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Because steel has a high cost/strength density. In other words, its cheap to use when you take into account that you don't have to use as much of it. And steel has many favorable properties, unlike wood, steel will normally give some indication that it is going to fail (crack, deformation, etc.) where as wood will just break. This is good because it gives you a chance to fix the problem before it becomes life threatening.

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13y ago

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