Oscillation Marks and Hooks on the Surface of Concast Slabs and their Relation to Breakout

Author:

Stránský Karel1,Kavička František1,Sekanina Bohumil1,Dobrovská Jana2,Stetina Josef1,Mauder T.1,Masarik M.3

Affiliation:

1. Brno University of Technology

2. VŠB - Technical University Ostrava

3. EVRAZ VITKOVICE STEEL

Abstract

In the secondary-cooling zone, where the slab is beginning to straighten out the breakout of the steel 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, 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.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

Reference5 articles.

1. Badri A. et al.: A Mold Simulator for Continuous Casting of Steel. Part II. The Formation of Oscillation Marks during the Continuous Casting of Low Carbon Steel. Metallurgical and Materials Transactions B, Volume 36 B, June 2005, pp.373-383.

2. Thomas, B.G., J. Sengupta, and Ojeda, C. Mechanism of Hook and Oscillation Mark Formation In Ultra-Low Carbon Steel. In Second Baosteel Biennial Conference, (May 25-26, 2006, Shanghai, PRC), Vol. 1, 2006, pp.112-117.

3. Ojeda, C. et al.: Mathematical Modeling of Thermal-Fluid Flow in the Meniscus Region During an Oscillation Cycle. AISTech 2006 Proceedings - Volume 1, pp.1017-1028.

4. Dobrovska, J. et al.: Analysis of a transversal crack in a steel slab. Materials Science Forum Vols. 567-568 (2007), Ó2008 Trans Tech Publications, Switzerland, pp.105-108.

5. Stetina, J. et al.: Optimization of a casting technology of a steel slab via numerical models. In Proceedings 22nd Canadian Congress of Applied Mechanics, Dalhousie University Halifax, Nova Scotia, Canada, May 2009, p.4.

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