The North American Industry Classification System NAICS is a system for classifying industries by a six-digit code. [Wikipedia]
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TOP Description Asmts Reccs
331xxx Primary Metal Manufacturing 444 3,886
open 3311xx Iron and Steel Mills and Ferroalloy Manufacturing 24 158
open 3312xx Steel Product Manufacturing from Purchased Steel 91 878
open 3313xx Alumina and Aluminum Production and Processing 76 651
open 3314xx Nonferrous Metal (except Aluminum) Production and Processing 52 469
open 3315xx Foundries 201 1,730
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