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steel

A staircase frame built of steel beams or other steel supports.

A steel staircase is a set of steps in a built object whose supporting framework is built of steel, a very strong iron alloy with a high carbon content. The tensile strength of steel makes it suitable for almost any stairway configuration, and it is one of the best materials for freestanding staircases (like many helical stairways for example). It is also useful for staircases that bridge a wide space without supporting columns in the middle.

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