... building /warehouse construction Qingdao Baoduo Steel Structure CO.,LTD.Main Grade: Q345B,Q235B Standard:ISO9001,BV CertificationAAA Credit ... ,Logistic centers,and all kinds of steel materials.,etc.Specifications:Main Steel: Q345B,Q235BColumn&Beam: Welded or Hot rolled ... H-sectionWall&Roof: EPS, Rockwall, PU sandwich ,corrugated steel sheetDoor: ...