Cast iron
Cast iron is made from pig iron, which is the product of smelting iron ore in a blast furnace. Cast iron can be made directly from the molten pig iron or by re-melting pig iron, often along with substantial quantities of iron, steel, limestone, carbon (coke) and taking various steps to remove undesirable contaminants. Phosphorus and sulfur may be burnt out of the molten iron, but this also burns out the carbon, which must be replaced. Depending on the application, carbon and silicon content are adjusted to the desired levels, which may be anywhere from 2–3.5% and 1–3%, respectively. If desired, other elements are then added to the melt before the final form is produced by casting.
Cast-iron cookware
However, cast iron has seen a resurgence of its popularity in specialty markets. Through cooking shows, celebrity chefs have brought renewed attention to traditional cooking methods, especially the use of cast iron. In the 2010s, small startup companies such as FINEX, Element Cookware, Smithey Ironware Company, Marquette Castings, Stargazer Cast Iron and Borough Furnace began producing cast-iron cookware designs for specialty cooking markets.