilation;
  • considerable reduction of costs in comparison to the known technologies.

Given technology provides the following technical result:

  • obtaining of high-quality low non-siliceous steel grades;
  • raising the degree of desulphuration of low non-siliceous steel with the mass fraction of silicon of not more than 0,05%, enabling to obtain content of sulphur with the mass fraction of not more than 0,010% in finished metal;
  • globularization of sulfide impurities in the mentioned steel due to their conversion into sulphides and oxysulphides of calcium low deformable during rolling, which causes growth of plasticity and impact strength of finished rolled metal;
  • transformation of solid impurities of alumina into liquid (in the presence of the temperature of casting) calcium aluminates, that come to the surface and assimilate with clinker easily, eliminating by this a possibility of overgrowing of openings of casting cups with accumulation of solid impurities of alumina;
  • possibility of carrying out steel finishing in an intermediate ladle with the purpose of improving quality, decreasing calcium consumption and advancing the process of casting.

 

Steelmaking

 
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