Welcome to China Zhonghai Steel Pipe Manufacture Co, Ltd.We are one of the best professional manufacturer , and we have 6 large standard workshop, one set 180mm seamless puncher, which could manufacture various kinds of diameter and wall thickness from 219mm-1220mm. Our featured products are big size seamless steel pipe, hot-rolled steel pipe, hot-expanded steel pipe and spiral steel pipe .Diameter between 8"and 48", wall thinkness from 6mm-60mm. These products are widly used in extraction and processing of petroleum and natural gas , pipeline transportation, machinofacture, boilermaking, and the big construction item. Our factory has the approval I American Petroleum Institute-API. Also We have established long-term business with customers from American, Canada, Russia, Germany, Italy, Middle east area ect. We sincerely look forward to cooperating with you ! If any iterm is interest to u , please do not hesitate to contact me , Julia is always here for you .