I-Beams 1.Grade:Q235B,Q345B,SS400 2.Thickness:100*100*6*8 3.Length:6m,9m,12m. I-Beams1.Material: ... SS400, ST37-2, A36, S235JRG1, Q235, Q345 etc. 2.Length: 6meter, 9meter, 12meter 3.Chinese standard ... 100*68*4.5mm -630*180*17mm 4.European standard size: 80*46*3.8mm-600*220*12mm DesignationSpecification ... 0725a250116838.10528a2801228.543.49230a300126948.08432a3201309.552.717 I-Beams