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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 26
SUMMARY:Development of a new high speed steel (HSS) roll for heavy-duty plate mill applications
DESCRIPTION:A new High Speed Steel (HSS) concept for heavy-duty cast roll materials has been developed. Target was to develop a suitable casting and alloying concept to yield an optimized structure of the HSS material, but still using established production processes. More specifically, the current alloying concept needed to be modified so that unwanted phase transformation of softer phases, ferrite and pearlite, should be pushed to longer times, in order to reach the harder phases martensite and bainite upon cooling after austenitization.
With guidance from computational thermodynamics different alloying concepts were studied by simulating continuous cooling diagrams (CCT), with interest on critical cooling rates and with respect to the available process window. To validate and confirm these alloying ideas, small scale laboratory ingots were produced, and industrial heat-treatments were simulated by dilatometry. From dilatation experiments and characterization, it was confirmed that the optimized alloying was able to push unwanted phase transformations to longer times, which resulted in improved mechanical properties. Different tempering trials were studied by varying double and triple cycles. Different tempering temperatures was then decided and evaluated by both hardness and impact testing.
Based on small-scale laboratory work and the confirmation of alloying ideas, together with a suitable casting and modified heating concept, a full-scale Plate Mill Work Roll has been produced. This new HSS roll concept is now running in a hot plate mill, results are here presented.

CLASS:PUBLIC
DTSTART:20230615T094000
DTEND:20230615T100000
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