China Hebei Zhonghai Steel Pipe Manufacturing Co, .Ltd is one of the best professional manufacturers specializing in producing: 1. Large-diameter heavy walled Carbon Steel Seamless Pipe, Out Diameter: 8� to 42� (219mm�1220mm); Wall Thickness: 6mm�50mm. 2. Spiral Steel Pipe (SSAW), Out Diameter: 8� to 88�(219mm�2220mm), Wall Thickness: 6mm�20mm. 3. API 5L Line pipe (B/X42/X52/X60 steel grade), Out Diameter: 8� to 36� (219mm�914mm); Wall Thickness: 6mm�50mm. 4. ERW welded pipe, Out Diameter: 8��26� (219mm�660mm), Wall Thickness: 5.0mm�20mm Standard: ASTM A106 GR.B, ASTM A53 GR.B, API 5L GR.B, EN10204/3.1B, DIN1629-1948, DIN2448, EN10216-1, EN10217-1, SY/T5037-2001, GB/T9711.1 etc. Quality Control : BV, SGS, Lloyds Packing: spray painting, oiling, Anticorrosion & Insulation , Bevel or plain end, protect of pipe end and packaging. We have ISO9001:2000 and API 5L Certificates. Contact � Kellen Young