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The main aims of the work were to find out the relationships between the initial solidification for AISOI slabs, the possibility to control the transformation phase delta-gamma and the ferrite distribution on slab surface, and how to prevent the occurrence of surface objects such as depressions and slag entrapment, leading to slab quality improvements.

The main results of the research activities were as follows:

- The delta ferrite content was strongly dependent on the equivalent Cr/Ni ratio and cooling rate.
- Ferritescope measurements were generally lower on average compared with those by automatic image analysis.
- A new empirical equation to evaluate SDAS as a function of cooling rate was developed.
- Empirical relationships describing delta ferrite content as a function of Cr/Ni equivalents and cooling rate at different temperatures were derived.
- Large effect of reheating parameters on delta ferrite transformation at high temperatures was determined, the highest rate being observed at 1200°C.
- Higher ferrite content during primary solidification led to better slab surface quality and prevented slab conditioning.

The experimental results can be used for further mathematical modelling of ferrite transformation during continuous casting and slab reheating.

Additional information

Authors: CIPRARI I ET AL, CSM, Rome (IT);PICHT G, RWTH Aachen, Aachen (DE);SCHELLER P, KTN, Krefeld (DE)
Bibliographic Reference: EUR 20189 EN (2002), pp.109. Euro: 16.00
Availability: EUR-OP reference: KI-NA-20189-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-3203-9
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