| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bath roll for use in hot-dip metal coating line, especially hot-dip zinc coating line, that even in use over a prolonged period of time, is free from dross sticking to the roll surface and hence is capable of maintaining the quality of steel sheet. <P>SOLUTION: The bath roll for hot-dip metal coating has continuous asperity provided in the circumferential direction of the surface of roll base material, and is characterized in that the asperity has a pitch P of 1 to 10 mm, a depth to bottom portion t of 0.2 to 5 mm being a half of the pitch P or less and, in cross-sectional view, a curvature radius of apical portion R of 0.1 mm or greater and a curvature radius of bottom portion R' satisfying the formula: 1.5R≤R'≤P<SP>2</SP>/(8t)-R+t/2(a) and that the angle θ made by mutually adjacent straight lines linking the curve point of the apical portion with the curve point of the bottom portion is 90° or greater. <P>COPYRIGHT: (C)2009,JPO&INPIT |
