Iron is one of the most abundant elements on the planet. In its natural form, it may come with various other elements mixed in including manganese, silicon, phosphorus and sulfur. To remove these unwanted elements, iron must be 'smelted,' which is a process that removes the pure iron from the rest of the elements. Wrought iron is simply iron that has been worked, as 'wrought' literally means 'worked,' generally with a hammer. Wrought iron also contains anywhere from .02% to 0.8% carbon, which is absorbed from the charcoal during the process.
In the Middle Ages, wrought iron was used for nearly everything from weaponry to nails. As technology advanced, steel manufacturing grew in popularity, especially after the 1850s. Wrought iron was used in railroads for rails and nails. However, wrought iron---though strong---was not quite strong enough. Railroads that used wrought iron needed to be replaced frequently, some as soon as six weeks on high traffic routes. Wrought iron was also not used for construction due to its relative weakness and eventually became used only for decorative purposes.
Wrought iron has been used decoratively inside and outside of homes for more than 100 years. In the United States, wrought iron balconies with decorative columns were popular in French-style Plantation and Colonial homes in the southern United States. Wrought iron columns also regained popularity in the 1950s throughout much of the United States and were used on porches and inside homes. Wrought iron columns could vary in style from extremely ornate to plain and simple. Flat columns featured patterns such as flowers, leaves, scrollwork or even geometric patterns and shapes.
When used outdoors, as it commonly is, wrought iron is often covered with paint. Wrought iron is often thought to be a maintenance-free material, but this is not entirely true. It can rust and should be inspected yearly. Rust can be scrapped off using a wire brush. If painted, the column should be entirely cleaned and any areas that have rusted should be scraped off and repainted.