Thick-walled Square Tube by the production process: hot rolled seamless square tube, cold drawn seamless square tube, extruded seamless square tube and welded square tube.
a. by technology - arc welding square pipe, ERW square tube (high-frequency, low frequency), gas welding square tube, square tube of furnace welding
b. weld points - straight seam welded square tube, spiral welded square tube.
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