Publication detail
Breakout of a Slab as the Result of Changes in the Thermo-physical Properties of Continuously Cast Steel
KAVIČKA, F. DOBROVSKÁ, J. STRÁNSKÝ, K. SEKANINA, B. ŠTĚTINA, J. MAUDER, T. MASARIK, M.
Czech title
Průval bramy jako důsledek změn termofyzikálních vlastností kontinuálně odlévané oceli Průval bramy jako důsledek změn termofyzikálních vlastností kontinuálně odlévané oceli Průval bramy jako důsledek změn termofyzikálních vlastností kontinuálně odlévané oceli
English title
Breakout of a Slab as the Result of Changes in the Thermo-physical Properties of Continuously Cast Steel
Type
journal article - other
Language
en
Original abstract
The so called secondary cooling zone is an important part of the continuous casting machine. In this zone a breakout may occur due to an increase of the local and temperature heterogeneity of steel, resulting from an increase of the stress caused by bending of the slab and by high local concentration of non-metallic slag inclusions. Changes of the chemical composition of steel during continuous casting are particularly dangerous. In the event that two melts are cast one right after another, i.e. if the melt of steel with chemical composition A ends and it is immediately followed by the steel B, it may automatically stop the CCM and an atypical breakout may take place. It happened during continuous casting of the slab. 250x1530 mm in the area of straightening, 20 minutes after flying change of tundish. In the present paper, by employing the dimensional analysis, eight dimensionless numbers are derived. If the values of this dimensionless numbers for two immediately followed steels significant differs, the atypical breakout may take place.
Czech abstract
Tak zvaná sekundární zona chlazení je důležitá část kontinuálního licího stroje. V ní se může vyskytnout průval vlivem vzrůstajících lokální a teplotní heterogenity oceli, vzrůstem napětí při narovnávání bramy a vysokých koncentrací nekovových příměsí. Zvláště nebezpečné jsou při kontinuálním odlévání změny chemického složení, když po oceli A bezprostředně následuje podstatně odlišná ocel B. Použitím dimenzionální analyzy bylo odvozeno osm kriterií podobnosti, která umožňují posoudit nebezpečí vzniku tohoto atypického průvalu.
English abstract
The so called secondary cooling zone is an important part of the continuous casting machine. In this zone a breakout may occur due to an increase of the local and temperature heterogeneity of steel, resulting from an increase of the stress caused by bending of the slab and by high local concentration of non-metallic slag inclusions. Changes of the chemical composition of steel during continuous casting are particularly dangerous. In the event that two melts are cast one right after another, i.e. if the melt of steel with chemical composition A ends and it is immediately followed by the steel B, it may automatically stop the CCM and an atypical breakout may take place. It happened during continuous casting of the slab. 250x1530 mm in the area of straightening, 20 minutes after flying change of tundish. In the present paper, by employing the dimensional analysis, eight dimensionless numbers are derived. If the values of this dimensionless numbers for two immediately followed steels significant differs, the atypical breakout may take place.
Keywords in Czech
Ocelová brama, kontinuální lití, chemická a teplotní heterogenita, průval, bezrozměrná čísla
Keywords in English
Steel slab, Continuous casting; Chemical and temperature heterogeneity; Breakout; Dimensionless number.
RIV year
2013
Released
10.07.2013
Publisher
Wiley Pub.
ISSN
8756-758X
Volume
2013
Number
2
Pages from–to
1–10
Pages count
10
BIBTEX
@article{BUT101060,
author="František {Kavička} and Jana {Dobrovská} and Karel {Stránský} and Bohumil {Sekanina} and Josef {Štětina} and Tomáš {Mauder} and Miloš {Masarik},
title="Breakout of a Slab as the Result of Changes in the Thermo-physical Properties of Continuously Cast Steel",
year="2013",
volume="2013",
number="2",
month="July",
pages="1--10",
publisher="Wiley Pub.",
issn="8756-758X"
}