The state of the art in the technology, properties, and uses of submersible quartz and corundum-graphite nozzles for continuum steel casting is considered. Corundum-graphite nozzles display a low heat resistance, increased air permeability and, moreover, are environmentally hazardous. The existing methods for updating corundum-graphite nozzles fail to settle the question of channel clogging in casting rimmed steel and other types of steel. Quartz nozzles fabricated by conventional technologies are devoid of these shortcomings; however, they have a shorter life because of the chemical interaction of alloying steel components and their oxides with SiO2. Comparative tests on submersible quartz nozzles differing in structure and chemical and phase composition showed the emerging potential for new technologies and approaches in the production and uses of updated quartz glass-based nozzles for casting common and low-alloy steels. For casting common steels, updated submersible quartz nozzles are developed with a warranty endurance, under slab CCM operating conditions, of 720 tons (in terms of steel cast) against the rated life of 1200 tons. For low-alloy steels, modified submersible quartz nozzles are recommended with a warranty endurance of 360 tons (in terms of steel cast) against the rated life of 540 tons.
Refractories and Industrial Ceramics – Springer Journals
Published: Oct 9, 2004
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