I beam steel : 1:Standard: GB/T 700-1988 2.Grade: Q195 Q235 Q345 3. ... structure, bridge,blackets,mechanism and so on. specifcation necessary for inquiries: product name, standard performed,materials, specifcation, quantity, length, handling time, ... or as per clients' requirements. For more information,please contact directly without any hestation. I beam, Steel I beam, Steel profile. GB Standard.