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When steel buildings emerged in the Industrial Revolution, they revolutionized everything! Iron used to be the metal of choice until the Bessemer process made steel—an alloy of iron and carbon—much more affordable and easier to mass produce. The alloy composition of iron and carbon would vary between manufacturers, as would the variation of the additive fused with the iron. While steel had already existed for centuries, it did not become such an easy to produce construction material until the Nineteenth Century. Since the 1800’s when cast iron columns were first used in a mill in Great Britain, the change of metal buildings has been phenomenal in the past several hundred years in both money saving and technology. In the latter half of the Nineteenth Century steel framing system became more popular as a method of building construction (as well as pre-engineered building systems) for several reasons. One reason for the rise in the use of steel is attributed to steel being highly fire-resistant. People were concerned about safety. Another obvious reason is the overall strength of steel. Buildings built with steel are stronger and can last longer.