gas and oil line pipe Normal OD: ... ,L175,L210,L245 Stardard: GB/T9711.1 gas and line pipePlace of originTianjin China(Mainland)Applicationoil pipeWelding ... X65, X42, L45StandardGB/T9711.1Length5m-12mUsageline pipe, casing and tubing, fluid pipe, water delivery, heating pipe, power ... test,metallographic examinationFinal product testhydraulic test,on-line and off- line ultrasonic test, tensile test,yeild ...