... Standard:GB/T-11263-2005,JIS G3101 hot dip galvanized H Beam, with 60-70microns zinc galvanizationGrade:Q235,Q345B,SS400Standard:GB ... steel profile with "I" shape section, the other one with "H" shape, also called steel coloumn.The specification is usually expressed ... by middle height (h)* flange width (b)* middle thickness (d), as below image. ...