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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 26
SUMMARY:On the performance and surface quality of graphitic HSS roll grades at Tata Steel's Direct Sheet Plant
DESCRIPTION:Graphitic HSS roll grades such as ESW’s brand VANIMO can be considered as the latest developments for the last finishing stands in hot strip mills. These roll grades are developed on the basis of the alloying concept of (Carbide Enhanced) Indefinite Chill work roll materials. During the development of VANIMO, the amounts and types of carbide-forming elements were increased and adjusted in the direction of cast HSS roll grades. The microstructure of graphitic HSS roll grades, therefore, consists of tempered martensite, cementite, and several different carbide types as well as a well-defined amount of free graphite.
The main purpose of graphitic HSS roll grades is the combination of the high surface quality of Indefinite Chill alloys as well as the high wear resistance of HSS roll grades. The development and introduction of this very advanced roll grade at Tata Steel’s Direct Sheet Plant in The Netherlands were done in close cooperation between the customer and the roll supplier. Several systematic steps were taken to increase the wear performance from Carbide-Enhanced Indefinite Chill grades to the more advanced grades to reach the highest alloyed roll grade VANIMO. In every development step, the surface quality of the roll grades was carefully monitored.
This paper describes the improvement of the wear performance for roll grades in the last finishing stands in the Direct sheet plant by introducing higher alloyed roll grades, up to VANIMO. Different appearances of the strip surfaces in relation to the work roll material are presented and the root causes for these phenomena are explained. Finally, some possible strategies to improve the surface quality of graphitic HSS roll grades are presented.

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DTSTART:20230615T090000
DTEND:20230615T092000
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