This major group includes establishments engaged in smelting and refining ferrous and nonferrous metals from ore, pig, or scrap; in rolling, drawing, and alloying metals; in manufacturing castings and other basic metal products; and in manufacturing nails, spikes, and insulated wire and cable. This major group includes the production of coke. Establishments primarily engaged in manufacturing metal forgings or stampings are classified in Industry Group 346.

• Industry Group 331: Steel Works, Blast Furnaces, And Rolling And
  • 3312 Steel Works, Blast Furnaces (including Coke Ovens), And Rolling
  • 3313 Electrometallurgical Products, Except Steel
  • 3315 Steel Wiredrawing And Steel Nails And Spikes
  • 3316 Cold-rolled Steel Sheet, Strip, And Bars
  • 3317 Steel Pipe And Tubes
  
  
• Industry Group 332: Iron And Steel Foundries
  • 3321 Gray And Ductile Iron Foundries
  • 3322 Malleable Iron Foundries
  • 3324 Steel Investment Foundries
  • 3325 Steel Foundries, Not Elsewhere Classified
  
  
• Industry Group 333: Primary Smelting And Refining Of Nonferrous
  • 3331 Primary Smelting And Refining Of Copper
  • 3334 Primary Production Of Aluminum
  • 3339 Primary Smelting And Refining Of Nonferrous Metals, Except Copper
  
  
• Industry Group 334: Secondary Smelting And Refining Of Nonferrous
  • 3341 Secondary Smelting And Refining Of Nonferrous Metals
  
  
• Industry Group 335: Rolling, Drawing, And Extruding Of Nonferrous
  • 3351 Rolling, Drawing, And Extruding Of Copper
  • 3353 Aluminum Sheet, Plate, And Foil
  • 3354 Aluminum Extruded Products
  • 3355 Aluminum Rolling And Drawing, Not Elsewhere Classified
  • 3356 Rolling, Drawing, And Extruding Of Nonferrous Metals, Except
  • 3357 Drawing And Insulating Of Nonferrous Wire
  
  
• Industry Group 336: Nonferrous Foundries (castings)
  • 3363 Aluminum Die-castings
  • 3364 Nonferrous Die-castings, Except Aluminum
  • 3365 Aluminum Foundries
  • 3366 Copper Foundries
  • 3369 Nonferrous Foundries, Except Aluminum And Copper
  
  
• Industry Group 339: Miscellaneous Primary Metal Products
  • 3398 Metal Heat Treating
  • 3399 Primary Metal Products, Not Elsewhere Classified