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Title

IN-SITU INVESTIGATION OF THE EFFECT OF HARD CHROME PLATING ON IRON FINES FORMATION

Authorship

Mekicha, M. A.; Rooij, M. B. de; Matthews, D. T. A.; Pelletier, C.; Schipper, D. J.

Mekicha, M. A.

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Rooij, M. B. de

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Matthews, D. T. A.

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Pelletier, C.

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Schipper, D. J.

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DOI

10.5151/9785-9785-32216

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Abstract

One of the main factors that reduce strip cleanliness are iron fines, which are formed due to the abrasive interactions of the roll surface and the strip in the roll bite during cold rolling. They can cause a problem in fouling of the cold rolling mill as well as downstream processes. It has been repeatedly observed that chrome plating the work roll improves strip cleanliness. In the present work, scratch tests and reciprocating sliding tests were carried out under lubricated conditions to explore the influence of chrome plating on iron fines formation. Scratch tests were conducted to study the influence of chrome plating on iron fines formation at single asperity scale due to its intrinsic property. Reciprocating sliding tests were performed to study the influence of chrome plating a rough surface on iron fines formation, taking into account the initial roughness. The scratches made using chrome plated pins showed lower friction, generated less iron fines and exhibited lower material transfer. Reciprocating sliding tests done using the uncoated pins showed galling at different sliding distances depending on the roughness of the pin. On the contrary, reciprocating sliding tests with the chrome plated pins exhibited no galling irrespective of the roughness.

Keywords

Chrome plating; Scratch tests; Iron fines; Cold rolling.