Kurosaki Refractories Co., Ltd.

Hiroshi Shikano

Toshihiro Suruga

Tsutomu Harada

Ichiro Takita

Toshiaki Kaneko

2 to 15 wt % of a resin is added to a mixture of a refractory aggregate and a metal having a melting point of not higher than 1,000.degree. C., the resin being obtained by added 10 to 90 wt % of a silicon resin to at least one kind of thermosetting resin which easily exhibits a higher mechanical strength when heated to about 150.degree. to 250.degree. C. The resultant mixture is molded and heated to a temperature of not higher than 1,000.degree. C., thereby producing a high-durability plate brick for a sliding gate nozzle apparatus.

High-durability plate brick for sliding gate nozzle apparatus

Erosion or corrosion that has been caused during pouring a molten steel through a sliding gate nozzle for continuous casting becomes very serious when a specially treated molten steel such as deoxidized steel with a Ca alloy is applied for continuous casting. Such erosion can be eliminated by partially arranging a zirconia base refractory material on a portion of the inner surface of the nozzle hole. The zirconia base refractory material is composed of more than 53% by weight of partially stabilized zirconia base refractory material having less than 10 mesh grain size, 1 to 7% by weight of metallic silicon powder having less than 100 mesh grain size and 3 to 10% by weight of carbon powder.

Sliding gate nozzle for special steel

Alumina-carbon-based refractory plates for the sliding nozzle are produced from alumina powder and carbon powder of specific particle diameter, in addition to the conventional refractory materials. The plates are durable and have good resistance to molten steel because of a compact structure which prevents the sticking of molten steel.

Process for producing refractory plate for sliding nozzle

Thin, flaky graphite-containing refractories are obtained by refining and processing naturally occurring minerals and possess a specific size of the extent of the surface of a flaky layer and a specific thickness of a flake. Such flaky graphite-containing refractories exhibit high endurance and are effective as lining materials particularly for steel making furnaces.

Growing community of inventors

Kitakyushu, Japan

Hiroshi Shikano