NAICS Code Lookup

Iron and Steel Mills and Ferroalloy Manufacturing

General

NAICS Code
331
Industry

Phraseology

Primary Metal Manufacturing

Description

Industries in the Primary Metal Manufacturing subsector smelt and/or refine ferrous and nonferrous metals from ore, pig or scrap, using electrometallurgical and other process metallurgical techniques. Establishments in this subsector also manufacture metal alloys and superalloys by introducing other chemical elements to pure metals. The output of smelting and refining, usually in ingot form, is used in rolling, drawing, and extruding operations to make sheet, strip, bar, rod, or wire, and in molten form to make castings and other basic metal products.

Primary manufacturing of ferrous and nonferrous metals begins with ore or concentrate as the primary input. Establishments manufacturing primary metals from ore and/or concentrate remain classified in the primary smelting, primary refining, or iron and steel mill industries regardless of the form of their output. Establishments primarily engaged in secondary smelting and/or secondary refining recover ferrous and nonferrous metals from scrap and/or dross. The output of the secondary smelting and/or secondary refining industries is limited to shapes such as ingot or billet that will be further processed. Recovery of metals from scrap often occurs in establishments that are primarily engaged in activities, such as rolling, drawing, extruding, or similar processes.

Excluded from the Primary Metal Manufacturing subsector are establishments primarily engaged in manufacturing ferrous and nonferrous forgings (except ferrous forgings made in steel mills) and stampings. Although forging, stamping, and casting are all methods used to make metal shapes, forging and stamping do not use molten metals and are included in Subsector 332, Fabricated Metal Product Manufacturing. Establishments primarily engaged in operating coke ovens are classified in Industry 32419, Other Petroleum and Coal Products Manufacturing.

NAICS CodesNAICS Description
33111Iron and Steel Mills and Ferroalloy Manufacturing
33121Iron and Steel Pipe and Tube Manufacturing from Purchased Steel
33122Rolling and Drawing of Purchased Steel
33131Alumina and Aluminum Production and Processing
33141Nonferrous Metal (except Aluminum) Smelting and Refining
33142Copper Rolling, Drawing, Extruding, and Alloying
33149Nonferrous Metal (except Copper and Aluminum) Rolling, Drawing, Extruding, and Alloying
33151Ferrous Metal Foundries
33152Nonferrous Metal Foundries
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