The material shall be standardized as practically possible. The quality of the material shall comply as follows:
- Structural steel ASTM A 36
- Mild steel bolts ASTM E 30, A 307
- High strength bolts ASTM A 325
- Welding AWSD1.1
- Nuts, washers ASTM A 325, A 490
- Cast iron tensile strength no less than 14.2 kN/cm2
All structural steel members shall receive shop protective coating against corrosion either by galvanizing or by paint. Where steel shall be galvanized, the execution of the galvanization shall comply to ASTM A 239.
Prior to the protective coating with paint, the surface of the steel members shall be treated as specified under "Pictorial Surface Preparation Standard" (SSPC "Steel Structures Painting Council" Specifications). The first protective coat shall be applied before assembling and the second protective coat immediately after assembling. Blemished areas have to be touched up before the second coat is applied.