Steel pipes are divided into seamless steel pipes and welded steel pipes (seamed pipes), hot-rolled seamless square pipes, cold-drawn seamless square pipes, extruded seamless square pipes, and welded square pipes.

Among them, welded square pipes are divided into:

1. Distinguished by process: arc welded square tube, resistance welded square tube (high frequency, low frequency), gas welded square tube, furnace welded square tube

2. Distinguish according to welding seam: straight seam welded square pipe, spiral welded square pipe.

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