Apparatus for manufacturing molten metal coated steel strip and method for manufacturing molten metal coated steel strip

Abstract

An apparatus for manufacturing a molten metal coated steel strip configured to control the amount of a metal coated on surfaces of a steel strip by blowing a gas from gas wiping nozzles to the surfaces of the steel strip continuously drawn from a molten metal, includes molten-metal-reducing members arranged on both sides of the steel strip below the surface of the molten metal in the coating bath to face the steel strip, each of the molten-metal-reducing members having a length equal to or longer than the steel-strip width, and shields arranged between the molten-metal-reducing members each extending along an extension of a corresponding one of the surfaces of the steel strip.

1 . An apparatus for manufacturing a molten metal coated steel strip configured to control the amount of metal coated on surfaces of a steel strip by blowing a gas from gas wiping nozzles to the surfaces of the steel strip continuously drawn from a molten metal comprising;
 molten-metal-reducing members arranged on both sides of the steel strip below the surface of the molten metal in the coating bath to face the steel strip, each of the molten-metal-reducing members having a length equal to or longer than the width of the steel strip, and   shields arranged between the molten-metal-reducing members and extending along an extension of a corresponding one of the surfaces of the steel strip.   
     
     
         2 . The apparatus according to  claim 1 , wherein the length of a surface of each of the shields facing the steel strip in the travel direction of the steel strip is 50% or more of the length of a steel-strip-facing surface of each of the molten-metal-reducing members in the travel direction of the steel strip (when the steel-strip-facing surfaces of the molten-metal-reducing members in the travel direction of the steel strip have different lengths on both sides of the steel strip, the length of the surface of each of the shields facing the steel strip in the travel direction of the steel strip is 50% or more of the length of the steel-strip-facing surface of the molten-metal-reducing member having a shorter length of the steel-strip-facing surface in the travel direction of the steel strip), and wherein the distance between the molten-metal-reducing members and the shields is 3 mm or less. 
     
     
         3 . A method for manufacturing a molten metal coated steel strip comprising coating a steel strip with a molten metal with the apparatus according to  claim 1 . 
     
     
         4 . A method for manufacturing a molten metal coated steel strip comprising coating a steel strip with a molten metal with the apparatus according to  claim 2 .