ISSN 2594-5297
49º Seminário de Laminação — vol. 49, num.49 (2012)
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Abstract
Since the startup of the second Reheating Furnace in 2009, ArcelorMittal Tubarão has increased its hot rolled coil output towards the 4,0 Mtons/year-nominal capacity. One major issue in order to achieve this target is to increase the rolls campaigns and reduce the mill downtime dedicated to the roll changes. Among the continuous developments with strategic and reliable suppliers, the evolution of Roughing Mill work rolls outstands as a successful case, where static Cast Iron rolls used in the mill startup (2002) were sustainably replaced step by step to Chrome Steel and Enhanced Chrome Steel rolls till to the current spun Cast High Speed Steel grades. This migration involved many routine inspection and control adaptations at the Roll Shop (including new automatic Non Destructive Testing devices in the grinding machine), adjustments in the mathematical model of the Roughing Mill and personnel training. Also, it is mandatory to point out the development strategy, grounded on strict operational standardization and stability associated to the close partnership between ArcelorMittal Tubarão and ESW, with strong technical knowledge and capacity to understand the needs and to assertively design a customized product. As the main result of the development, target campaigns were risen from 13kt up to 75 kt, which represents 1,45% increase in the annual mill availability. The different targets and other achieved benefits will be presented in detail.
Since the startup of the second Reheating Furnace in 2009, ArcelorMittal Tubarão has increased its hot rolled coil output towards the 4,0 Mtons/year-nominal capacity. One major issue in order to achieve this target is to increase the rolls campaigns and reduce the mill downtime dedicated to the roll changes. Among the continuous developments with strategic and reliable suppliers, the evolution of Roughing Mill work rolls outstands as a successful case, where static Cast Iron rolls used in the mill startup (2002) were sustainably replaced step by step to Chrome Steel and Enhanced Chrome Steel rolls till to the current spun Cast High Speed Steel grades. This migration involved many routine inspection and control adaptations at the Roll Shop (including new automatic Non Destructive Testing devices in the grinding machine), adjustments in the mathematical model of the Roughing Mill and personnel training. Also, it is mandatory to point out the development strategy, grounded on strict operational standardization and stability associated to the close partnership between ArcelorMittal Tubarão and ESW, with strong technical knowledge and capacity to understand the needs and to assertively design a customized product. As the main result of the development, target campaigns were risen from 13kt up to 75 kt, which represents 1,45% increase in the annual mill availability. The different targets and other achieved benefits will be presented in detail.
Keywords
Work rolls development; Roughing mill; Spun cast high speed steel.
Work rolls development; Roughing mill; Spun cast high speed steel.
How to refer
Murad, Bruno Bastos da Silva;
Souza, Denilson de Aquino;
Costa, Roberto de Oliveira;
Carneiro, Mônica Pedrada Soares;
Brandner, Michael;
Nylen, Tommy;
Mayr., Alexander.
DEVELOPMENT OF ROUGHING MILL WORK ROLLS AT
ARCELORMITTAL TUBARÃO
,
p. 629-639.
In: 49º Seminário de Laminação,
Rio de Jabeiro,
2012.
ISSN: 2594-5297
, DOI 10.5151/2594-5297-22636
