NAICS 331110: Iron and Steel Mills and Ferroalloy Manufacturing

NAICS 331110 – Iron and Steel Mills and Ferroalloy Manufacturing encompasses the primary production of crude steel through blast furnace, electric arc furnace, or other smelting processes, as well as the manufacturing of ferroalloys used to impart specific metallurgical properties to steel products. This sector supports critical infrastructure, defense systems, and industrial equipment by supplying raw steel billets, slabs, and alloyed ingots essential for structural components, armor plating, heavy machinery, and ordnance. In government contracting, this NAICS code serves as a foundational link in the defense and federal supply chain, enabling downstream fabrication of military vehicles, ship hulls, rail systems, and energy infrastructure components. Unlike downstream fabrication or machining, this code focuses on the initial transformation of iron ore and scrap into base metallic inputs, requiring high-temperature processing, precise chemical control, and stringent quality assurance protocols. Top contractors in this sector include ONEIDA BUSINESS ENTERPRISES, INC., MOUNTAIN PACIFIC CONTRACTING AND CONSULTING LLC, and ALLOY SLING CHAINS, LLC, reflecting a mix of small businesses and specialized manufacturers focused on niche ferroalloy supply, alloyed steel components, and mission-critical material handling systems. These firms often operate as tiered suppliers to larger defense primes, leveraging niche expertise in high-strength, corrosion-resistant, or heat-tolerant metallurgical formulations. The Department of the Interior and the Department of Defense are the primary federal buyers, with demand driven by infrastructure modernization, military vehicle and vessel construction, and maintenance of heavy equipment in remote or corrosive environments. Procurement typically targets certified suppliers capable of meeting MIL-SPEC or ASTM standards for mechanical integrity and traceability. The competitive landscape is concentrated among specialized manufacturers with certified metallurgical capabilities, presenting opportunities for small businesses with expertise in alloy development, scrap recycling, or just-in-time delivery of ferroalloys. Procurement trends indicate growing emphasis on domestic sourcing, supply chain resilience, and compliance with Buy American Act requirements for critical steel inputs.