耐候钢(Corten Steel)是一类合金钢，在室外曝露几年后能在表面形成一层相对比较致密的锈层，因而不需要涂油漆保护。

一种耐候钢的性质取决于它的厚度和合金成分。

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 eliminate the need for painting, and form a stable rust-like appearance if exposed to the weather for several years.