331 Primary Metal Manufacturing
3311 Iron and Steel Mills and Ferroalloy Manufacturing
- 33111 Iron and Steel Mills and Ferroalloy Manufacturing
- 331111 Iron and Steel Mills
- 331112 Electrometallurgical Ferroalloy Product
Manufacturing
3312 Steel Product Manufacturing from Purchased
Steel
- 33121 Iron and Steel Pipe and Tube Manufacturing
from Purchased Steel
- 33122 Rolling and Drawing of Purchased Steel
- 331221 Rolled Steel Shape Manufacturing
- 331222 Steel Wire Drawing
3313 Alumina and Aluminum Production and Processing
- 33131 Alumina and Aluminum Production and Processing
- 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
3314 Nonferrous Metal (except Aluminum) Production
and Processing
- 33141 Nonferrous Metal (except Aluminum) Smelting
and Refining
- 331411 Primary Smelting and Refining of Copper
- 331419 Primary Smelting and Refining of Nonferrous
Metal (except Copper and Aluminum)
- 33142 Copper Rolling, Drawing, Extruding, and
Alloying
- 331421 Copper Rolling, Drawing, and Extruding
- 331422 Copper Wire (except Mechanical) Drawing
- 331423 Secondary Smelting, Refining, and Alloying
of Copper
- 33149 Nonferrous Metal (except Copper and Aluminum)
Rolling, Drawing, Extruding, and Alloying
- 331491 Nonferrous Metal (except Copper and Aluminum)
Rolling, Drawing, and Extruding
- 331492 Secondary Smelting, Refining, and Alloying
of Nonferrous Metal (except Copper and Aluminum)
3315 Foundries
- 33151 Ferrous Metal Foundries
- 331511 Iron Foundries
- 331512 Steel Investment Foundries
- 331513 Steel Foundries (except Investment)
- 33152 Nonferrous Metal Foundries
- 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)