Sliding nozzle plate

摘要

The present invention provides an SN plate capable of being formed in a large size while using a highly corrosion resistant and highly thermally expansible refractory product. In the SN plate of the present invention, a specific refractory member 1a having a thermal expansion rate as measured at 1500° C. of 1.15 to 2.50% due to addition of aluminum for improving corrosion resistance is arranged as a part of the SN plate to cover at least a practically critical region of the SN plate. A thickness of the specific refractory member is set in a range of 15 to 25 mm. A portion of the SN plate other than the specific refractory member is made up of an unburned or burned refractory product consisting primarily of an alumina-carbon composite.

主权项

1. A two-portion sliding nozzle (SN) plate for use in a sliding nozzle device comprising:
a refractory insert portion, the refractory insert portion having a maximum thermal expansion measured at 1500° C. of 1.15 to 2.50% due to addition of metallic aluminum and a thickness in a range of 15 to 25 mm; a refractory base portion, wherein the refractory insert portion is fitted over a sliding surface of the refractory base portion to cover a region of the sliding surface of the sliding nozzle plate most required to have corrosion resistance as compared to other regions of the sliding surface of the sliding nozzle plate; and a nozzle hole for allowing molten metal to pass therethough, the nozzle hole having a diameter of greater than 50 mm.