A simple question: Corten steel?

Question:

Corten steel tends to overheat in hot environments? (for example copper heats up under the sun)

Anwser:

Weathering steel, best-known under the trademark COR-TEN steel and sometimes written without the hyphen as "Corten steel", is a group of steel alloys which were developed to obviate the need for painting, and form a stable rust-like appearance if exposed to the weather for several years.

"Overheating" ?? It's not possible for a metal to get hotter than it's environment unless there is a source of radiation. The sun shining on a metal will heat up a bit, as will any material, but the amount is small and depends on the surface reflectivity.

Define what you mean by "overheating".