Method of producing steel material, apparatus that cools steel material, and steel material

Abstract

A method of producing a steel material, wherein when a cooling apparatus having a plurality of cooling sections disposed side by side in a longitudinal direction of a steel material cools the steel material hot worked or cooled/reheated, the steel material is conveyed at a conveyance distance L o (m) satisfying Equation (1), in one direction along with the longitudinal direction of the steel material, in the cooling apparatus, wherein L o is defined as conveyance distance (m) of steel material, m is a natural number, and L h is defined as length (m) of cooling sections in longitudinal direction of steel material: ( m− 0.20)× L h ≤L o ≤( m +0.20)× L h   (1).

1 - 5 . (canceled) 
     
     
         6 . A method of producing a steel material, wherein
 when a cooling apparatus having a plurality of cooling sections disposed side by side in a longitudinal direction of a steel material cools the steel material hot worked or cooled/reheated,   the steel material is conveyed at a conveyance distance L o  (m) satisfying Equation (1), in one direction along with the longitudinal direction of the steel material, in the cooling apparatus, wherein L o  is defined as conveyance distance (m) of steel material, m is a natural number, and L h  is defined as length (m) of cooling sections in longitudinal direction of steel material:
   ( m− 0.20)× L   h   ≤L   o ≤( m+ 0.20)× L   h   (1).
 
   
     
     
         7 . The method according to  claim 6 , wherein, in conveyance of the steel material, the steel material is conveyed while being oscillated in both directions of one direction and other direction along with the longitudinal direction of the steel material, and the amplitude of the oscillation is set to the conveyance distance L o  satisfying Equation (1). 
     
     
         8 . The method according to  claim 6 , wherein the steel material is a rail material. 
     
     
         9 . An apparatus that cools hot worked or cooled/reheated steel material comprising:
 a plurality of cooling sections disposed side by side in a longitudinal direction of the steel material; and   a conveyance section configured to convey the steel material at a conveyance distance L o  (m) satisfying Equation (1), in one direction along the longitudinal direction of the steel material in the cooling apparatus, during cooling of the steel material in the cooling sections, wherein L o  is defined as conveyance distance (m) of steel material, m is a natural number, and L h  is defined as length (m) of cooling sections in longitudinal direction of steel material:
   ( m− 0.20)× L   h   ≤L   o ≤( m+ 0.20)× L   h   (1)
 
   
     
     
         10 . A steel material produced by hot working or cooling/reheating and thereafter cooling in a cooling apparatus having a plurality of cooling sections disposed side by side in a longitudinal direction, wherein,
 during cooling in the cooling apparatus,   the steel material is produced while being conveyed at a conveyance distance L o  (m) satisfying Equation (1), in one direction along with the longitudinal direction of the steel material in the cooling apparatus, wherein L o  is defined as conveyance distance (m) of steel material, m is a natural number, and L h  is defined as length (m) of cooling sections in longitudinal direction of steel material:
   ( m− 0.20)× L   h   ≤L   o ≤( m+ 0.20)× L   h   (1).
 
   
     
     
         11 . The method for producing a steel material according to  claim 7 , wherein the steel material is a rail material.