The range of alloys utilized is sensational: weathering steel for patina, marine-grade aluminum for weight cost savings
https://www.scribd.com/document/1041186672/Leader-Boxes-Built-to-Last-The-Architect-s-Copper-Requirement-135654
The variety of alloys utilized is sensational: weathering steel for aging, marine-grade aluminum for weight financial savings, and duplex stainless for rust resistance in extreme climates.