architecture and design for buildings and bridges. Steel and iron sales in the U.S.
grew mostly between 1875 and 1920 and with the numbers it made the united states the “world dominant leader” (steel industry, History)
Before steel, iron was the big thing; it was cheap to make and worked in many different ways. It was brought into the steel industry and mixed it with the steel. Andrew Carnegie was very well known in the steel industry, he made cheap and efficient railroads and much more. At one time he was the largest steel producer in the United States. In 1874 Eads bridge was opened using Carnegie steel (history of the steel industry). To make Iron it is a step by step process. Iron comes from mining into hillsides looking for ore or
iron-deposits.
The first cast iron bridge was made in 1779 and it is still in use today. in the early 1800’s steel began to be used more than wrought iron, and in the 1900’s wrought iron was non existent and steel makers began to use carbon steel instead. Steel is a mixture of iron and carbon making a stronger harder metal. Using steel in bridges opposed to using iron is a very big advantage, although iron is a strong and efficient metal, Steel , when weathered, can endure many different takes of the atmosphere and last a very long time. Using this metal also made it possible to make bridges of any lengths because of its durability and ease of manufacture and maintenance. The first bridge to be built with this material was in 1964 in New Jersey( Teel Footnotes). When building bridges the workers wanted stronger materials. another type of steel used in making bridges was ‘high-strength’ steel, it cost less than other types and it was lighter than most too.