Improvement apparatus of surface roughness defect of hot/cold rolled stainless steel coils and the method thereof

Abstract

Disclosed is to an improvement apparatus of surface roughness of hot/cold rolled stainless steel coils and the method thereof. The present invention provides an improvement apparatus of surface roughness of hot/cold rolled stainless steel coils including a water spray unit for spraying water on a surface of a cast stainless steel slab; a cutting unit for cutting the stainless steel slab; and a high-pressure water spray having at least one nozzle in a region where the stainless steel slab is cut by the cutting unit and discharged and installed to be symmetric in upper and lower parts of the stainless steel slab; and a roller brush installed to be in contact with and symmetric in the upper and lower parts of the stainless steel slab passed through the water spray so as to rotate at a high speed. Accordingly, the improvement apparatus according to the present invention may be useful to produce a stainless steel slab having an excellent surface quality since it is possible to easily remove the scale and mold slag from the stainless steel slab.

1 . An improvement apparatus of surface roughness defect of hot/cold rolled stainless steel, comprising:
 at least one water spray unit installed to spray water on a surface of the cast stainless steel slab along a slab supporting roll;   a cutting unit arranged in a tip of the water spray unit and cutting the stainless steel slab coagulated with the water spray unit;   a high-pressure water spray having at least one nozzle in a region where the stainless steel slab is cut by the cutting unit and discharged and installed to be symmetric in upper and lower parts of the stainless steel slab; and   a roller brush installed to be in contact with and symmetric in the upper and lower parts of the stainless steel slab passed through the water spray so as to rotate at a high speed.   
   
   
       2 . The improvement apparatus of surface roughness defect of hot/cold rolled stainless steel according to  claim 1 , wherein a flow rate of the water spray sprayed on the surface of the cut stainless steel slab ranges from 200 to 300  /min, and a water pressure in the nozzle of the water spray ranges from 100 to 200 bar. 
   
   
       3 . The improvement apparatus of surface roughness defect of hot/cold rolled stainless steel according to  claim 1 , wherein a distance from the tip of the nozzle to the surface of the cut stainless steel slab ranges from 100 to 200 mm. 
   
   
       4 . The improvement apparatus of surface roughness defect of hot/cold rolled stainless steel according to  claim 1 , further comprising a sensor for sensing a position of the cut stainless steel slab in one region in a casting opposite direction of the water spray installed in the lower part of the cut stainless steel slab and in the other region in a casting direction of the roller brush installed in the lower port of the cut stainless steel slab. 
   
   
       5 . An improvement method of surface roughness defect of hot/cold rolled stainless steel, comprising steps;
 spraying water on a surface of a cast stainless steel slab;   cutting the water-sprayed stainless steel slab; and   removing foreign substance from a surface of the cut stainless steel slab using a high-pressure water spray and a roller brush.   
   
   
       6 . The improvement method of surface roughness defect of hot/cold rolled stainless steel according to  claim 5 , wherein a flow rate of the high-pressure water spray sprayed on the surface of the cut stainless steel slab ranges from 200 to 300  /min, and a water pressure in the nozzle of the water spray ranges from 100 to 200 bar. 
   
   
       7 . The improvement method of surface roughness defect of hot/cold rolled stainless steel according to  claim 6 , wherein a distance from the tip of the nozzle to the surface of the cut stainless steel slab ranges from 100 to 200 mm. 
   
   
       8 . The improvement method of surface roughness defect of hot/cold rolled stainless steel according to  claim 5 , wherein the step of removing foreign substance from a surface of the cut stainless steel slab using a high-pressure water spray and a roller brush further comprises a step of including a sensor for sensing a position of the cut stainless steel slab. 
   
   
       9 . The improvement method of surface roughness defect of hot/cold rolled stainless steel according to  claim 5 , after the step of removing foreign substance from a surface of the cut stainless steel slab using a high-pressure water spray and a roller brush, further comprising a step of charging the cut stainless steel slab into a heating furnace and hot-rolling the cut stainless steel slab.