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 417 3,670
open 3311xx Iron and Steel Mills and Ferroalloy Manufacturing 22 147
open 3312xx Steel Product Manufacturing from Purchased Steel 86 833
open 3313xx Alumina and Aluminum Production and Processing 73 628
open 3314xx Nonferrous Metal (except Aluminum) Production and Processing 49 447
open 3315xx Foundries 187 1,615
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