Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. metal
8. [metal by composition or origin]
9. [iron and iron alloy]
10. iron alloy
11. steel (alloy)
12. alloy steel

Narrower term/s

• Cor-Ten steel (TM)

Anotations

Scope note:

Steel, containing carbon, manganese, and small amounts of other elements, characterized by high strength and corrosion resistance. Exposure to air creates a pebbly, rusty-looking surface that works to reduce corrosion; this surface film turns a deep purple-brown after a number of years which is why high-strength low-alloy steel is sometimes used for exposed structural members of buildings.