We officially renamed YingKou OuYang Metal Manufacturing Co., Ltd. in April 2011. (Formerly known as YingKou OuYang Steel Tube Co., Ltd.) YingKou OuYang Metal Manufacturing Co., Ltd. is one leading manufacturer in the oil field .Our company is specializing in the process of oil casing, tubing, casing coupling, pup joint, reducer union, drill pipe coupling and also can process the special specification as the customer's request. Meanwhile, we can process the different machined products to ...