... of very good quality.We provide you the most competitive price. Product nameERW carbon steel pipe (HFW/HFI)Out diameter21.3mm ... square, grooved, threaded and coupling, etc.FinishBare, varnished, black lacquer, Bitumen Coating, zinc coating, anti-corrosion coating, 3PE, FBE,Epoxy, Cement ... etc. API5L X46 carbon oil/gas/water steel pipe low price