Bubbling plate for sliding nozzle

Abstract

A bubbling plate for a sliding nozzle includes a plate body defining an inner hole therein and a gas-permeable ring installed inside the plate body to define part of the inner hole. The ring has a lower end surface formed with a stepped part, a convex part or a concave part; and the plate body has an upper surface in contact with the lower end surface with the upper surface formed with a stepped part, a concave part or a convex part capable of being opposed to and fittingly engaged with a corresponding part of the ring. The area in which the part of the ring is fittingly engaged with the corresponding part of the plate body has a length of 2 mm or more along a direction of a central axis of the inner hole, and mortar is interveningly provided in at least a longitudinally-extending joint part in the fitting engagement area.

1 . A bubbling plate for a sliding nozzle used for continuous casting of steel, comprising: a plate body defining an inner hole therein; and a gas-permeable, ring-shaped component (hereinafter referred to as “ring”) installed inside the plate body to define a part of the inner hole; wherein:
 the ring has a lower end surface formed with one of a stepped part, a convex part and a concave part; and 
 the plate body has an upper surface in contact with the lower end surface of the ring, the upper surface being formed with one of a stepped part, a concave part and a convex part each capable of being opposed to and fittingly engaged with a corresponding one of the stepped part, the convex part and the concave part of the ring; and wherein: 
 an area in which one of the stepped part, the convex part and the concave part of the ring is fittingly engaged with a corresponding one of the stepped part, the concave part and the convex part of the plate body (said area will hereinafter be referred to as “fitting engagement area”) has a length of 2 mm or more along a direction of a central axis of the inner hole (said direction will hereinafter be referred to as “longitudinal direction”); and 
 mortar is interveningly provided in at least a longitudinally-extending joint part in the fitting engagement area. 
 
     
     
         2 . The bubbling plate as claimed in  claim 1 , wherein
 the stepped part of the ring is formed such that a region of the lower end surface of the ring on the side of an outer periphery of the ring protrudes downwardly with respect to a region of the lower end surface of the ring on the side of the inner hole, and   the stepped part of the plate body is formed such that a region of the upper surface of the plate body on the side of the inner hole protrudes upwardly with respect to a region of the upper surface of the plate body on the side of the outer periphery.   
     
     
         3 . The bubbling plate as claimed in  claim 1 , wherein a part or entirety of a longitudinally-extending surface in each of the stepped parts is parallel to the central axis of the inner hole. 
     
     
         4 . The bubbling plate as claimed in  claim 1 , wherein the fitting engagement area is formed between the convex part of the ring and the concave part of the plate body, wherein a part or entirety of a longitudinally-extending part of a fitting engagement surface located on the side of the inner hole in the fitting engagement area is parallel to the central axis of the inner hole. 
     
     
         5 . The bubbling plate as claimed in  claim 1 , wherein the fitting engagement area is formed between the concave part of the ring and the convex part of the plate body, wherein a part or entirety of a longitudinally-extending part of a fitting engagement surface located on the side of the outer periphery in the fitting engagement area is parallel to the central axis of the inner hole. 
     
     
         6 . The bubbling plate as claimed in  claim 1 , wherein the ring comprises a gas-permeable portion made of a porous refractory material. 
     
     
         7 . The bubbling plate as claimed in  claim 1 , wherein the ring comprises a gas-permeable portion composed of a refractory component having one or more through-holes.