GB standard I beam (1) material: Q235,SS400,A36,ST37-2,EN10025 (2)Size: ... *180*17mm (3)packing:bulk or container GB Standard I-Beam (1) material: Q235,SS400,A36,ST37-2,EN10025,S235JR (2 ... .5123.963a63017613121.40763b63017815131.29863c63018017141.189 GB Standard Hot Rolled I-Beam