STEEL I BEAM 1.Grade:Q235B,Q345B,SS400 2.Length:6m,9m,12m 3.Thickness:100*100*6*8 STEEL I BEAM1.Material:SS400,ST37-2.A36,S235JRG1,Q235,Q345etc2.Length: 6meter,9meter,12meter3.Chinese standard size;100*68*4.5mm-630*180*17mm4.European standard size:80*46*3.8mm-600*220*12mm DesignationSpecification(mm) Weight(kg/m) hbb 10100684.511.2811212074513.98714140805.516.891616088620.51318180946.524. ...