Modeling of Crucial Process Parameters for the Continuous Improvement of Special Steels at the Stomana Plant
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JMEPEG https://doi.org/10.1007/s11665-018-3616-z
Modeling of Crucial Process Parameters for the Continuous Improvement of Special Steels at the Stomana Plant P. Sismanis
, M. Bouzouni, and S. Papaefthymiou
(Submitted October 29, 2017; in revised form July 15, 2018) In this study, a heat transfer model that takes under consideration the micro-segregation phenomena and has been extensively deployed for solidification studies concerning the plant casters is also applied to show the casting speed and superheat effects upon internal soundness. She solidification path of C45R, 42CrMo4, S355 grades was simulated using Thermocalc and DICTRA software in order to examine the phases formed in crucial process temperature windows for the casting. Coupled Heat Transfer/Simple MicroSegregation Model software has been deployed to simulate the effect of cooling rate on solidus temperature, and solid fraction during solidification. The solidus temperature results computed by the HT/SM and DICTRA were found to be in good agreement. However, the differences in the predicted solidification fractions may derive from the fact that DICTRA uses an average cooling rate whereas the heat transfer SM model takes into account also the local cooling rates in the solidification progress. Keywords
billet, carbon steel, continuous casting, cooling rate, solid fraction, solidus temperature
List of symbols
fS SPH
1. Introduction The need for continuous cast carbon steels blooms with more stringent quality demands in internal soundness, free from surface defects, and internal porosity has increased the research in the phenomena associated with solidification under industrial conditions. Low-carbon peritectic steels exhibit a tendency to form cracks at the mold even though there are applications that they remain indispensable. Medium and high carbon steels cover a broad range of manufacturing products; nevertheless, they exhibit relatively low liquidus and solidus temperatures, with these values decreasing even further as carbon levels increase. From the early steps of micro-segregation analysis it was verified that for any carbon steel grade the solidus temperature is greatly affected by the local cooling rate and
This article is an invited submission to JMEP selected from presentations at the Symposium ‘‘Steel Making,’’ belonging to the Topic ‘‘Processing’’ at the European Congress and Exhibition on Advanced Materials and Processes (EUROMAT 2017), held September 17-22, 2017, in Thessaloniki, Greece, and has been expanded from the original presentation. P. Sismanis, SIDENOR S.A., 33, Amaroussiou-Halandriou St, 15125 Maroussi, Athens, Greece; M. Bouzouni, ELKEME S.A., 61st km Athens-Lamia Nat. Road, 32011 Oinofyta, Viotia, Greece; and Laboratory of Physical Metallurgy, Division of Metallurgy and Materials, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9, Her. Polytechniou str., 15780 Zografos, Athens, Greece; and and S. Papaefthymiou, Laboratory of Physical Metallurgy, Division of Metallurgy and Materials, S
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