We are Tianjin Zhongshun Petroleum Steel Pipe Co., Ltd, a leading ERW and SSAW steel pipe manufacturer in China Mainland. We are based in northern China with capacity 600, 000 tons annual. We supply high quality steel pipes Including, API 5L line pipe, API 5CT casing/tubing pipe, ASTM / BS pipe, as well ASTM A252 pipes for piling purpose. The product range as follow: ERW Steel Pipe Outside Diameter 21.3 mm (1/2")-457.2 mm (18") Wall Thickness 3mm-14.27mm (S235) Maximum Length 12 M Material S235, S275, S355. GrA, GrB, X42, X46, X52 or equivalent material SSAW Steel Pipe Outside Diameter 219.1mm (8") - 3048 mm (120") Wall Thickness 4 mm-30 mm (S235), 4mm-26mm (X80) Maximum Length 20 M Material S235, S275, S355, GrA, GrB, X42-X80 or equivalent material We have got the API 5L PSL2 / 5CT and CE certification; therefore, we believe that we can provide you the suitable products with best quality. Hence, kindly let me know if you are looking for steel pipe products, we will provide you the most competitive price. Thank you in advance.