Continuous casting roll for casting molten baths and method for producing one such continuous casting roll

Abstract

The present invention relates to a casting roller for casting molten metal, particularly molten steel, having a roller body ( 2 ) made of a metallic material, onto which a coating ( 4 ) is applied, which is produced from a metal material having a greater hardness than the material of the roller body ( 2 ). The casting roller according to the invention has an increased service life and improved usage properties. This is achieved in that the coating ( 4 ), viewed over its thickness (D), has a lower hardness in its region bordering the roller body ( 2 ) than in the region of its free surface ( 5 ).

1 - 21 . (canceled).  
     
     
         22 . A casting roller for casting molten metal, particularly molten steel, having a roller body made of a metallic material, onto which a coating is applied, which is made of a metal material having a greater hardness than the material of the roller body, the coating, viewed over its thickness, having a lower hardness in its region bordering the roller body than in the region of its free surface, wherein the hardness of the coating increases continuously beginning with the region bordering the roller body up to its free surface.  
     
     
         23 . The casting roller according to  claim 22 , wherein the coating has a different composition in its region bordering the roller body than in the region of its free surface.  
     
     
         24 . The casting roller according to  claim 22 , wherein the coating has a softer microstructure in its region adjoining the roller body than in the region of its free surface .  
     
     
         25 . The casting roller according to  claim 22 , wherein the hardness increases linearly.  
     
     
         26 . The casting roller according to  claim 22 , wherein the increase of the hardness has a progressively increasing trend.  
     
     
         27 . The casting roller according to  claim 22 , wherein the hardness of the coating is 150 HV to 250 HV in the region bordering the roller body and is 400 HV to 500 HV in the region of the free surface.  
     
     
         28 . The casting roller according to  claim 22 , wherein the roller body is manufactured from a copper alloy, at least in its lateral surface, which is bonded to the coating.  
     
     
         29 . The casting roller according to  claim 22 , wherein the coating is formed based on a nickel alloy.  
     
     
         30 . A method of manufacturing a casting roller in which a coating made of a metallic coating material is applied to a roller body through electrolytic deposition, wherein the deposition current is increased starting from a minimum value in the course of the coating process.  
     
     
         31 . The method according to  claim 30 , wherein the depositing current is increased continuously.  
     
     
         32 . The method according to  claim 31 , wherein the increase is linear.  
     
     
         33 . The method according to  claim 31 , wherein the increase is progressive.  
     
     
         34 . The method according to  claim 30 , wherein the coating is formed based on a nickel alloy.  
     
     
         35 . A method of manufacturing a casting roller, in which a coating made of a metallic coating material is applied to a roller body through electrolytic deposition, wherein in the course of the coating process, the proportions of the elements in the electrolytes which lead to an increase of the hardness of the particular material deposited are increased.  
     
     
         36 . The method according to  claim 35 , wherein the increase of the proportions of elements which increase hardness takes place continuously.  
     
     
         37 . The method according to  claim 36 , wherein the increase takes place linearly.  
     
     
         38 . The method according to  claim 36 , wherein the increase takes place progressively.  
     
     
         39 . The method according to  claim 35 , wherein the coating is formed based on a nickel alloy.  
     
     
         40 . The method according to  claim 35 , wherein sodium citrate is added to the electrolyte as hardness-increasing element.  
     
     
         41 . The method according to  claim 35 , wherein sulfur is added to the electrolyte as hardness-increasing element.