Title

EFFECT OF THE REPLACEMENT OF TURBULENCE INHIBITORS BY DAMS IN THE TUNDISH OF CONTINUOUS SLAB CASTING

EFFECT OF THE REPLACEMENT OF TURBULENCE INHIBITORS BY DAMS IN THE TUNDISH OF CONTINUOUS SLAB CASTING

Authorship

MARTINS, RODRIGO SEARA; MENDONÇA, ALEXANDRE DE FREITAS GOMES DE; MELO, PEDRO HENRIQUE RESENDE VAZ DE

MARTINS, RODRIGO SEARA

I am this author

MENDONÇA, ALEXANDRE DE FREITAS GOMES DE

I am this author

MELO, PEDRO HENRIQUE RESENDE VAZ DE

I am this author

DOI

10.5151/2594-5300-40879

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Abstract

IMPROVING STEEL CLEANLINESS COMBINED WITH COST REDUCTION ARE ONGOING ACTIVITIES IN STEELWORKS. CASTER TUNDISH FLOW MODIFIERS ARE TARGETS OF SEVERAL APPLICATION FEASIBILITY ANALYSIS IN THIS CONTEXT. AMONG THEM, THE TURBULENCE INHIBITOR HAS THE FUNCTIONS OF REDUCING THE SPEED ENTRANCE OF THE STEEL THAT CAME FROM THE LADLE AND PROMOTING AN ASCENDING STEEL FLOW, FACILITATING THE FLOTATION OF INCLUSIONS. USIMINAS USES TUNDISH WITH TURBULENCE INHIBITOR. ONE OPTION TO REPLACE IT IS THE USE OF DAMS, WHICH CAN DIRECT THE STEEL FLOW TO THE FREE SURFACE OF THE TUNDISH WITH LOWER APPLICATION COSTS. IN THIS STUDY WERE EVALUATED 147 HEATS IN TUNDISH WITH DAMS AND COMPARED WITH ONES THAT USED A TURBULENCE INHIBITOR, AS A STANDARD CONDITION. INCLUSION ANALYSIS TECHNIQUES SUCH AS OPTICAL MICROSCOPY AUTOMATIC INCLUSION ANALYSIS TOTAL OXYGEN CONTENT AND NITROGEN PICK-UP WERE USED IN SAMPLES FROM SECONDARY REFINING AND TUNDISH TO COMPARE BOTH CONDITIONS. FURTHERMORE, THE OPERATIONAL PERFORMANCE WAS ANALYZED CONSIDERING STEEL SPLASHING AT OPERATION START. ALSO, THE RATE OF QUALITY REJECTION WAS EVALUATED, WHICH PROVED TO BE WITHIN REGULAR LIMITS. THIS FINDING WAS EXPECTED SINCE THE INCLUSION REMOVAL EFFICIENCY WAS MAINTAINED, AND THE OPERATION OCCURRED WITHOUT ABNORMALITY.

IMPROVING STEEL CLEANLINESS COMBINED WITH COST REDUCTION ARE ONGOING ACTIVITIES IN STEELWORKS. CASTER TUNDISH FLOW MODIFIERS ARE TARGETS OF SEVERAL APPLICATION FEASIBILITY ANALYSIS IN THIS CONTEXT. AMONG THEM, THE TURBULENCE INHIBITOR HAS THE FUNCTIONS OF REDUCING THE SPEED ENTRANCE OF THE STEEL THAT CAME FROM THE LADLE AND PROMOTING AN ASCENDING STEEL FLOW, FACILITATING THE FLOTATION OF INCLUSIONS. USIMINAS USES TUNDISH WITH TURBULENCE INHIBITOR. ONE OPTION TO REPLACE IT IS THE USE OF DAMS, WHICH CAN DIRECT THE STEEL FLOW TO THE FREE SURFACE OF THE TUNDISH WITH LOWER APPLICATION COSTS. IN THIS STUDY WERE EVALUATED 147 HEATS IN TUNDISH WITH DAMS AND COMPARED WITH ONES THAT USED A TURBULENCE INHIBITOR, AS A STANDARD CONDITION. INCLUSION ANALYSIS TECHNIQUES SUCH AS OPTICAL MICROSCOPY AUTOMATIC INCLUSION ANALYSIS TOTAL OXYGEN CONTENT AND NITROGEN PICK-UP WERE USED IN SAMPLES FROM SECONDARY REFINING AND TUNDISH TO COMPARE BOTH CONDITIONS. FURTHERMORE, THE OPERATIONAL PERFORMANCE WAS ANALYZED CONSIDERING STEEL SPLASHING AT OPERATION START. ALSO, THE RATE OF QUALITY REJECTION WAS EVALUATED, WHICH PROVED TO BE WITHIN REGULAR LIMITS. THIS FINDING WAS EXPECTED SINCE THE INCLUSION REMOVAL EFFICIENCY WAS MAINTAINED, AND THE OPERATION OCCURRED WITHOUT ABNORMALITY.

Keywords

Tundish; Flow modifiers; Non-metallic inclusions.

Tundish; Flow modifiers; Non-metallic inclusions.