According to the specifications for substation foundations, which type of steel is required for anchor bolts and nuts?

The requirement for hot-dipped galvanized steel for anchor bolts and nuts is crucial in substation foundations due to its protective properties against corrosion. Substations are often located in environments where they are exposed to moisture, chemicals, and other elements that can lead to rusting and degradation of materials. Hot-dipped galvanization involves coating the steel with a layer of zinc, which acts as a barrier against corrosion and significantly extends the life of the bolts and nuts.

The choice of hot-dipped galvanized steel ensures that the structural integrity of the foundations is maintained over time, as it provides a robust solution for protecting metal components in harsh conditions. This is particularly important for the longevity and safety of the substation infrastructure, as any failure of anchor bolts could lead to significant structural issues and increased maintenance costs.

Other materials mentioned, such as bronze or stainless steel, may have their own benefits but do not provide the same balance of strength, cost-effectiveness, and corrosion resistance for this specific application. Cold-rolled steel may not offer adequate corrosion protection on its own without additional coatings or treatments. Thus, the use of hot-dipped galvanized steel aligns with industry standards for durability and maintenance in substation design.