... steel pipe 1.size range OD:22-530mm 2.more grades of material 3.professional for years Carbon Steel seamless PipeStandardANSI,ASTM ... DIN,GB.JISMaterialA106 Gr A,B,A53 Gr B,ASTM A179,A106GrB,ASTM A53GrB,St42,St45,A179,A135,A315B,A214CA333 Gr 6 ... ,SCH10,SCH20,SCH40,SCH60,SCH80,SCH100,SCH120,SCH160,XXSUsageStructure Use,water transport,Building,Machinery,Traffic,Aviation,Oil development ect.OD TolleranceD ...