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The project objective was achievement of blowhole reduction by optimization of the feeding system design, resulting in:

- optimized fluid flow
- reduced argon injection

To counteract potential clogging increase, new refractories were tested.

Advanced fluid flow modelling, using 3D CFD and physical models, showed that stable flow does not exist even in stationary conditions. The presence of some kind of chaos requires a feeding system designed for maximum fluid flow stability. It was concluded that swirling flow offers a good possibility for mould flow stabilization and prevention of depositions in the feeding system.

The role of argon solubility has been clarified and measurements showed values below 1 ppb. Argon distribution measurements over the mould proved not to be feasible. Application of an argon supply control system and a tight stopper rod showed good results. Unfortunately, air ingress could only be prevented for 10 minutes. Additionally, alternative jargon injections points in the tundish/stopper region were studied. Furthermore, blowhole reduction was achieved by non-argon casting but resulted in an increased amount of sliver defects. defects.

Additional information

Authors: KAMPERMAN A A, Hoogovens Research and Development, Ijmuiden (NL);THIEMANN TH, Betriebsforschungsinstitut des VDEH, D³sseldorf (DE);SMITH S, British Steel Teeside Technology Centre, Middlesborough (GB);NAVEAU P, Centre de recherches mÚtallurgiques, Liþge (FR);SJÍSTRÍM U, MEFOS, Lulea (SE);SJISTRIM U, MEFOS, Lulea (SE)
Bibliographic Reference: EUR 19373 EN (2000) 233 pp., EUR 35.50
Availability: Available from EUR-OP Sales Agents
ISBN: ISBN 92-828-9471-1
Record Number: 200012182 / Last updated on: 2000-07-12
Original language: en
Available languages: en
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