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Final report on Contract No 7210-PR/013; 1 July 1997 to 31 December 2000.

Gas injections in SEN may lead to in-mould perturbations. It is necessary to promote bubbly flow in the nozzle. A multiple-hole stopper controlling the gas injection decreased mould level fluctuations.

An anti-clogging material proved to have no effect on clogging at low argon flow rate. The development of a porous stopper tip was cancelled. The argon flow rate was limited to a maximum of 3 l/min on the water model and on plant leading to clogging. Moreover, a fear of blister formation came from smaller bubbles, which are entrapped more deeply in the CC machine compared to the standard stopper.

High throughput casting is harmful as gas bubbles are deeply entrapped in the CC machine. A critical metal throughput was defined over which bubbles are entrapped in the CC machine out of the mould corresponding to a blister risk. The gas quantity is exponentially increasing with the metal throughput at the mould exit. An enlarged SEN bore diameter corresponds to higher critical metal throughput. A multiple-port nozzle, improving degassing in the mould, was proposed after water modelling. No blister was found after casting on a vertical bending machine at 5 t/min with standard gas injection and a large diameter SEN.

No clear result is available concerning a possible effect on the blister index of the IF steel grade. grade.

Additional information

Authors: BURTY M, IRSID, Maizières-les Metz (FR);GESELL M, Thyssen Krupp Stahl, Duisburg (DE);DE SANTIS M, CSM, Rome (IT)
Bibliographic Reference: EUR 20193 EN (2002), pp.82. Euro: 13.00
Availability: EUR-OP reference: KI-NA-20193-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-3200-4
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