Steel is an alloy that mostly consists of iron and also has carbon content. Though Carbon is the most common alloying material for iron, various other alloying elements are also used, such as manganese, chromium, vanadium etc. Steel with increased carbon content can be made harder and stronger than iron, but such steel is also less ductile than iron. It is common today to talk about "the iron and steel industry" as if it was a single entity, but historically they were separate products. The steel industry is often considered to be an indicator of economic progress, because of the critical role played by steel in infrastructural and overall economic development.
Steel warehouses are commercial buildings used for the storage of steel products. They are usually large plain buildings in industrial areas of cities and towns like Sacramento. They usually have loading docks to load and unload goods from trucks.