gas and oil line pipe Normal OD: 42.3-244.5mm Wall ... thickness: 3-14mm Grade: Q235B,Q345B,L175,L210,L245 Stardard: GB/T9711.1 gas and ... X65, X42, L45StandardGB/T9711.1Length5m-12mUsageline pipe, casing and tubing, fluid pipe, water delivery, heating pipe, ... test,metallographic examinationFinal product testhydraulic test,on-line and off- line ultrasonic test, tensile test,yeild ...