Process:ERW (Electric Resistance Welded)HFI (High Frequency Induction)EFW(ELECTRIC FUSION WELDED TUBE)Quality Standard:ERW HFI , EFW,:GB/T3091 Welded steel pipe for low pressure liquid deliveryGB/T9711 Petroleum and natural gas industries--Steel pipe for pipelinesIS: 3589 Steel tubes for water and sewageIS : 1978-1982? Steel tubes for use in transportation of oil; gas & Petroleum products?BS: 1387 Steel Tubes for use for Water, Gas, Air and SteamASTM A53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and SeamlessDIN 2458 WELDED STEEL PIPES AND TUBESEN10217 Welded steel tubes for pressure purposes. Technical delivery conditions. Non-alloy steel tubes with specified room temperature propertiesAPI 5L Line PipeCoating Standard:ANSI/AWWA C104/A21.4 American National Standard for Cement-Mortar Lining for Ductile-Iron Pipe and Fittings for WaterISO 21809 Petroleum and natural gas industries -- External coatings for buried or submerged pipelines used in pipeline transportation systemsDIN 30670 Polyethylen coatings of steel pipes and fittings.

As clients ordered.