| 摘要 |
A device for introducing gas into a mass of molten metal in a vessel for creating a stirring action therein has a rammed or pressed apertured block of relatively great density and a grain structure perpendicular to the exposed working surface of the block, the apertures in the block being parallel with the grain structure and provide vertical passageways in which gas delivering tubes are positioned to communicate with the working surface of the block and the molten metal in the vessel. The formation of the block with its grain structure perpendicular to the working or exposed surface of the block greatly improves the life of the device by substantially reducing the erosion rate thereof.
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