The tap hole of converter is the unique channel from the Bof to the ladle, it is crucial for the steel plants to improve the working ratio, increase the output within the unit time; while the working condition of the taphole is extreme harsh: 1.It is impacted by steel water under 1500-1700 degrees again and again; 2. It is oxidized, washed and eroded frequently; 3.It is easy destroy because of the quick cooling in treat. Under the severe working environment, the inside diameter of tap hole is expanded more and more, tapping time decrease with the usage frequency’s increasing, tapping time is shorter than stimulate ones, then slag entrapment will become the inevitable phenomenon, this will effect the output heavily. At this situation we have to change the tap. The service life of tap hole will effect the Metallurgical cycle, steel productivity, effect of slag of the converter, and then the quality of the steel directly. T
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