steel pipe ,tube 1.Standard:BS,ASTM,GB/T,DIN 2.Material:Q195-Q345 ... ,Q215,Q235,Q345,X42,X60,X65,X70,GR.A,GR.BSpecification1.Outer Dianeter:21.3mm-609.6mm ... PIPEST38 GB9948-88A53Gr.B ST45 GB8162-1999A795 ST52 CertificatesISO , API , Quality System Certificates ,Manufacturing MethodCold Drawn Cold Rolled ... hexagonal water proof plastic tarpaulin cover. steel tags ASTM A53 erw carbon steel pipe