Study on Assessment of Solidification Structure and Solidification Process in High-Carbon Steel Billet Continuous Casting

摘要

The quality of finished steel products largely depends on the internal quality and the as-cast structure. In this paper, solidification structure of high carbon billets was investigated under different casting conditions (such as casting speed and specific water flow, etc.). The as-cast structure, together with primary and secondary dendrite arm spacing from surface to center of the billets, have been analyzed comparatively. Center segregation could be controlled to a well degree through the implementation of soft reduction (SR) in 150mm square high-carbon steel casting. Considering micro-segregation during solidification, a non-equilibrium solidus temperature was calculated with finite difference model. Modified by the shell thickness determined by nail shooting technique, the model is adopted to calculate the solidification process more precisely. Accordingly, a reasonable crater end position has been revealed, which is beneficial to the implementation of SR operation in production.