Cooling box for metallurgical furnace

A cooling box of depressed shape having a front end part (A) for a metallurgical furnace having a plurality of partition walls, a plurality of cooling water channels being defined therein said cooling box comprising a tail flange, a first side plate having an inner side, a first cooling water channel (6), being provided along the inner side of said side plate (9), formed itself into a loop in the front end part (A) of said cooling box and turning back to said tail flange (1), said first cooling channel starting from said tail flange, a second cooling water channel (7), provided along the inner side of said first cooling water channel (6), starting from said tail flange (1), forming itself into a loop at a position near said front end part (A) of said cooling box and turning back to said tail flange (1), and a third cooling water channel (8), provided along the inner side of said second cooling water channel (7), having one end thereof communicating with one end of said second cooling water channel (7), passing around the forward end of one of said partition walls (5) and turning back to said tail flange (1), the width of said first cooling water channel along the front end part of said cooling box being narrowed, whereby cooling water flows smoothly and at high speeds in said cooling channels.