2019 Pittsburgh AISTech

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Thermal Stains Improvements at Reversing Cold Mills (Room 307)

07 May 19
3:00 PM - 3:30 PM

Tracks: Cold Sheet Rolling

The main quality issue within a reversing cold mill has been strongly related to the emulsion carryover and the high process temperature, which are the mechanisms to create a point oxidation randomly located on the strip surface, named “thermal stains.” Galvanizing lines do not accept these stains. This paper shows how — after making significant process temperature improvements, implementing better emulsion control and pinch roll (PR) functionality changes, new PR materials and new air nozzle header design — the occurrence of stains decreased by 40% (year-over-year). Furthermore, due to the quality improvements and the new air nozzle design, the noise level decreased by 10 decibels and there was 20% less air consumption.