wrought iron

This term describes a specific material known for its durability and versatility in craftsmanship. While it is often used as a noun to refer to the metal itself, it frequently functions as a compound adjective to describe furniture, gates, or railings. In modern commercial contexts, the term is often used loosely to describe any powder-coated or welded steel that mimics the look of traditional hammered iron, though technically true wrought iron is produced through a specific puddling process.

As a noun, the material is treated as an uncountable mass noun. You would refer to "a piece of wrought iron" or "tons of wrought iron" rather than using a plural form.