NAICS 2022 nationalIndustry USA Verified: Census NAICS 2022 · 2026-01-01

NAICS 331110 — Iron and Steel Mills and Ferroalloy Manufacturing

Iron and Steel Mills and Ferroalloy Manufacturing

NAICS 331110 is the national industry code for iron and steel mills and ferroalloy manufacturing establishments in the United States. The Small Business Administration sets a size standard of 1,500 for this classification. It forms part of the hierarchical North American Industry Classification System maintained by the Census Bureau.

SBA: 1,500 View full SBA standard

Official Inclusions

operation of electric arc furnace mini-mills
producing ferro-alloys
producing iron and steel basic shapes, such as plates, sheets, strips, rods and bars, and other fabricated products or casting ingots only

Exclusions & Cross-References

Activities classified under other official NAICS codes:

manufacturing iron and steel basic shapes by cold-rolling purchased metal, or drawing wire from purchased bars, rod or wire (See 33122 Rolling and drawing of purchased steel)
manufacturing iron and steel pipe and tube, from purchased metal (See 331210 Iron and steel pipes and tubes manufacturing from purchased steel)
operating coke ovens (See 324190 Other petroleum and coal product manufacturing (CAN))

Official Illustrative Examples

Primary activities officially recognized by Census Bureau / Statistics Canada:

blast furnaces direct reduction of iron ore electric arc furnace steel mills iron ore recovery from open hearth slag reclaiming iron and steel scrap from slag

Complete Index of Activities (91 recognized activities) ▼

armour plate, made in steel mills

axles, rolled or forged, made in steel mills

bars, iron or steel, made in steel mills

billets, steel, made in steel mills

blackplate, made in steel mills

blast furnaces

blooms, steel, made in steel mills

coke oven products, made in steel mills

cold rolled steel shapes (e.g., bar, plate, rod, sheet, strip), made in steel mills

concrete reinforcing bars, made in steel mills

direct reduction of iron ore

drawing iron or steel wire in steel mills

electric arc furnace steel mills

electrometallurgical ferro-alloys, manufacturing

fence posts, iron or steel, made in steel mills

ferro-chromium, manufacturing

ferro-manganese, manufacturing

ferro-molybdenum, manufacturing

ferro-nickel, manufacturing

ferroniobium, manufacturing

ferro-phosphorus, manufacturing

ferro-silicon, manufacturing

ferro-titanium, manufacturing

ferro-tungsten, manufacturing

ferro-vanadium, manufacturing

flakes, iron or steel, made in steel mills

flats, iron or steel, made in steel mills

forgings, iron or steel, made in steel mills

frogs, iron or steel, made in steel mills

galvanized metals and metal formed products, made in steel mills

gun forgings, made in steel mills

high percentage non-ferrous alloying elements (i.e., ferro-alloys), manufacturing

high purity ferro-alloy additive elements, manufacturing

hoops, made in steel mills

hot-rolled iron and steel products, made in steel mills

ingot, made in steel mills

iron ore recovery from open hearth slag

iron sinter, made in steel mills

manganese metal ferro-alloys, manufacturing

mesh, wire, made in steel mills

mini-mills, steel

molybdenum silicon ferro-alloys, manufacturing

nut rods, iron or steel, made in steel mills

operation of electric arc furnace mini-mills

paste, iron or steel, made in steel mills

pig iron, manufacturing

pilings, iron or steel plain sheet, made in steel mills

pipe, iron or steel, made in steel mills

plate mill

plates, steel, manufacturing

powder, iron or steel, made in steel mills

producing ferro-alloys

producing iron and steel basic shapes, such as plates, sheets, strips, rods and bars, and other fabricated products or casting ingots only

rail joints and fastenings, made in steel mills

railroad crossings, iron or steel, made in steel mills

rails, iron or steel, made in steel mills

rails, rerolled or renewed in steel mills

reclaiming iron and steel scrap from slag

rods, iron or steel, made in steel mills

sheet pilings, plain, iron or steel, made in steel mills

sheet, steel, made in steel mills

shell slugs, steel, made in steel mills

silico-manganese ferro-alloys, manufacturing

skelp, iron or steel, made in steel mills

slab, steel, made in steel mills

spiegeleisen ferro-alloys, manufacturing

spike rods, made in steel mills

sponge iron, manufacturing

stainless steel, made in steel mills

steel balls, made in steel mills

steel mills

steel products (e.g., bar, plate, rod, sheet, structural shapes), made in steel mills

steel, manufacturing

strip, galvanized iron or steel, made in steel mills

strip, iron or steel, made in steel mills

structural shapes, iron and steel, made in steel mills

superalloys, iron or steel, made in steel mills

terneplate, made in steel mills

ternes, iron and steel, long or short, made in steel mills

tie plates, iron or steel, made in steel mills

tin free steel, made in steel mills

tinplate, made in steel mills

tool steel, made in steel mills

tube rounds, iron or steel, made in steel mills

tube, iron or steel, made in steel mills

tubing, seamless steel, made in steel mills

tubing, wrought iron or steel, made in steel mills

well casings, iron or steel, made in steel mills

wheels, car and locomotive, iron or steel, made in steel mills

wire products, iron or steel, made in steel mills

wrought iron or steel pipe and tubing, made in steel mills

Official data

Feature	Description
Official name	North American Industry Classification System (NAICS) 2022
Issuing authority	U.S. Census Bureau with OMB, Statistics Canada, and INEGI
Tax authority	Internal Revenue Service (IRS)
Purpose	Statistical business classification and federal contracting (SAM.gov, SBA standards)
Used in	SAM.gov registration, SBA size determinations, IRS tax classification, SEC EDGAR (via SIC crosswalk)
Active since	2022 (current edition)
Hierarchy level	Sector (2-digit)
Source	https://www.census.gov/naics/