China hebei zhonghai steel pipe manufacturing co, .Ltd is one of the best professional manufacturers specializing in producing: 1. Carbon steel seamless pipe, out diameter: 3(89mm1220mm); wall thickness: 3mm50mm. 2. Spiral steel pipe (ssaw), out diameter: 8(219mm2220mm), wall thickness: 6mm20mm. 3. Api 5l line pipe (b/x42/x52/x60 steel grade), out diameter: 8 (219mm914mm); wall thickness: 6mm50mm. 4. Erw welded pipe, out diameter: 8 (219mm660mm), wall thickness: 5.0mm20mm 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.