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Steel has been part of the greatest achievements in history. It was the "iron horse" and steel rails that helped carve a nation out of the frontier. Steel is the backbone of bridges, the skeleton of skyscrapers and the framework of automobiles. Now in the 21st century, it is still revolutionizing the way we live. It is high strength frames for eyeglasses; it is a strong durable frame in housing and it's precise surgical instruments used in hospital operating rooms around the world. Iron has been a vital material in technology for well over 3,000 years. But until the Industrial Revolution, its mining, smelting, and working were largely done by individuals and small groups. Known since ancient times, steel is made by alloying iron with carbon to produce a harder stronger metal. Steel was very expensive to manufacture by the primitive methods available and was used largely for specialty items such as...

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