... ,Q235,Q345,ST37,ST52Zinc thickness:30-80um(200-600g/m2)Size: from Size 20--Size 200 Galvanized ChannelSpecification: JIS G3141,GB Q235 ... ,SS400,Q235,Q345,ST37,ST52,ST275,S275JRZinc thickness:30-80um(200-600g/m2)Size: 50mm-400mm Galvanized Steel FlatSpecification: JIS G3141 ... ,SS400,Q235,Q345,ST37,ST52,ST275,S275JRZinc thickness:30-80um(200-600g/m2)Thinckness:2mm-5mm Update Date:2011-2-16 ...