... ,Q345B,L175,L210,L245 Stardard: GB/T9711.1 gas and line pipePlace of originTianjin China(Mainland)Applicationoil pipeWelding ... test, yeild strength, elogation, impact test, chemical analysis,hardness test, charpy impact test,metallographic examinationFinal product testhydraulic test,on-line and off- line ultrasonic test, tensile test ... ;3.according to the customers' requirement gas and oil line pipe