In the transmission industry, the use of weathering steel, also known as COR-TEN, began as early as 40 years ago. Many utilities prefer to use weathering steel because of its aesthetically pleasing brown, organic finish that helps poles to blend into wooded areas. It is also slightly lower in initial cost as a result of eliminating the need for galvanizing. The steel develops a patina, or thin protective layer of rust oxide, which gives the structure its rusty brown color. For weathering ...

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