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The Top500-Lexicon

The lexicon of the top500 ( The Encyclopedia for Classification Codes ) explains the codes and definitions in the world of economical classifications.

NAICS Code 331 Primary Metal Manufacturing

The NAICS Code 331 is described as
Primary Metal Manufacturing
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.


It belongs to the code group
NAICS Code 33 Manufacturing

To this Code "331" belongs the sub codes
  • NAICS Code 3311: Iron and Steel Mills and Ferroalloy Manufacturing
    (Iron and Steel Mills and Ferroalloy Manufacturing)
  • NAICS Code 3312: Steel Product Manufacturing from Purchased Steel
    (Steel Product Manufacturing from Purchased Steel)
  • NAICS Code 3313: Alumina and Aluminum Production and Processing
    (Alumina and Aluminum Production and Processing)
  • NAICS Code 3314: Nonferrous Metal (except Aluminum) Production and Processing
    (Nonferrous Metal (except Aluminum) Production and Processing)
  • NAICS Code 3315: Foundries

The equivalent ISIC Code (Rev. 3.1) is
2330: Processing of nuclear fuel
  Traitement de combustibles nucléaires

The nearest NACE Code (Rev. 1.1) is
23.30: Herstellung und Verarbeitung von Spalt- und Brutstoffen
23.30: Processing of nuclear fuel

The equivalent CPC Code (Rev. 1.1) is
xxxx: No Code defined

Translation of the Code description
331: Primary Metal Manufacturing

Alternative Spellings (synonyms): Manufactoring, Manufaktur
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