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Product Description The square tube?is divided according to the production process: hot rolled seamless square tube, cold drawn seamless square tube, extruded seamless square tube, welded square tube. Among them, the welded square tube is divided into:? (a) According to the process-arc welding square tube, resistance welding square tube (high frequency, low frequency), gas welding square tube, furnacewelding square tube. (b) According to the weld seam-straight seam welded square tube, spiral welded square tube.
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