Since the 1970s, the use of weathering steels has spread through Europe. Engineers appreciate its high yield strength and corrosion resistance. Weathering steels also reduce maintenance to nearly zero and can lighten the weight of structures. These advantages make it a very economic material and led to the construction of thousands of bridges and viaducts around the world. Architects like the expressiveness of the material and its ability to fit into urban landscapes and natural environments. Today, weathering steel is more fashionable than ever. It fits with modern ideas that architecture and infrastructure should blend in with the natural and built environment. Using our decades of experience with corrosion resistance mechanisms, ArcelorMittal has developed its own brands of weathering steels: Indaten® for flat products, and Arcorox® for sections. This publication aims to provide you with a good understanding of ArcelorMittal’s weathering steels and how they can be used. We’ve also included several examples of successful projects realised in weathering steels to inspire your future projects.