1, Galvanized steel pipes(ERW) 2, Dimension: 21.3-323mm ... coating: 60-400 g/m2 (pre-galvanized steel pipe , galvanized layer 60-80g/m2;hot dipped galvanized ,galvanized layer:250-400g/m2)4) ... Q235,A53,St37StandardASTM/ BS/ GBSurfaceHot dip Galvanized,Zin 250 to 400 g/m2.pre galvanization ,Zinc:60-120g/m2UsageFor low ... Ability20000 metric tons per monthShipmentContainer or bulk Galvanized steel pipes