Effect of chemical composition of mold powder on the erosion of submerged nozzles for continuous casting of steel.
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概要
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In order to elucidate the wear mechanism of ZrO2-graphite refractories used around the powder line of submerged nozzles, the authors carried out erosion tests with the variety of mold powders using an induction furnace. The mold powders with low viscosity or high [F-] content were found to wear away ZrO2-graphite refractories heavily. The erosion behavior of ZrO2-graphite refractories can well be explained by the basicity of a mold powder which consists of ion-oxygen attraction parameters of the chemical compositions in the mold powder. Observing the microstructures of the samples after test, it is clarified that the penetration of low-viscosity components in the mold powder disintegrate carbon bonding and also granulate ZrO2 grains into fine particles, consequently the erosion of ZrO2-graphite refractories is aggravated.
- The Iron and Steel Institute of Japanの論文
The Iron and Steel Institute of Japan | 論文
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