What should be the Optimum area fraction of Chill, Columnar and equiaxed zones in the cast structure of 430 mm round??

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Mohamed Dawod

nearly 4to5% chill zone 80to90% columnar zone 4to5% equiaxed zone, it depends on steel superheat for the same steel grade and secondary cooling intensity

Ranjan Kumar Pathak

Literature suggests that area fraction of Equiaxed zone should be minimum of 45%, Chill zone of 4-8%.

Equiaxed zone of less than 10% is too low to consider it a good cast structure.