We are Shandong Zhongzheng Steel Pipe Manufacturering Co., Ltd of China and we have another trading company named Shandong Zhongli Steel Pipe Co., Ltd. We have pasted the ISO and API certification.Our company esteblished in 2006 and the first to do export business in our area. We stick to\"costomer is the first, to be honest\", hope we can have a chance to work together. welcome to our factory.