China Zhonghai Steel Pipe Manufacturing Corporation established in 1997.It is one of the biggest pipe producers in Great China. Owned more than 1000 employees, the area is 135000 square meters. Owning 6 large standard workshop, one set 180mm seamless puncher, which could manufacture various kinds of diameter and wall thickness from 21.3mm965mm.The devices are one of the largest seamless and the hot-rolled machine in China.