JCO JCO METHOD FOR MANUFACTURING STEEL SHEET FOR MAKING JOC STEEL PIPE AND JOC STEEL PIPE

摘要

A method of manufacturing a JCO plating plate and a JCO steel pipe is disclosed. One aspect of the present invention is a method for cooling a heated plate to produce a plate for JCO conditioning, the cooling being performed such that the quench zone and the slow cooling zone alternate in the width direction of the plate during cooling, And the slow cooling region are parallel to each other in the longitudinal direction of the plate material.