... design,fabricate and install all kinds of steel structure warehouse,workshop,showroom,shopping mall ,store etc. A: We ... design,process, installation fabrication,etc ,and our steel structure building standards come from USA, Austrialia,and europe ... than12000mm4Upright postH steel structure composed of jointing steel board,Q345or Q235.5Roof girderH steel structure composed of jointing steel board,Q345or ...