Straight Seam Submerged Arc Welding Pipe: JCOE Steel Pipe forming material."J-C-O-E" Pre-Welding, Forming, Cold Expanding after Welding and other processes.Using a single medium thick plate as raw material, the steel plate is pressed (rolled) into a blank in the mold or forming machine, and the pipe is formed by double-sided submerged arc welding and expanding. JCOE steel pipe molding, one weld, submerged arc welding process, specifications range from 325mm - 1420mm. When the diameter of the Direct-Seam Submerged Arc Welding Pipe is greater than 914.4mm, the Standard Stipulates that the Steel Pipe is allowed to have two Straight Welds.