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CARBON CONTENT, SOLIDIFICATION AND STRAIN ENERGY CONSIDERATIONS DURING CONTINUOUS CASTING OF MICROALLOY STEEL

CARBON CONTENT, SOLIDIFICATION AND STRAIN ENERGY CONSIDERATIONS DURING CONTINUOUS CASTING OF MICROALLOY STEEL

Autoria

Jansto, Steven G.

Jansto, Steven G.

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DOI

10.5151/1982-9345-30181

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Resumo

Carbon content and continuous casting parameters affecting solidification behavior, such as super heat, mold level fluctuation, heat transfer, fine grain chill zone depth and other process solidification parameters directly influence the surface and internal quality of the steel strand. The carbon content, resultant fine grain chill zone depth, the equiaxed-columnar transition zone and the strain energy are the primary drivers that govern hot ductility behavior. These factors influence the propensity for crack formation during the unbending section in the continuous casting process. Elements such as microalloys exhibit secondary or tertiary root causes for crack formation and are not the primary crack formation root cause. This solidification research identifies that the traditional hot ductility as measured via the percent reduction in area (%RA) at elevated temperature grossly overstates the minimum ductility required to assure crack-free casting of microalloyed steels. The strain at the ultimate tensile strength exhibits a very high correlation coefficient with strain energy while an extremely low correlation coefficient is exhibited with %RA.

Palavras-chave

Equiaxed-columnar transition zone, Heat flux, Residual strain, Strain energy

Strain energy