APPARATUS FOR MANUFACTURING STEEL PIPE, AND MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To manufacture a steel pipe having a surface plated so as to acquire further improved corrosion resistance. SOLUTION: The apparatus for manufacturing the steel pipe comprises: a pipe production unit for producing a steel pipe from a steel plate; a heat treatment unit which is coupled with the pipe production unit to form a single line and heats the steel pipe at a high temperature for heat treatment; a pretreatment unit for providing a reductive atmosphere and annealing the steel pipe while slowly cooling it; a pot which stores a molten SeAHLume alloy containing aluminum and zinc; a level block selectively inserted into the molten alloy in order to adjust a level of the molten alloy; and a plating unit including a plating section placed so that the molten alloy can be passed into the plating section when the level block is inserted, and so that the steel pipe substantially perpendicularly can penetrate the plating section. COPYRIGHT: (C)2007,JPO&INPIT