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Title

FATIGUE IN WORK ROLLS AT TERNIUM’S PLTCM PLANT.

Authorship

Aranda-Regino, D. A.; Leduc-Lezama, L. A.; Ramírez-Cuellar, J.; Gómez-de-la-Garza, C.; Casas-Ochoa, M. A.; Rodríguez, F. D.; Mercado-Solís, R. D.; Reyes, J. Salinas

Aranda-Regino, D. A.

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Leduc-Lezama, L. A.

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Ramírez-Cuellar, J.

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Gómez-de-la-Garza, C.

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Casas-Ochoa, M. A.

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Rodríguez, F. D.

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Mercado-Solís, R. D.

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Reyes, J. Salinas

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DOI

10.5151/9785-9785-32305

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Abstract

The Pickling Line Tandem Cold Mill (PLTCM) at Ternium’s Pesqueria plant with a 5 stands, 6 high configuration started in 2013. At the time of the start up the work roll specification and grinding practices were stablished following a low risk policy to be able to sustain any start-up associated accident. Once a stable operation has been achieved both these policies are being modified to improve productivity and reduce costs. The specified hardness of the rolls has been increased and efforts are being made to optimize the grinding according to the rolling campaign length and materials. The fatigue damage in work rolls, after rolling and its removal by grinding was followed by hardness measurements made at the end of the rolling campaign and after grinding. Softening of the rolls after rolling was found mainly in final stands to be related to the averaged stress experienced during the campaign, the original roll hardness was recovered after grinding. Hardness evolution was also followed after each grinding step finding that the total amount of grinding could be reduced. The grinding practice was modified accordingly for the first stands and the yield of work rolls in them has improved.

Keywords

Fatigue