... Casing and Tubing pipe 1.Grade: J55,K55,N80,L80,P110 2.Thread: STC ... ,BTC,LTC, 3.Standard: API API seamless steel Grade J55 Casing and Tubing pipe----------------------------------------------------------------------------------------------------Specification API Casing and ... .YingKou OuYang Metal Manufacturing Co., Ltd. sincerely welcome any customers from all over the world to visit our ...