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

Journal article (2018)

Authors

Veerababu Gollapalli Visakhapatnam Steel Plant
M.B.Venkata Rao Visakhapatnam Steel Plant
P.S. Karamched University of Oxford
C.R. Borra (OLD) MSE-1
G.G. Roy Materials Engineering Indian Institute of Technology
Prakash Srirangam University of Warwick
Research Group
(OLD) MSE-1
Copyright: © 2018 Veerababu Gollapalli, M.B.Venkata Rao, P.S. Karamched, C.R. Borra, G.G. Roy, Prakash Srirangam
DOI: https://doi.org/10.1080/03019233.2018.1443382
Inclusion Aluminium-killed steel Billet Calcium aluminates High sulphur Oxy-sulphides
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Published Date

2018

Language

English

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Research Group

(OLD) MSE-1

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.