| 摘要 |
PROBLEM TO BE SOLVED: To provide a tapping port sleeve in which the tapping time at the initial stage of use is reduced and the thickness of a refractory to a using limit value can be sufficiently secured.SOLUTION: In a tapping port sleeve with an inner hole 2 communicating from an inlet edge 2A to an outlet edge 2B for exhausting molten steel from a molten steel container, only the inner hole shape of an introduction hole part 3 as the inlet side part of the inner hole 2 has a shape prescribed by specified formula.SELECTED DRAWING: Figure 1 |
