Hebei Zhonghai Steel Pipe Manufacturing CO,.LTD established in 1997 and offers investments for the plenty of advanced production equipment. The brand products is the bige size including seamless steel pipe(168mm—914mm) and the spiral steel pipe(219mm—920mm). Our factiry has the approval I American Petroleum Institute—API. they are applicable to Extraction and processing of petroleum and natural gas , pipeline transportation, machinofacture, Boilermaking, and the big construction item. Our products not only base on ISO9001-2000 series，but also passed the certification of API. 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.