Modification of oxide inclusions in calcium-treated Al-killed high sulphur steels

Veerababu Gollapalli, M.B.Venkata Rao, P.S. Karamched, Chenna Rao Borra, G.G. Roy, Prakash Srirangam

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    Abstract

    A study has been carried out to understand the modification of alumina inclusions in Al-killed high sulphur steel with calcium treatment. For calcium treatment to be effective, a general practice is to desulphurise the steel to prevent the formation of solid CaS inclusions that are harmful to steel quality and final properties. To avoid this additional desulphurising step, the authors developed a new approach of calcium treatment of steel at an industrial scale. This approach involves treating the liquid steel with calcium treatment at low aluminium levels which enables formation of liquid calcium aluminate inclusions (C12A7) in the melt and then adding remaining amount of required aluminium. Based on this principle, Al-S diagram has been developed and calcium treatment has been modified accordingly. The inclusion transformation and morphology were studied using scanning electron microscope /energy dispersive spectroscopy analysis and. activity of CaS was calculated.

    Original languageEnglish
    Pages (from-to)663-670
    JournalIronmaking & Steelmaking: processes, products and applications
    Volume46 (2019)
    Issue number7
    DOIs
    Publication statusPublished - 2018

    Bibliographical note

    Accepted Author Manuscript

    Keywords

    • aluminium-killed steel
    • billet
    • calcium aluminates
    • high sulphur
    • Inclusion
    • oxy-sulphides

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