Publication detail

Changes of the Chemical Composition of Continuously Cast Steel Slab and their Relation to Breakout

KAVIČKA, F. DOBROVSKÁ, J. STRÁNSKÝ, K. SEKANINA, B. ŠTĚTINA, J. MAUDER, T.

Czech title

Změny chemického složení kontinuálně lité bramy a jeho vztah k průvalu Změny chemického složení kontinuálně lité bramy a jeho vztah k průvalu

English title

Changes of the Chemical Composition of Continuously Cast Steel Slab and their Relation to Breakout

Type

conference paper

Language

en

Original abstract

The solidification and cooling of a continuously cast slab and the simultaneous heating of the mold is a very complicated problem of three-dimensional (3D) transient heat and mass transfer. The solving of such a problem is impossible without numerical models of the temperature field of the concasting processed through the concasting machine. Experimental research and measurements have to take place simultaneously with numerical computation, to be confronted with the numerical model and make it more accurate throughout the process. An important area of the caster is the secondary cooling zone, which is subdivided into thirteen sections. In this zone, where the slab is beginning to straighten the breakout of the shell can occur in points of increased local chemical and temperature heterogeneity of the steel, from increased tension as a result of the bending of the slab and also from a high local concentration of non-metal and slag inclusions. Especially dangerous are the changes in the chemical composition of the steel during the actual concasting. In the case of two melts one immediately after the other, this could lead to immediate interruption in the concasting and a breakout. The material, physical, chemical and technological parameters, which both melts differed in were determined. If the dimensionless analysis is applied for assessing and reducing the number of these parameters, then it is possible to express the level of risk of breakout as a function of five dimensionless criteria.

Czech abstract

Pro tuhnutí a chlazení kontinuálně lité bramy byl prováděn experimentální výzkum a měření současně s numerickým výpočtem. V sekundární zoně chlazení, kde dochází k narovnávání bramy, se může vyskytnout průval v důsledku vzrůstající lokální chemické a teplotní heterogenity oceli, rostoucích napětí a vysokých lokálních koncentrací nekovových vměstků. Zvláště nebezpečné jsou změny v chemickém složení v průběhu odlévání dvou po sobě následujících taveb. Pro stanovení míry rizika vzniku průvalu byla odvozena bezrozměrná kriteria zahrnující fyzikální a chemické parametry materiálů a technologické parametry.

English abstract

The solidification and cooling of a continuously cast slab and the simultaneous heating of the mold is a very complicated problem of three-dimensional (3D) transient heat and mass transfer. The solving of such a problem is impossible without numerical models of the temperature field of the concasting processed through the concasting machine. Experimental research and measurements have to take place simultaneously with numerical computation, to be confronted with the numerical model and make it more accurate throughout the process. An important area of the caster is the secondary cooling zone, which is subdivided into thirteen sections. In this zone, where the slab is beginning to straighten the breakout of the shell can occur in points of increased local chemical and temperature heterogeneity of the steel, from increased tension as a result of the bending of the slab and also from a high local concentration of non-metal and slag inclusions. Especially dangerous are the changes in the chemical composition of the steel during the actual concasting. In the case of two melts one immediately after the other, this could lead to immediate interruption in the concasting and a breakout. The material, physical, chemical and technological parameters, which both melts differed in were determined. If the dimensionless analysis is applied for assessing and reducing the number of these parameters, then it is possible to express the level of risk of breakout as a function of five dimensionless criteria.

Keywords in Czech

kontinuálně odlévaná brama, oscilační vrásky, hooky, chemické složení, průval, bezrozměrná kriteria

Keywords in English

concast slabs, oscillation marks, hooks, chemical composition, breakout, dimensionless criteria

RIV year

2012

Released

19.09.2012

Publisher

University of Parma

Location

Parma, Italy

ISBN

9788895940441

Book

The 4th International Conference on Crack Paths (CP 2012). Book of Abstracts and CD

Edition number

1

Pages from–to

89–89

Pages count

1

BIBTEX


@inproceedings{BUT94029,
  author="František {Kavička} and Jana {Dobrovská} and Karel {Stránský} and Bohumil {Sekanina} and Josef {Štětina} and Tomáš {Mauder},
  title="Changes of the Chemical Composition of Continuously Cast Steel Slab and their Relation to Breakout",
  booktitle="The 4th International Conference on Crack Paths (CP 2012). Book of Abstracts and CD",
  year="2012",
  month="September",
  pages="89--89",
  publisher="University of Parma",
  address="Parma, Italy",
  isbn="9788895940441"
}