Hunan great steel pipe co.,ltd was founded in 1978 and our enterprise is the predecessor of branch of China's oil pipeline and gas pipeline science research institute, as the most authoritative pipeline engineering research institute,consists of eight backbone institute and line pipe bureau postdoctoral research stations, oil and gas pipe is "safe" the main body of the national engineering laboratory on units, is China technology center and plumbing contractor as well as carbon steel pipe supplier branch of China welding association director branch pipe welding unit.