Zhonghai Steel Pipe Manufacturing Co., Ltd was established in 1997. It has more than 500 emplyees and 6 large standard workshop which occupies area of 135000 square meters. Zhonghai is one of the best professional mills specilizing in producing seamless steel pipe and welding steel pipe, possesses 9 sets of advanced machines including 180mm semless puncher, spiral steel pipe machine, hot-rolled machine, hot-expanded machine as well as hot-sinking machine, which enables us to manufacture various kinds of diameter and thickness from 219mm-1220mm. Our company sets up 9 banch offices in Hong Kong, Shanghai, Beijing, Guangdong, Ningbo, Shijiazhuang, Guangdong Foshan and Guangxi Nanning. The featured products are big size seamless steel pipe, hot-rolled and hot-expanded steel pipe and spiral steel pipe. Our factory has the approval API 5L, CE, ISO and CCS, they are applicable to extraction and processing of petrolrum and natural gas, pipe line transprtation, machinofacture, boilermak