Classification of pipe fittings
1. according to the production methods category
(1) – hot rolled seamless tube pipe, cold rolling mill, cold drawn tubes, extruded tube, top tube
(2) pipe (a) according to the process--arc welding, resistance welding pipe (high frequency, low frequency), the gas pipe, stove pipe (b) according to the weld--straight seam welded pipe and spiral welded pipe
2. the cross-section shape classification
(1) simple section pipe--round pipe, and square pipe, and oval pipe, and triangle pipe, and six angle shaped pipe, and diamond pipe, and octagonal pipe, and semicircle steel round, and other (2) complex section pipe--ranging side six angle shaped pipe, and five flap plum shaped pipe, and double convex shaped pipe, and double concave shaped pipe, and seeds shaped pipe, and round tapered pipe, and corrugated shaped pipe, and table shell pipe, and other
3. according to the classification – thin-walled steel tube wall thickness ⒑
4. classified by use – pipes with steel pipes, steel tubes for thermal equipment, machinery and industrial steel containers, oil, geological drilling pipe, pipe, chemical pipe, a special-purpose, other.
