Bridge engineering

Long-span bridges (such as suspension bridges and cable-stayed bridges) make extensive use of weathering steel and bridge-specific threaded steel. Weathering steel, by adding elements such as copper and chromium, forms a dense oxide layer, which can achieve "coating-free corrosion protection" in coastal and rainy areas, reducing later maintenance costs. Bridge threaded steel ensures the long-term stability of the reinforced concrete structure of bridge piers and bridge decks.