Garden ornaments Large Square Corten Steel Rustic fashion flower pots & plantersWeathering steel , as its name suggests , is designed to resist atmospheric corrosion . Its also called cor-ten or corten steelAs the time flies , a protective layer will form on the surface after several months , from yellow to brown , or rustic red . Thisallows the products to last decades , which is much durable than carbon steel , galvanized steel plastic , etc..