METHOD FOR MANUFACTURING PLATED STEEL PIPE

PROBLEM TO BE SOLVED: To provide a manufacturing method of a high-quality metallic welded pipe by restraining the deformation in a weld zone and in the vicinity of the weld zone by the minimum roll changing when manufacturing a high frequency welded steel pipe by taking a plated steel sheet as a base stock. SOLUTION: This plated steel pipe is manufactured, after forming the plated steel sheet into an open pipe-shape, by using a roll having a curvature in a range of 1.05-1.2 times the average curvature of the outside of a pipe after welding in the profile of the peripheral surface of the roll in the vicinity of a fin as a roll of at least the first stage of a fin pass roll group having a fin to which both end parts in the width direction are abutted and a seam guide roll group, feeding the open-pipe-shaped steel sheet to which overbending for bending excessively than the curvature of a product is once imparted in both end parts in the width direction between squeezing rolls and performing welding after abutting both end parts in the width direction. COPYRIGHT: (C)2004,JPO&NCIPI