Metall. Res. Technol.
Volume 115, Number 4, 2018
|Number of page(s)||10|
|Published online||22 August 2018|
Mathematical model for prediction of hydrogen pick-up of liquid steel during filling of a continuous casting tundish
Department of Metallurgical and Materials Engineering, Engineering School, Federal University of Minas Gerais,
Ave. Presidente Antônio Carlos, No. 6627,
* e-mail: email@example.com
Accepted: 4 January 2018
Steels for several applications, such as steel cord for tires and heavy plates, present severe hydrogen restriction in their chemical composition. However, the hydrogen content of the liquid steel usually increases during tundish filling. This phenomenon, known as hydrogen pick-up, occurs due to direct steel contact with humidity present in the lining refractory, ladle sand and atmospheric air. The present work investigated by means of an analytical mathematical model the magnitude of hydrogen pick-up promoted by steel-air interaction. The relative importance of this mechanism was evaluated comparing the predictions with industrial data of hydrogen pick-up for a specific microalloyed steel grade. Results showed that air contamination can contribute to approximately 40% of the total hydrogen pick-up. An appropriate tundish inertization, which eliminates completely the air contamination, would be able to reduce approximately 1.5 ppm from the total hydrogen pick-up that happens during the beginning of the first heat of a sequence. As a consequence, it would be reduced more than 0.20 ppm of the total hydrogen pick-up in 36t of the steel cast.
Key words: hydrogen pick-up / continuous casting / tundish filling / mathematical model / air contamination
© EDP Sciences, 2018
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.