Zhangjiakou High-Tech Steel Pipe Co., Ltd. was established in 2005, on the basis of Ningyuan Iron & Steel Works which had changed its old economic ***** is one of the manufactures that have specialized in producing the electrically-welded steel pipes the earliest in China. The company has equipments and technologies of the high-strength electrically-welded steel pipes line which were imported from ***** high frequency induction equipment is imported from EFD, which is in ***** equipments of threading line of tubing and casing used for petroleum and the process line of coupling were imported from ***** whole equipments and process technologies is advanced in the ***** tubing and casing of grade J55 and N80 which produce in the company have covered the blank of high grade ERW tubing and casing in the ***** production line of tubing of grade N80 is the only one in the ***** company can produce 150.000 tons tubing and casing a year. According to ISO 9001�API Spec Q1, the company have implemented an efficient quality assurance ***** standard used for product is API 5CT�API ***** ERW tubing and casing which produced by the company is certificated by Tubular Goods Research Center of CNPC in November, ***** product have the advantage of high precision, good toughness, low price and can resist crush and burst well, ***** can instead of seamless tubing and casing gradually, to reduce the cost of the establish of the well. The company is conveniently located in High-Tech New District, Zhangjiakou city, occupying an area of 164082 square meters and has a 3.5Km special railway line. The company has been adhering to the principle of Quality First and keeping introducing the advanced technology and learning up-to-date management experience from home and broad, ensured to provide products with excellent quality to all customers.