... Q345B, SS400, S235JR, S275JR, S355JR 3) Standard:GB/T11263 One kind of profile bars with "I" shape section, the specification ... # , 100mm to 900mm 2) Grade: Q235, Q345,Q345B, SS400, S235JR, S275JR, S355JR3) Standard:GB/T11263application: Can be widely used in ... various construction structure, bridge,blackets,mechanism and so ...