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Final report on Contract No 7210-PR/016, 1 July 1997 to 31 December 2001.

The general objective of the project has been to minimise the centre segregation, especially during transient casting conditions, and to develop an innovative soft reduction concept for blooms. The solidification model Tempsimu was calibrated by MEFOS with the wedge technique and the zero-strength-temperature (ZST) isotherm correlated well with the results.

During testing of a soft reduction unit, the best results were found with 4mm total reduction at a strand thickness of 220mm. The actual strand thickness was measured at one point and the reduction was performed at three reduction points over lengths of 2.1mm. 3D mathematical modelling of the INEXA caster was carried out during transient casting conditions. It was found that the shape of the crater was changed, as well as the speed of the movement of the crater.

Liquid melt could also be encapsulated locally during transient conditions. An extra cooling zone would smooth out the crater end profile. The secondary-cooling model Dyncool 6 was further developed to improve the calculation of the crater end position during transient conditions. Dynamic wedge tests were performed both at increased and decreased casting speeds. The results from the increased and decreased shell thickness measurements during transient casting fitted well with the root law relationship. Slab quality improved after dynamic soft reduction, but observed plate quality did not change.

Additional information

Authors: NYSTROM R, MEFOS, Lule? (SV);SPITZER K-H, TUC, Clausthal-Zellerfeld (DE);MAGNUSSON M, INEXA Profil AB, Luleå (SV);HAAPALA M, Rautaruukki, Raahe (FI);NILSSON A, MEFOS, Luleå (SV);WHITE J, MEFOS, Luleå (SV);NYSTRÔM R, MEFOS, Luleå (SV)
Bibliographic Reference: EUR 20499 EN (2002), pp.88. Euro: 13.00
Availability: EUR-OP reference: KI-NA-20499-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-4385-5
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