hot sale I beam 1> Material:Q235, Q345, SS400 2> Length:6M,9m,12m 3>GB/T19001-2008/ISO9001:2008 4>size:50*25*3/4/5 1> Material : SS 400, A36, S235 JR, Q235 etc.2> Length : 6 meter, 9 meter ,12 meter3> Chinese Standard size : 100*68*4.5mm-630*180*17mm4> European Standard size : 80*46*3.8mm-600*220*12mm5>Packing: bundles or knitting bag or according to the requirement6>Standard : GB/T 700-1988 ...