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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 26
SUMMARY:Strong step forward in the understanding of back-up rolls degradation in various cold and temper rolling mills
DESCRIPTION:Back-up rolls (BURs) in cold and temper rolling mills often exhibit very inhomogeneous wear rates over their barrel length. Wear rates and resulting BUR wear profiles are usually not understood and (thus) not well predicted. The BUR wear profile has, in turn, a large effect on the local work roll/back-up roll (WR/BUR) contact stress distribution along the BUR barrel length. This crucial parameter for rolling contact fatigue is also unknown as well as also highly inhomogeneous. Consequently, also the onset of local rolling contact fatigue (RCF) at the BUR surface is poorly predicted and may in fact differ strongly between consecutive mill campaigns of the same BUR, so that mills struggle to define adequate (= safe and economical) practical maximum BUR campaign length limits. 

An assessment of BUR wear and rolling contact fatigue phenomena by examination of worn BUR surfaces in association with rolling mill process data and profiles has enabled to determine the degradation mechanism of various rolls in different kinds of cold rolling and temper mills, stand positions and materials. This analysis, based on light optical microscopy, hardness, roughness and profile measurements was performed on-site at Tata Steel in IJmuiden. 

Further analysis of BUR wear and contact fatigue damage accumulation in the sub-surface region was enabled by microscopic analysis in cross section of samples extracted from two scrapped BURs, an ICDP BUR and a 3%Cr forged steel BUR. This paper will give an overview of back-up rolls degradation, surface aspects, mechanisms and important differences of selected cold and temper rolling mills. 
CLASS:PUBLIC
DTSTART:20230615T092000
DTEND:20230615T094000
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