... 5.Place of Origin: China API Casing Tube-----------------------------------------------------------------------------------------------------------------Features Materials: H-40,J-55,K- ... -80,C-90,C-95,P-110,Q-125,Type of End-finish: Plain, BTC ... -80, C-90, C-95, P-110, Q-125OD: from 4 -1/2" to 20”Wall ... 2011. (Formerly known as YingKou OuYang Steel Tube Co., Ltd.)YingKou OuYang Metal Manufacturing Co., ...