I --Beam 1) Size: 10# - 63# , 100mm to 900mm 2) Grade: Q235, Q345,Q345B, SS400, S235JR, S275JR, S355JR 3) Standard:GB/T11263 One ... kind of profile bars with "I" shape section, the specification ... )* web thickness (d). I --Beam1) Size: 10# - 63# , 100mm to 900mm 2) Grade: Q235, Q345,Q345B, SS400, S235JR, S275JR, S355JR3) Standard ...