Zhangjiakou High-Tech Steel Pipe Co., Ltd is one of the earliest manufacturers specializing in producing the precision steel tubes for automobile, oil casing tubes for petroleum and natural gas, steel tubes for drilling and liquid service, as well as other high strength welded steel tubes. The company has passed the ISO 9001:2000 certification and API certification and our products are qualified to API 5CT or API 5B standard. The outside diameter of tubing is¦2-3/8'-¦4-1/2' , and the outside diameter of casing is ¦4-1/2'-¦5-1/2'. Grade for tubing and casing includes H40, J55, K55, and N80. On Jan 11, 2008, we have become the supplier of CNPC (China National Petroleum Corporation). It is proved by Tubular Goods Research Center of CNPC that ERW tubing and casing of our company have the advantages of high precision, good toughness, low cost and can resist crush and burst well, etc. We have been adhering to the principle of Customers first, Quality foremost. With best quality and excellent service, we are sincerely looking forward to cooperating with domestic and overseas customers.
