| 摘要 |
<p>A refractory pouring member (20) such as a tundish nozzle or tube (24) and integral plate (22) for use in a slide gate valve or stopper rod valve system in continuous steel casting has selected portions made from an erosion and abrasion resistant refractory composition. The composition comprises: up to 95 wt.% Al2O3; up to 15 wt.% C; up to 10 wt.% SiO2; and up to 3 wt.% antioxidant. At least an upper surface (28) of the slide plate (22) is formed from the erosion and abrasion resistant refractory composition to prevent in-service wear of the slide plate and a selected portion (40, 40') of the tube bore (26) is formed of the erosion and abrasion resistant material, preferably extending a distance of about 50 to 300 mm from the top of the slide plate to protect the tube bore from the erosive action within a turbulent flow zone of molten metal which exists when the slide gate valve is in a throttling mode of operation. Pouring members having selected portions made from the erosion and abrasion resistant refractory material are particularly suited for use with tube changers for slide gate valves and for use in stopper rod systems used in the continuous casting of steel.</p> |
