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Title

SLAB RESIDENCE TIME CONTROLLED BY VARIABLE SPACE BETWEEN THE SLABS FOR DIFFERENT FINAL STRIP THICKNESS IN A WALKING BEAM TYPE REHEATING FURNACE IN A STECKEL HOT STRIP MILL PRODUCTION LINE

Authorship

Souza, Altair Lucio de; Soares, Fabio de Oliveira; Borges, Jacson Morais; Lino, Joao Junio Pereira; Cardoso, Rogério Antão; Junior, Willy Schuwarten

Souza, Altair Lucio de

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Soares, Fabio de Oliveira

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Borges, Jacson Morais

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Lino, Joao Junio Pereira

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Cardoso, Rogério Antão

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Junior, Willy Schuwarten

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DOI

10.5151/9785-9785-32338

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Abstract

IN A STECKEL HOT ROLLING MILL PRODUCTION LINE, THE PRODUCTIVITY OF THE REHEATING FURNACE IS CLOSELY RELATED TO THE ONE OF THE ROLLING MILL, BECAUSE THE ROLLING TIME INCREASES AS THE DESIRED FINAL STRIP THICKNESS IS REDUCED. THE RESIDENCE TIME RANGES FROM 180 TO 300 MINUTES DEPENDING ON THE FINAL STRIP THICKNESS. HIGHER RESIDENCE TIME AT THE HOT OXIDIZING ATMOSPHERE INSIDE THE FURNACE INTENSIFIES THE OXIDE LAYER FORMATION ON THE SLAB SURFACE CAUSING LARGE STEEL LOSSES AS WELL INCREASING THE GAS CONSUMPTION. IN THIS CONTEXT, A POSSIBLE STRATEGY TO OPTIMIZE THE RESIDENCE TIME AND THE FURNACE PRODUCTIVITY IS TO INCREASE THE SPACE BETWEEN THE SLABS DURING THE CHARGING AS THEM MOVE FASTER AND ARE HEATED FOR SHORTER TIMES AT EACH HEATING ZONE. THE PURPOSE OF THIS WORK WAS TO EVALUATE THE BETWEEN THE SLABS IN A WALKING BEAM TYPE REHEATING FURNACE CONSIDERING THE ROLLING TIME FOR ACHIEVE DIFFERENT FINAL STRIP THICKNESS IN A STECKEL MILL, SEARCHING FOR OPTIMIZE THE SLABS RESIDENCE TIME AND ITS EFFECT ON METALLIC YIELD AND IN THE SPECIFIC ENERGY CONSUMPTION BEHAVIOR.

Keywords

Walking beam furnace; Steckel Mill; Space between slabs; Productivity