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Carnegie began to see that steel was eventually going to replace iron for the manufacture of rails, structural shapes, pipe, and wire. In 1873 he organized a steel rail company. The first steel furnace at Braddock, Pennsylvania, began to roll rails in 1874.
By the time he was 30, Andrew Carnegie's business interests included iron works, steamers on the Great Lakes, railroads and oil wells. He was subsequently involved with steel production. Andrew Carnegie built and grew the Carnegie Steel Corporation, at that time the largest steel manufacturing company in the world.