... Q235B,Q345B,L175,L210,L245 Stardard: GB/T9711.1 gas and line pipePlace of originTianjin China(Mainland)Applicationoil pipeWelding ... detail1 naked 2 both ends with a plastic cap, thenput the pipe into a bundle covered by plastic cloth ... material testtensile test, yeild strength, elogation, impact test, chemical analysis,hardness test, charpy impact test,metallographic examinationFinal product ...