Primary metal manufacturing

North American Industry Classification System code (NAICS): 331

This subsector comprises establishments primarily engaged in smelting and refining ferrous and non-ferrous metals from ore, pig or scrap in blast or electric furnaces. Metal alloys are made with the introduction of other chemical elements. The output of smelting and refining, usually in ingot form, is used in rolling and drawing operations to produce sheet, strip, bars, rods and wire, and in molten form to produce castings and other basic metal products.

3311 · Iron and steel mills and ferro-alloy manufacturing
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This industry group comprises establishments primarily engaged in smelting iron ore and steel scrap to produce pig iron in molten or solid form; converting…

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3312 · Steel product manufacturing from purchased steel
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This industry group comprises establishments primarily engaged in manufacturing iron and steel pipe and tube, drawing steel wire, and rolling steel shapes, from purchased…

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3313 · Alumina and aluminum production and processing
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This industry group comprises establishments primarily engaged in extracting alumina generally from bauxite ore; producing aluminum from alumina; refining aluminum by any process; and…

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3314 · Non-ferrous metal (except aluminum) production and processing
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This industry group comprises establishments primarily engaged in smelting, refining, rolling, drawing, extruding and alloying non-ferrous metal, except aluminum.

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3315 · Foundries
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This industry group comprises establishments primarily engaged in pouring molten metal into moulds or dies to form castings.

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