... 280-900g/m2 3. Strong productivity GB/T 3094 erw welded hot dip galvanized carbon mild steel production hollow sections pipes ... ), ST33, ST37, ASTM A500, ASTM A 53: Gr. A, Gr B, Gr C, Q195, Q215, Q235, Q275, Q295, Q345,08F, 08 ... Widely used in construction, bridge, fence, greenhouse, highway, windows of model steel door, machinery, chemical industry, supermarket goods shelf and so ...