Steel Quality: Role of Secondary Refining & Continuous Casting

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 steelsINTENDED AUDIENCE: Undergraduate, post graduate and graduate students of Metallurgical and MaterialsPRE REQUISITE : NilINDUSTRY SUPPORT : All steel producers and users will be interested in this course

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