1、According To Production Methods Classification
(1)Seamless Pipe – Hot-Rolled Pipes, Cold-Rolled Pipes, Cold-Drawn Tubes, Extruded Tubes, Pipe Jacking
(2)Welded Pipe
(A)In Accordance With Sub-Processes – Arc Welded Pipe, ERW Pipe (High Frequency, Low Frequency), Gas Pipe, Furn...
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