... Manufacturing Co., Ltd. in April 2011. (Formerly known as YingKou OuYang Steel Tube Co., Ltd.)YingKou OuYang Metal Manufacturing ... now ,our products are widely used in Chinese oilfields such as Changqing oilfield, Daqing oilfield, Shengli oilfield, Liaohe oilfield and ... contact Alibaba.com Customer Support.Please enter English only.Your feedback will appear in our Suggestion Center.To view feedback ...