Standard Industrial Code Divisions

Major Group: 33—Primary Metal Industries

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.

Codes	Titles	Total Marketable US Businesses

Industry Group 331: Steel Works, Blast Furnaces, And Rolling And Finishing Mills

3312	Steel Works, Blast Furnaces (Including Coke Ovens), and Rolling Mills	2,648
3313	Electrometallurgical Products, Except Steel	70
3315	Steel Wiredrawing and Steel Nails and Spikes	688
3316	Cold-Rolled Steel Sheet, Strip, and Bars	157
3317	Steel Pipe and Tubes	622

Industry Group 332: Iron And Steel Foundries

3321	Gray and Ductile Iron Foundries	451
3322	Malleable Iron Foundries	27
3324	Steel Investment Foundries	213
3325	Steel Foundries, Not Elsewhere Classified	259

Industry Group 333: Primary Smelting And Refining Of Nonferrous Metals

3331	Primary Smelting and Refining of Copper	37
3334	Primary Production of Aluminum	195
3339	Primary Smelting and Refining of Nonferrous Metals, Except Copper and Aluminum	448

Industry Group 334: Secondary Smelting And Refining Of Nonferrous Metals

3341

Secondary Smelting and Refining of Nonferrous Metals

336

Industry Group 335: Rolling, Drawing, And Extruding Of Nonferrous Metals

3351	Rolling, Drawing, and Extruding Of Copper	171
3353	Aluminum Sheet, Plate, and Foil	294
3354	Aluminum Extruded Products	432
3355	Aluminum Rolling and Drawing, Not Elsewhere Classified	226
3356	Rolling, Drawing, and Extruding of Nonferrous Metals, Except Copper and Aluminum	607
3357	Drawing and Insulating of Nonferrous Wire	695

Industry Group 336: Nonferrous Foundries (castings)

3363	Aluminum Die-Castings	267
3364	Nonferrous Die-Castings, Except Aluminum	138
3365	Aluminum Foundries	444
3366	Copper Foundries	439
3369	Nonferrous Foundries, Except Aluminum and Copper	297

Industry Group 339: Miscellaneous Primary Metal Products

3398	Metal Heat Treating	794
3399	Primary Metal Products, Not Elsewhere Classified	567