Steel has become the primary structural material for bridges due to its light weight, strength, durability, ease of maintenance and construction, low erection costs, and resistance to natural disasters such as earthquakes. New high-performance steels introduced in the 1990s have superior strength and corrosion resistance.
Puring molten steel.
Modern anticorrosive paints provide a protective coating for decades
Another technology for protecting steel in bridge construction is a process known as metallizing where aluminum or zinc is sprayed onto a cleaned steel surface to form a 30-year protective coating.