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Showing result 1 - 5 of 31 swedish dissertations matching the above criteria.

2. 1. A study of slag-steel-inclusion interaction during Ladle treatment

   Author : Johan Björklund; Pär Jönsson; Voicu Brabie; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ladle treatment; steel; slag; inclusions; ladle; refining; vacuum; tool steel; oxide activity; slag models; oxygen; equilibrium; Metallurgical process and manufacturing engineering; Metallurgisk process- och produktionsteknik;

   Abstract : The thesis is based on two supplements with two major objectives. In the first supplement equilibrium top slag-steel bulk and inclusions-steel bulk were investigated by comparison between calculated and measured oxygen activity values. This was done by applying different oxide activity models for slags combined with thermodynamic calculations. READ MORE

4. 2. Thermodynamic Aspects on Inclusion Composition and Oxygen Activity during Ladle Treatment

   Author : Johan Björklund; Pär Jönsson; Margareta Andersson; Leiv Kolbeinsen; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ladle treatment; thermodynamics; inclusions; steel; slag; equilibrium; ladle treatment; vacuum; oxide activity; oxygen activity.; Metallurgical process and manufacturing engineering; Metallurgisk process- och produktionsteknik;

   Abstract : Two industrial studies and one set of lab scale trials have been done. In addition, a theoretical study has been done. The main focus has been on non metallic inclusion composition during the ladle refining operation in industrial steel production. Sampling has been done together with careful inclusion determination. READ MORE

5. 3. A Study on the Correlation between Ladle Glaze and Non-Metallic Inclusions in the Ladle Treatment

   Author : Minho Song; Du Sichen; Jerome P. Downey; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; non-metallic inclusions; ladle treatment; ladle glaze; tracer; tool steel; viscosity; activity; modelling; Al2O3-CaO-MgO-SiO2 system; Materials science; Teknisk materialvetenskap;

   Abstract : In the present thesis, the correlation between ladle glaze and non-metallic inclusions in the ladle treatment was studied. A number of industrial trials with full scale ladle and laboratory works were performed to investigate the inclusions in the ladle treatment. READ MORE

6. 4. Study of the slag-metal interaction in ladle treatment

   Author : Pranesh Dayal; Du Sichen; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; slag-metal; mixing; interface; induction stirring; gas stirring; ladle treatment; Materialvetenskap; Materials science; Teknisk materialvetenskap;

   Abstract : .... READ MORE

7. 5. The Effect of Ladle Treatment on Steel Cleanness in Tool Steels

   Author : Karin Steneholm; Pär Jönsson; Guozhu Ye; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; oxygen activity; inclusion characteristics; vacuum degassing; desulphurization; slag; ladle; hydrogen; nitrogen; deslagging; Teknisk materialvetenskap; Materials Science and Engineering;

   Abstract : The aim of the present work was to get an overview of the steel cleanness in tool steel. Plant trial studies of three steel grades were done with different focuses.Firstly the change of the inclusion characteristics during the vacuum degassing in the ladle was looked upon. READ MORE