Despite their names, both cast iron and wrought iron are actually alloys, meaning they contain certain amounts of other materials in addition to iron. Cast iron is usually 2 to 4% carbon and contains small amounts of silicon, manganese and occasionally sulfur and phosphorus. Cast iron is made either by smelting iron ore or pig iron (an intermediate iron ore product) then mixing it with carbon and other metal alloys.
2. Static Storage Tanks Used primarily in industrial settings, these larger tanks are designed for bulk storage of gases, such as propane or natural gas. They are often installed permanently and equipped with advanced safety features.