Title

INCREASED WIDTH REDUCTION IN THE CSN HOT STRIP MILL

INCREASED WIDTH REDUCTION IN THE CSN HOT STRIP MILL

Authorship

SANTIAGO, GABRIEL AUGUSTO DE AVILA; ALVES, VINICIUS CARDILO CAMPOS; CUNHA, RAPHAEL ALEXSANDER RIBEIRO DA; ARAUJO, FABIO DE OLIVEIRA; ESTANECK, DALBER DA SILVA; GRIBEL, MARCEL VIEIRA; NETTO, VITOR HUGO MAIA

SANTIAGO, GABRIEL AUGUSTO DE AVILA

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ALVES, VINICIUS CARDILO CAMPOS

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CUNHA, RAPHAEL ALEXSANDER RIBEIRO DA

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ARAUJO, FABIO DE OLIVEIRA

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ESTANECK, DALBER DA SILVA

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GRIBEL, MARCEL VIEIRA

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NETTO, VITOR HUGO MAIA

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DOI

10.5151/2594-5297-42527

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Abstract

In hot strip rolling, width reduction is performed by edge mills present in the roughing unit. The width reduction capacity is an important factor in steel mills, since it is directly linked to, among other factors, the slab and coil logistics and mill productivity. On the other hand, performing high width reductions is a challenge in terms of coil quality and width uniformity. This study sought to evaluate the mathematical model of a hot strip mill and propose changes to increase the maximum width reduction practiced in the rolling line, without degrading the quality of the coils. After proposed changes, it was possible to expand the maximum width reduction to 120 mm. In terms of quality, there was an improvement of up to 42% in the occurrences of quality deviations related to the width of the coils

IN HOT STRIP ROLLING, WIDTH REDUCTION IS PERFORMED BY EDGE MILLS PRESENT IN THE ROUGHING UNIT. THE WIDTH REDUCTION CAPACITY IS AN IMPORTANT FACTOR IN STEEL MILLS, SINCE IT IS DIRECTLY LINKED TO, AMONG OTHER FACTORS, THE SLAB AND COIL LOGISTICS AND MILL PRODUCTIVITY. ON THE OTHER HAND, PERFORMING HIGH WIDTH REDUCTIONS IS A CHALLENGE IN TERMS OF COIL QUALITY AND WIDTH UNIFORMITY. THIS STUDY SOUGHT TO EVALUATE THE MATHEMATICAL MODEL OF A HOT STRIP MILL AND PROPOSE CHANGES TO INCREASE THE MAXIMUM WIDTH REDUCTION PRACTICED IN THE ROLLING LINE, WITHOUT DEGRADING THE QUALITY OF THE COILS. AFTER PROPOSED CHANGES, IT WAS POSSIBLE TO EXPAND THE MAXIMUM WIDTH REDUCTION TO 120 MM. IN TERMS OF QUALITY, THERE WAS AN IMPROVEMENT OF UP TO 42% IN THE OCCURRENCES OF QUALITY DEVIATIONS RELATED TO THE WIDTH OF THE COILS

Keywords

Hot Strip Mill, Roughing Mill, Width Reduction, Mathematical Models

Hot Strip Mill, Roughing Mill, Width Reduction, Mathematical Models