... steel, Q235, painted structure6Roof beamDouble slope truss, sealed by the C type steel7 Roof purlinC style steel, Q235, painted structure8Inclined braceround steel ... load50kg/m219Wind pressure:0.45KN/M220Fire proofB2 grade21Resistant temperature-20ºC to 50ºC19The resistant earthquake gradeGrade 7 prefab steel structure ...