Importance

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Abstract

A hot dip metal plating bath roll preventing flaws in a steel sheet due to a bath roll, realizing stable running at a high speed, and improving the productivity of a plated steel sheet, which hot dip metal plating bath roll having vertical grooves each formed on an outer circumferential surface of the roll and including two first curved parts projecting to the outside of the roll and at least one second curved part arranged between the two first curved part and projecting to the inside of the roll and horizontal grooves each formed on an outer circumferential surface of the roll along a barrel length direction of the roll, a pitch P₁ (mm) and depth d₁ (mm) of the vertical grooves satisfying 1.0≤P₁≤10, 0.2≤d₁≤5, and d₁≤P₁/2, a depth d₂ (mm) being 60% to 150% of the depth d₁ of the vertical grooves, and a width w₂ (mm) of the horizontal grooves being 2 times or more of the depth d₂ or 2 times or more of a radius of curvature (mm) of curved surfaces forming bottom parts of the horizontal grooves and 0.7 times or less of a pitch P₂ (mm), the pitch P₂ (mm) of the horizontal grooves being 1.0≤P₂≤10.

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First Claim