Iron & Steel Mills & Ferroalloy Manufacturing
Key Figures
Figures are published for NAICS 33111 directly.
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Official definition
This industry comprises establishments primarily engaged in one or more of the following: (1) direct reduction of iron ore; (2) manufacturing pig iron in molten or solid form; (3) converting pig iron into steel; (4) making steel; (5) making steel and manufacturing shapes (e.g., bar, plate, rod, sheet, strip, wire); (6) making steel and forming pipe and tube; and (7) manufacturing electrometallurgical ferroalloys. Ferroalloys add critical elements, such as silicon and manganese for carbon steel and chromium, vanadium, tungsten, titanium, and molybdenum for low- and high-alloy metals. Ferroalloys include iron-rich alloys and more pure forms of elements added during the steel manufacturing process that alter or improve the characteristics of the metal.
Source: US Census Bureau, 2017 NAICS Definitions. Public domain. Census publishes this definition under NAICS 331110, the only detailed industry in this group.
Which code does this activity belong in?
Iron and Steel Mills and Ferroalloy Manufacturing comprises establishments that produce steel from raw materials, including direct reduction of iron ore, manufacturing pig iron, converting pig iron to steel, and making ferroalloys that enhance steel properties. The boundary with Steel Product Manufacturing from Purchased Steel is that the latter processes steel that has already been made, such as drawing wire or rolling shapes from purchased steel; whereas Iron and Steel Mills and Ferroalloy Manufacturing creates the base steel itself or produces the alloy elements incorporated during the steelmaking process.
Written for NAICS 331110, the only detailed industry in this group.