GB standard I beam (1) material: Q235,SS400,A36,ST37-2, ... *3.6mm-630*180*17mm (3)packing:bulk or container GB Standard I-Beam (1) material: Q235,SS400,A36,ST37-2 ... .60556a56016612.5106.31656b56016814.5115.10856c56017016.5123.963a63017613121.40763b63017815131.29863c63018017141.189 GB Standard Hot Rolled I-Beam