Slide gate nozzle including sequentially replaceable refractory sliding plates and refractory plate assembly employable therein

摘要

A slide gate nozzle for controlling the discharge of molten metal from a spout of a converter vessel includes a refractory bottom plate to be positioned stationarily with a discharge opening thereof aligned with an opening of the spout. A refractory slide valve plate is mounted for sliding movement relative to the bottom plate such that a discharge opening of the slide valve plate is brought into and out of alignment with the discharge opening of the bottom plate. A plurality of refractory shut-off plates are positioned sealingly between the bottom plate and the slide valve plate. A coupling mechanism is operably mounted to the shut-off plates to sequentially connect the shut-off plates rigidly either to the bottom plate or to the slide valve plate. As a result, the shut-off plates may be used sequentially to replace the slide valve plate.