... (EN 10025), ST33, ST37, ASTM A500, ASTM A 53: Gr. A, Gr B, Gr C, Q195, Q215, Q235, Q275, Q295, Q345,08F, ... Widely used in construction, bridge, fence, greenhouse, highway, windows of model steel door, machinery, chemical industry, supermarket goods shelf ... Size (Hot Sales!) GB Main Products (Specification)Rectangle pipe SpecificationThicknessSpecificationThickness20*301.2-3.0100*501.5-5.040*201 ...