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Process: ERW (Electric Resistance Welded) HFI (High Frequency Induction) EFW(ELECTRIC FUSION WELDED TUBE) LSAW (Longitudinal Submerge-arc Welded) UO(UOE)、RB(RBE)、JCO(JCOE) DSAW (Double Submerged arc welded) SAW (Spiral Welded) SSAW (Spiral Submerged-arc Welded) Quality Standard: ERW HFI , EFW, LSAW, DSAW: GB/T3091 Welded steel pipe for low pressure liquid delivery GB/T9711 Petroleum and natural gas industries--Steel pipe for pipelines IS: 3589 Steel tubes for water and sewage