The Influence of Thermal Stresses and Strand Bending on Surface Defects Formation in Continuously Cast Strands

Improvement of slab surface quality is a very important goal in continues casting process of steel. It is closely coupled with casting line productivity and tendency to increase casting speed. In such a case rapid cooling of strand surface mast be employed. It results in thermal stresses development...

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Bibliographic Details
Published in:Archives of metallurgy and materials 2011-06, Vol.56 (2), p.367-377
Main Authors: Hadała, B., Cebo-Rudnicka, A., Malinowski, Z., Gołdasz, A.
Format: Article
Language:English
Subjects:
Algorithms
Arc cutting
Casting defects
Casting machines
Continuous casting
Cooling
Cracks
Finite element method
Heat transfer
Molds
Radiation
Slab casting
Solidification
Strain
Strands
Stress distribution
Surface cracks
Surface defects
Surface properties
Temperature distribution
Thermal stress
Transient heat transfer
Transport equations
Velocity
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Summary:Improvement of slab surface quality is a very important goal in continues casting process of steel. It is closely coupled with casting line productivity and tendency to increase casting speed. In such a case rapid cooling of strand surface mast be employed. It results in thermal stresses development and formation of surface cracks if casting speed, cooling conditions or the arc of casting machine are not appropriate. The strain and stress fields in continuously cast strand have been determined based on the developed thermo-mechanical model and finite element software. It allowed to calculate variation of selected criterions integrals over the hole casting line starting from solidification process in the mould and ending at cutting section. Steady solution to heat transfer equation has been used to calculate strand temperature field. Mould temperature has been calculated from the three dimensional transient model. Finite element method has been employed to build steady and transient heat transfer models. Finite element solution accuracy to the temperature field has been improved. New algorithm of the solidification heat handling has been developed to stabilize a steady solution to the heat transport equation. Damageability of the strand has been evaluated based on four fracture criterions.
ISSN:1733-3490
2300-1909
DOI:10.2478/v10172-011-0039-3