Evaluation of the rolls wear of the finished group at the rolling mill CWRM-1700 by the JSC “ArselorMittal Temirtau”

The decrease of the rolls wear is an important reserve of the improvement of rolling production. At present during rolling metal of all kinds at the wide-strip rolling mill CWRM-1700 by the JSC “ArselorMittal Temirtau” work rolls of the Hi-Cr type are used in stands No. 6-8, whereas work rolls of the ICDP type are used in stands No. 9-12 for finish rolling. Initial and worn profiles of rolls were determined using the instrument ID 05009. Measurements were performed after roll reloading and cooling, mainly before polishing, with the accuracy of ± 0.01 mm. The amount, assortment and steel grades of the rolled metal, as well as diameters, chemical composition and hardness of the rolls were also fixed. In general research permitted to estimate the wear of the work rolls of the finishing group of CWRM-1700 using geometrical, kinematic and energy indicators of wear. The energy indicator is universal since it takes into account the decrease of the body size from unit work of friction forces on unit roll surface. The kinematic indicator takes into account the decrease of the roll radius relative to unit friction path of the roll surface. The change of geometrical wear indicators of rolls with the same properties in different stands makes it necessary to take account of technological factors that were taken into account while calculating kinematic and energy indicators.