Sliding nozzle plate and sliding nozzle device using the same

Abstract

Disclosed is a sliding nozzle plate (composite sliding nozzle plate) ( 2 ) for use in a sliding nozzle device for adjusting an outflow amount of molten metal from a molten metal vessel. The sliding nozzle plate ( 2 ) comprises a sliding nozzle plate body and a tubular member ( 3 ) formed with a flange ( 3 a ) and attached to a bore (through-hole ( 1 c ′)) of the sliding nozzle plate body, and satisfies the following conditional formulas (1) and (2): φ B≦φI− 5  (1); and φ B−φR≦ 4  (2), where: φB is a diameter (mm) of the bore of the sliding nozzle plate body; φI is an outer diameter (mm) of the flange of the tubular member; and φR is an outer diameter (mm) of the non-flange portion of the tubular member. The composite sliding nozzle plate is capable of preventing displacement of the tubular member and molten metal penetration into a joint between the tubular member and the sliding nozzle plate body.

1 . A sliding nozzle plate usable in a sliding nozzle device for adjusting an outflow amount of molten metal from a molten metal vessel, comprising: a tubular member having a flange and defining a partial region surrounding a through-hole serving as a flow passage for molten metal; and a sliding nozzle plate body defining a remaining region, wherein the tubular member is formed separately from the sliding nozzle plate body, and attached to and integrated with the sliding nozzle plate body via a bonding material provided at least between an outer peripheral surface of a non-flange portion of the tubular member and a bore surface of the sliding nozzle plate body, and wherein the sliding nozzle plate satisfies the following conditional formulas (1) and (2):
   φ B≦φI− 5     (1)
     φ B−φR≦ 4     (2),
   where: φB is a diameter (mm) of a bore of the sliding nozzle plate body; φI is an outer diameter (mm) of the flange of the tubular member; and φR is an outer diameter (mm) of the non-flange portion of the tubular member.   
     
     
         2 . The sliding nozzle plate as defined in  claim 1 , which further satisfies the following conditional formula (3):
   φ B−φD≧ 30  (3),
   where φD is an inner diameter (mm) of the tubular member.   
     
     
         3 . The sliding nozzle plate as defined in  claim 1 , wherein the bonding material is a mortar containing metal aluminum and carbon, and wherein a part of the mortar is subjected to a contact with molten metal. 
     
     
         4 . The sliding nozzle plate as defined in  claim 1 , wherein the outer peripheral surface of the non-flange portion of the tubular member has a plurality of annular grooves formed in a multistage manner. 
     
     
         5 . The sliding nozzle plate as defined in  claim 1 , wherein the sliding nozzle plate body is a recycled sliding nozzle plate obtained by recycling a used sliding nozzle plate. 
     
     
         6 . A sliding nozzle device comprising, as a lower plate, the sliding nozzle plate as defined in  claim 1 .