Subsector 331 - Primary Metal Manufacturing
331111
 Iron and Steel Mills
331112
 Electrometallurgical Ferroalloy Product Manufacturing
331210
 Iron and Steel Pipe and Tube Manufacturing from Purchased Steel
331221
 Cold-Rolled Steel Shape Manufacturing
331222
 Steel Wire Drawing
331311
 Alumina Refining
331312
 Primary Aluminum Production
331314
 Secondary Smelting and Alloying of Aluminum
331315
 Aluminum Sheet, Plate and Foil Manufacturing
331316
 Aluminum Extruded Product Manufacturing
331319
 Other Aluminum Rolling and Drawing
331411
 Primary Smelting and Refining of Copper
331419
 Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum)
331421
 Copper Rolling, Drawing and Extruding
331422
 Copper Wire (except Mechanical) Drawing
331423
 Secondary Smelting, Refining, and Alloying of Copper
331491
 Nonferrous Metal (except Copper and Aluminum) Rolling, Drawing and Extruding
331492
 Secondary Smelting, Refining, and Alloying of Nonferrous Metal (except Copper and Aluminum)
331511
 Iron Foundries
331512
 Steel Investment Foundries
331513
 Steel Foundries (except Investment)
331521
 Aluminum Die-Casting Foundries
331522
 Nonferrous (except Aluminum) Die-Casting Foundries
331524
 Aluminum Foundries (except Die-Casting)
331525
 Copper Foundries (except Die-Casting)
331528
 Other Nonferrous Foundries (except Die-Casting)