... GRB, A53 GRB, API 5L,GRB, A106-B Seamless Steel PipeCompany NameShijiazhuang Beihai Pipe CO.,LTDBusiness ... C at sight3ApplicationStructure transport gas and oil,making machine part and so on. StandardGradeSpecificationsGB10#,20#,45#,16MnO ... ,A179-C,A214-C,A192,A226,A315-B,A53-B,A178-C,A210-A-1,A210-CDINSt33, ... 4,St52JISG3452,G3457,G3454,G3455,G3456,G3461API 5LA,B,X42,X46,X52,X56,X60,X70,X65, ...