Title

UNDERSTANDING OF WORK ROLL CORROSION AND OXIDATION IN A HOT STRIP MILL

Authorship

Flament, Sebastien; Walmag, Gisele; Sinnaeve, Mario

Flament, Sebastien

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Walmag, Gisele

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Sinnaeve, Mario

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DOI

10.5151/1983-4764-26811

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Abstract

More and more Hot Strip Mills are facing defects on their products that lead to a rejection of complete product batches by their customers. Several of those defects are induced by excessive work roll degradation. This paper is focussed on the understanding of work roll corrosion and oxidation mechanisms in a hot strip mill. Several laboratory trials (Hot rolling simulator, cyclic oxidation) have highlighted important factors influencing corrosion of work rolls as well as helping the understandings of oxidation of a work roll in the roll bite and along the roll circumference in a stand. The attention is focussed on several elements present in water used in HSM for direct roll cooling (e.g. chloride, bactericides, sulphates, phosphates…) and their effect on roll surface degradation. The second part of this paper is focused on the understanding of work roll oxidation along the roll circumference. The effects of roll composition, roll temperature, water composition and water temperature have been studied in order to understand the oxidation/corrosion mechanisms in a HSM.

Keywords

Work roll, Degradation, Cooling water, Corrosion, Oxidation, Hot rolling

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