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Steel Quality: Role of Secondary Refining and Continuous Casting

Indian Institute of Technology Madras and NPTEL via Swayam


Quality of steel plays an important role in imparting the specific application requirements to the product. Cleanliness as well as absence of defects are two broad facets of the quality of a steel product. Aim of this course is to give a brief introduction to the importance of secondary refining and continuous casting in achieving the desirable cleanliness and surface quality of cast and hot rolled steels

INTENDED AUDIENCE: Undergraduate, post graduate and graduate students of Metallurgical and Materials PRE REQUISITE : Nil INDUSTRY SUPPORT : All steel producers and users will be interested in this course


COURSE LAYOUT Week 1 : Concept of steel quality , Typical examples of common defects Week 2 : Present scenario of quality demands , Application-specific requirements of residuals and NMIs Week 3 : Limitation of primary steelmaking , Importance of different secondary refining processes Week 4 : Requirement of Calcium injection , Cleanliness measures in tundish and mould Week 5 : Nature and distribution of exogenous entrapments in casting, their sources Week 6 : Role of caster & casting process on quality , Cast structure and dendrite size Week 7 : Role of mould oscillation , Effect of steel chemistry and segregation Week 8 : Deleterious effect of P and S , Role of strength & toughness of solid shell Week 9 : Factors responsible for bulging vis-a-vis depression behaviour , Brittle temperature regions for different steel grades Week 10 : Influence of secondary cooling on cast quality , Typical cracks and other defects Week 11 : Remedial measures to control quality issues , Grade-specific casting parameters Week 12 : Identification of genesis of quality problems through metallurgical investigation

Taught by

Prof. Santanu Kr. Ray


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