A special, hollow, refractory shape used at the base of the guide tubes in the bottom pouring of molten steel. The center brick has a hole in its upper face, and this is connected via the hollow center of the brick to holes in the faces (often six in number). The center brick distributes molten steel from the trumpet assembly to the lines of runner bricks. It is also sometimes known as a crown brick or spider. Dodd
Source:
Dictionary of Mining, Mineral, and Related Terms












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