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One third of the steel used to construct the Tokyo Tower was scrap metal taken from US tanks damaged in the Korean War. The tower is the tallest self-supporting steel structure in the world and was the tallest artificial structure in Japan until April 2010. You can do a google search or wiki lookup for further specific information about the Tokyo Tower.
Steel is an alloy (a partial or complete solid solution that uses one or more elements in a metallic matrix) that consists primarily of iron and has a carbon content of 0.2% and 2.1% by weight, depending on the grade. When iron is smelted from its ore, it contains more carbon than you want, so to become steel, it must be melted and reprocessed to reduce the carbon content to the correct amount – at which point other elements can be added. The liquid is then continously cast into long slabs or cast into ingots. Approximately 96% of steel is continously cast, while only 4% is produced as cast steel ingots. The slabs are hot or cold rolled into sheet metal or plates.
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