Hebei Zhongyuan Steel Pipe Manufacturing Co., Ltd. is the professional manufacturer of steel pipe, which was set up in 1993. It covers 545,000 square meters in all and total assets up to 950 million RMB. There are 1,200 employees in all and 9 sets of advanced SSAW pipe production line, 4 sets of ERW(stretch reduction) pipe production line. The outside diameter of Spiral