carbon STRUCTURAL PIPE 1.Standard:ASTM A179,ASTM A106,ASTM A53,EN10255,API5L,API 5CT, 2.OD:12-610mm MaterialHot Rolled Carbon Steel,Q195,Q215,Q235,A53,St37StandardASTM/ BS/ GBSurfaceHot dip Galvanized,Zin 250 to 400 g/m2.pre galvanization ,Zinc:60-120g/m2UsageFor low pressure liquid delivery such as water and gas.For construction.For greenhouse structureCertificationISO9001-2008PaymentT/T or L/C ...