Casting Mould for Casting Steel Melt

Abstract

A casting mould for casting steel melt into a continuously drawn strand is provided herein. A surface texture is formed on at least one inner surface of the casting mould facing towards the melt to be cast. The surface texture extends at least over region of the casting mould which, during operation, is wetted with slag floating on the melt that has been poured into the casting mould. The casting mould allows optimum solidification behaviour in the region of the casting mould that is critical in terms of the risk of crack formation. The surface texture is designed as a closed structure with self-contained, randomly distributed indentations.

1 . A casting mould for casting steel melt into a continuously drawn strand wherein a surface texture is formed on at least one inner surfaces of the casting mould facing towards the melt to be cast, said surface texture extending at least over a region of the casting mould, which, during operation, is wetted with slag floating on the melt that has been poured into the casting mould, wherein the surface texture is designed as a closed structure with completely bordered, randomly distributed indentations. 
     
     
         2 .The casting mould according to  claim 1 , wherein the surface texture extends over an area, which, measured in a casting direction, begins at a distance of at least 10 mm below an upper edge of the mould and ends at a maximum distance of 600 mm. 
     
     
         3 . The casting mould according to  claim 1 , wherein a maximum depth of indentations of the surface texture is 500 μm. 
     
     
         4 . The casting mould according to  claim 1 , wherein a mean roughness index of the surface texture is between 10 μm and 50 μm. 
     
     
         5 . The casting mould according to  claim 1 , wherein a mean roughness depth of the surface texture is between 80 μm and 250 μm. 
     
     
         6 . The casting mould according to  claim 1 , wherein the casting mould has a square or rounded opening cross-section and wherein the surface texture is configured on at least one of the inner surfaces of the casting mould, which defines the opening cross-section on a long side thereof. 
     
     
         7 . The casting mould according to  claim 6 , wherein the casting mould is width-adjustable by moving a short side thereof and wherein the surface texture extends over a width of the inner surface provided with said surface texture, by means of which the inner surface comes into contact with the melt to be cast, if the casting mould is set to the smallest width. 
     
     
         8 . The casting mould according to  claim 1 , wherein the surface texture is introduced by impacting the respective inner surface of the casting mould. 
     
     
         9 . The casting mould according to  claim 8 , wherein the surface texture is introduced into the inner surface using needles. 
     
     
         10 . The casting mould according to  claim 8 , wherein the surface texture is embossed into the respective inner surface of the casting mould. 
     
     
         11 . The casting mould according to  claim 1 , wherein the inner surface provided with the surface texture is covered with a layer of nickel over a section beginning at a distance from an upper edge of the mould and wherein the surface texture overlaps an edge region of the nickel layer assigned to the upper edge of the mould. 
     
     
         12 . The casting mould according to  claim 11 , wherein the surface texture overlaps the nickel layer measured in a casting direction by at least 50 mm.