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The main objective of this research was to study various refining procedures including hot metal pretreatment in order to produce economically steels with well controlled contents of phosphorus and sulphur. Three specific aspects have been considered : - the definition of the optimal hot metal composition. It has been established that, to achieve low production costs as well as the required metallurgical specifications, the optimal value for the hot metal silicon content is close to 0.35/0.4%, the manganese and the phosphorus content being respectively equal to 0.4 and 0.08%; - the application of a moderate hot pretreatment, implying low investment costs. When the optimal hot metal composition cannot be delivered directly by the blast furnace, it has been shown that a desiliconisation of the hot metal can be achieved either in the blast furnace runners or in the torpedo ladle. The desulphurisation, which remains an essential step of the refining, can be improved through the use of reagents containing magnesium; - the production of ultra low steel phosphorus levels using modified refining procedures in the converter or a post-treatment in the steel ladle.

Additional information

Authors: NYSSEN P, Centre de Recherches Metallurgiques, Liège (BE)
Bibliographic Reference: EUR 12461 FR (1989) 67 pp., MF, ECU 4, blow-up copy ECU 8.75
Availability: (2)
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