Composite spray gun for vacuum air-removing tank and its using method

Application Number: 00108934
Application Date: 2000.05.22
Publication Number: 1274759
Publication Date: 2000.11.29
Priority Information: 1999/5/21 JP 141812/99
International: C21C7/10;C21C7/068;C21C5/32;C21C5/46
Applicant(s) Name: Kawasaki Steel Corp.
Inventor(s) Name: Orito Kemichi;Kuriwaki Takasei;Takata Masaaki
Patent Agency Code: 72001
Patent Agent: zhang tianan
Abstract A multi-function lance for insertion into a vacuum degassing chamber, includes a top-blown oxygen lance provided as a path for gaseous oxygen. A nozzle is provided at a downstream end of the oxygen path used for blowing oxygen onto a molten metal. A water-cooled jacket surrounds the outer periphery of the top-blown oxygen lance. At least a set of paths for a fluid fuel and a gas for burning the fuel is positioned in a multi-function lance, namely in the water-cooled jacket, and a combustion burner is provided at a downstream end of the path. By using the multi-function lance according to the present invention, not only a safer and shorter preheating operation is enabled, but also oxygen lancing, temperature elevation of molten steel, and heating of the vacuum degassing apparatus itself are smoothly realized.