Method and system for manufacturing metal-plated steel pipe

摘要

Disclosed are a system capable of adjusting a dipping time easily in a continuous steel pipe manufacturing line, and a manufacturing method.  The steel pipe manufacturing system manufactures a steel pipe which has been plated on the inner and outer faces or one face thereof with a molten metal, from a strip steel by the continuous manufacturing line.  The steel pipe manufacturing system comprises an inner-face plating section for subjecting the upper side of the strip steel on the side, which is equivalent to the inner face of the steel pipe, to the molten-metal plating treatment by pouring the molten metal, a steel-pipe forming section for cold-forming the inner-face-plated strip steel continuously into a tubular shape and seam-welding the joined longitudinal end faces of the strip steel formed into the steel pipe, to thereby acquire a continuous steel pipe, and an outer-face plating section for plating the steel-pipe outer face with the molten metal by dipping same in the molten metal.  The steel pipe manufacturing system is characterized in that the molten-metal dipping length in the inner-face plated section and/or the outer-face plated section can be adjusted.