... standard I beam sizes 1.standard:chinese standard 2.material:Q235,SS400,ST37-2,S235JR 3.size:80mm-300mm 4.length ... :6m,9m metal structral steel i beam price 1.standard:chinese standard ... 2.material:Q235,SS400,A363.size:80*50*4.5mm-300 ... *126*9mm 4.length:6m,9m,12m or as ...