To provide a stopper for an automatic pouring furnace and a nozzle for the automatic pouring furnace which have prolonged life and are stably operated.
A refractory layer 4 in the stopper head 3 of the stopper 1 does not become an oxygen supply source to molten metal since slaking-decomposition of agalmatolite grains does not occur even when coexisting with graphite or carbon. Further, a glassy film is formed on the operating surface of the stopper in contact with the molten metal to flatten the operating surface structure, and the entrapping of the air through the refractory can be restrained, and the refractory layer has excellent heat resistance, high erosion resistance and oxidizing resistance and little wettability with the molten metal. Consequently, as for the automatic pouring furnace 21, the optimum stopper 1 can be provided and further a refractory layer 15 forming the inner peripheral surface 14 of the nozzle 12 opened/closed with the stopper 1 shows the same action as the above refractory layer 4, and has excellent high strength and high erosion resistance and little wettability with the molten metal, and therefore the optimum nozzle 11 can be provided as for the automatic pouring furnace 21.
KASUGAI SADANORI
MUROI TOSHIYUKI
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