The leakage of blast furnace tuyeres is an unpredictable incident, which happens several times at normal blast furnace operation. The reasons for BF tuyere damages were investigated and the liquid slag and hot metal were found as the main causes of the tuyere burn-out. Investigation was initiated in order to describe the accurate wear mechanism of tuyere erosion due to hot metal and slag. Metallographic tests were performed by analytically analyzing the removed noses of damaged tuyeres. Analyses showed Cu-Fe solid solution formation between tuyere material and the Fe-content of hot metal droplets. A thermodynamic model was prepared for the analysis of the thermal relations between the tuyere and the hot metal drop causing its damage; based on which, it can be stated that the conditions of the formation of Cu-Fe solid solution are given under the blast furnace circumstances.
ISD DUNAFERR Co. Ltd., formerly named as Dunai Vasmű (Danube Ironworks), has a history of over half a century. Currently it is the only factory in Hungary that is operated by integrated steel-making technology and has a hot metal production capacity of 1.7 million tons (Figure 1). The metallurgical combine includes coke production, hot metal production, steel-making, hot and cold rolling, profiling and manufacturing of galvanized products too. Steel is produced by 2 BOFs with the capacity of 135 tons each.
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