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Steel is more than just a building material; it is the physical foundation of the modern urban landscape. Since the Industrial Revolution, the transition from heavy masonry and brittle cast iron to the ductile strength of steel has redefined what is possible in the built environment.

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Architecturally, steel has liberated design from the constraints of load-bearing walls. The development of the allowed for the creation of "curtain walls," where the exterior skin of a building does not support its weight. This innovation gave birth to the skyscraper and the modern open-plan office. Architects can now design vast, light-filled spaces with minimal internal columns, creating a sense of transparency and fluidity that defines contemporary aesthetics. IV. Sustainability and the Circular Economy Steel is more than just a building material;