The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 1999
Filed:
Mar. 20, 1997
Roger W Brook, Argyll, GB;
Quentin K Robinson, Pittsburgh, PA (US);
Vesuvius Crucible Company, Wilmington, DE (US);
Abstract
A refractory pouring member such as a tundish nozzle or tube and integral plate 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. % Al.sub.2 O.sub.3 ; up to 15 wt. % C; up to 10 wt. % SiO.sub.2 ; and up to 3 wt. % antioxidant. At least an upper surface of the slide plate is formed from the erosion and abrasion resistant refractory composition to prevent in-service wear of the slide plate and a selected portion of the tube bore 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.