Strategy to minimise central segregation in high carbon steel grades during billet casting

Abstract

Corus R,D&T (formerly British Steel), Teesside Technology Centre together with Scunthorpe Works, ISPAT-Hamburger Stahlwerke, Sidenor IzD and Corus NL (formerly Hoogovens) completed in 2002 an extensive ECSC supported study to evaluate techniques to optimise the central segregation during the continuous casting of high carbon billets. The study included the application of intense secondary cooling, thermal soft reduction, final electromagnetic stirring (EMS), reduced and controlled superheat casting and mechanical soft reduction. In addition, the influence of casting process variables (casting speed, open and submerged pouring etc.) and their interaction with the technologies studied was investigated. From the investigations on the casting machines of the four partners in the project it was possible to recommend an optimum strategy for the minimisation of segregation in the casting of high carbon billets.

Development and Application of Final Permanent Magnet Stirring during Continuous Casting of High Carbon Rectangular Billet

“…Jie ZENG, 1) * Weiqing CHEN, 1) Senlin ZHANG, 2) Yi LI 3) and Qiuliang WANG (Received on April 17, 2015; accepted on June 15, 2015) Production of continuously cast high carbon steel that very low center macrosegregation is an important object in meeting high quality requirements. Apart from the widely known methods of reducing macrosegregation during continuous casting, final permanent magnet stirring (FPMS) provides an alternative for producing steel with low macrosegregation.…”

“…[1][2][3] The continuous casting of high carbon 82A steel with a section size of 180 mm × 240 mm has been improved considerably by low temperature casting and proper using of final electromagnetic stirring (FEMS), but their center carbon segregation appears not to be enough to satisfy customer's demand for best quality. Center segregation in high carbon steel results in a high concentrations of chemical components especially carbon element and has great influence on the quality of final product.…”

Numerical Simulation of Dendritic Growth of Continuously Cast High Carbon Steel

“…In consideration of producing safety and surface solidification quality, increasing secondary cooling intensity is an effective method to reduce the central segregation of high carbon steel billets in the practical continuous casting process, [32] whose mechanism is similar to that described above. On the other hand, with the increase of the cooling intensity, the secondary dendritic arms become more developed as shown in Figure 11 and will prevent the solute enriched at dendritic roots from being absorbed into the center liquid region to form the central segregation by the melt flow and the solidifying contraction of the billet center near the final solidification.…”

Study on the Fluid Flow in a Semi-Open-Stream-Poured Beam Blank Continuous Casting Mold with Submerged Refractory Funnels by Multiphase Modeling

“…Generally, open-stream pouring and oil lubrication are used in this situation, such as in some billet molds [1,2]. Nevertheless, it is widely known that the slag in a continuous casting mold helps to ensure even shell solidification and decreases strand surface depressions, cracks, and bleeders [3], which are more common in beam blank continuous casting.…”