1)grade:Q345.10#.20#, 2)outer diameter:10-50mm thickness:1-10mm 4)standards:ASTM -A53, ... 200 specification galvanized Seamless Steel Pipe grade:Q235,16Mn,10#,20#standard:ASTM/GB/JIS/ISO typegalvanized Seamless Steel PipegradeQ345,16Mn ... .10#.20#.specificationOD:10-50mmWT:1-10mmstandardsASTM/ASME/GB/JISsurface finishingannealed/ ...