Steel Quality: Role of Secondary Refining & Continuous Cast

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About Course

Steel Quality: Role of Secondary Refining & Continuous Cast.

The quality of steel plays an important role in imparting the specific application requirements to the product. Cleanliness and the absence of defects are two broad facets of the quality of a steel product. This course aims to briefly introduce the importance of secondary refining and continuous casting in achieving the desired cleanliness and surface quality of the cast and hot-rolled steels.

INTENDED AUDIENCE: Undergraduate, postgraduate, and graduate students of Metallurgical and Materials

What Will You Learn?

  • 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 mold
  • 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 mold oscillation, Effect of steel chemistry and segregation
  • Week 8: Deleterious effect of P and S, Role of strength & toughness of the solid shell
  • Week 9: Factors responsible for bulging vis-a-vis depression behavior, 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

Course Content

Steel Quality : Role of Secondary Refining & Continuous Cast

  • Concept of Steel Quality
    00:00
  • Typical Examples of Surface Defects
    00:00
  • Origin of Common Quality Problems
    00:00
  • Present Scenario on Quality Demands
    00:00
  • Control of Residuals and Impact on Quality
    00:00
  • Non-Metallic Inclusions
    00:00
  • Evaluation of Residuals and Inclusions
    00:00
  • Cleanliness Requirements for Different applications
    00:00
  • Limitation of Primary Steelmaking & Importance of secondary Refining
    00:00
  • Deoxidation
    00:00
  • Prevention of Slag carryover
    00:00
  • Desulphurisation
    00:00
  • Degassing
    00:00
  • Secondary Refining Processes
    00:00
  • Injection of Calcium
    00:00
  • Decarburisation
    00:00
  • Cleanliness Measures in Ladle and Tundish
    00:00
  • Cleanliness Measures in Mould
    00:00
  • Different Routes and Temperature Control
    00:00
  • Nature and Distribution of Entrapments in Casting
    00:00
  • Sources of Exogenous Entrapments
    00:00
  • Effect of Vertical vis-a-vis Curved Mould
    00:00
  • Quality of Cast Product
    00:00
  • Role of Concast Process, Caster Design and Steel Grade
    00:00
  • Primary Cooling in Caster Mould
    00:00
  • Heat Transfer in Mould
    00:00
  • Cast Structure and Dendrite Size
    00:00
  • Role of Mould Oscillation
    00:00
  • Role of Chemistry : Part I
    00:00
  • Role of Chemistry : Part II
    00:00
  • Role of Segregation : Part I
    00:00
  • Role of Segregation : Part II
    00:00
  • Deleterious Effect of Phosphorus
    00:00
  • Strength of Solidifying Strand
    00:00
  • Brittle Zone Near Solidus
    00:00
  • Strength and Toughness of Solid Shell
    00:00
  • Role of Chemistry on Solidification Behaviour
    00:00
  • Sticking vis-a-vis Depression Behaviour
    00:00
  • Role of Chemistry on Bulging or Depression Tendency : Part I
    00:00
  • Role of Chemistry on Bulging or Depression Tendency : Part II
    00:00
  • Effect of Cast Grain Size
    00:00
  • Brittle Temperature Regions
    00:00
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