# Steel: how the industry works Canonical: https://industrywiki.org/industry/steel/ Published: 2026-10-26 Steelmakers convert iron-bearing material into specified metal products. Production route, metallic input quality, energy, finishing capability, and customer demand determine where value is created. ## scope Covers crude steel production, casting, rolling, and finishing. Mining ore, collecting scrap, and fabricating structures are connected activities. The two main production routes have different input requirements and emissions profiles; neither describes every plant. ## segments ### name Integrated steelmaking ### description A blast furnace produces iron from ore; a basic oxygen furnace refines it into steel. Coke, ore, and integrated infrastructure shape the cost base. ### name Electric arc furnace production ### description Melts scrap and other metallic inputs using electricity. Direct reduced iron can help achieve the required chemistry and product quality. ### name Rolling and finishing ### description Transforms semi-finished steel into sheet, plate, bars, sections, or specialized products through rolling, heat treatment, and coating. ## flow ### name Prepare metallic inputs ### description Select ore, scrap, direct reduced iron, and other inputs according to the production route and target chemistry. ### name Make and refine steel ### description Reduce iron ore where needed, melt metallic inputs, and adjust chemistry. Remove impurities and control temperature. ### name Cast ### description Solidify liquid steel into slabs, billets, blooms, or other forms. Defects at this stage can carry into later processing. ### name Roll and finish ### description Shape and treat the metal to achieve dimensional, strength, surface, and corrosion-resistance requirements; test and ship. ## economics ### revenue Unit A tonne of a particular grade and finished product, with pricing reflecting specification and contract terms. ### payers Manufacturers, construction fabricators, service centers, and distributors purchase steel suited to their production requirements. ### costs #### name Metallic inputs #### explanation Ore, scrap, direct reduced iron, alloys, and yield losses affect the metal cost of each saleable tonne. #### name Energy and conversion #### explanation Electricity, fuel, reductants, labor, maintenance, and finishing determine the cost of changing raw inputs into the ordered product. ### capital Furnaces, casters, rolling mills, and environmental controls are major investments. A bottleneck in finishing can prevent additional crude steel capacity from becoming saleable output. ### working Capital Metal stocks, semi-finished goods, customer credit, and commodity-price changes create substantial cash exposure. Purchasing inventory before prices fall can compress margins. ### mechanism A steel spread compares the selling price with relevant metallic and energy costs. It is not net profit: route-specific conversion, yield, fixed costs, logistics, and product mix still matter. Premium grades may require more processing and qualification rather than simply more metal. ## operations ### activities - Charge selection and metallurgical control - Casting, rolling, and scheduled maintenance - Order sequencing and quality certification ### assets - Furnaces, casters, and rolling mills - Material yards and pollution-control equipment ### roles - Metallurgists and furnace operators - Maintenance engineers and quality specialists ### records - Heat chemistry and material traceability - Test certificates and coil or batch histories ### software - Process automation and production planning - Laboratory and maintenance systems ### metrics #### name Metallic yield #### definition Saleable metal output divided by metallic input over a defined process. #### why Captures scrap, scale, trimming, and quality losses. #### name Conversion cost #### definition Processing cost per saleable tonne on a consistently defined basis. #### why Separates plant performance from raw-material price movement. #### name On-time specification fulfillment #### definition Orders delivered on time and meeting the agreed grade and dimensions. #### why Customer production depends on both quality and delivery. ## structure - Scrap is not homogeneous. Residual elements and contamination can constrain which grades a furnace can make, so access to suitable scrap or cleaner metallic inputs matters. Recycling capacity alone cannot eliminate all requirements for primary iron. - Steel demand follows customer production and construction. Product qualification, rolling geometry, location, and trade conditions divide the market into segments. A shortage of one grade can coexist with weak demand for another, while adding generic capacity may intensify price competition. ## risks ### risk Spread compression ### mechanism Input costs rise faster than contracted selling prices or product prices fall while high-cost inventory remains. ### risk Quality failure ### mechanism Incorrect chemistry, surface defects, or dimensional deviations cause rework, downgrading, or customer rejection. ### risk Operating and environmental disruption ### mechanism Furnace, casting, or emissions-control failure can interrupt tightly connected production stages. ## dependencies ### upstream #### slug mining #### label Mining #### relationship Supplies iron ore, metallurgical coal, and alloying minerals. #### slug waste-recycling #### label Waste and recycling #### relationship Recovers and grades steel scrap. #### slug electric-utilities #### label Electric utilities #### relationship Provide power, particularly important for electric arc furnaces. ### downstream #### slug automobile-manufacturing #### label Automobile manufacturing #### relationship Buys qualified sheet and specialized steel products. #### slug construction #### label Construction #### relationship Uses reinforcing bar, sections, and fabricated steel. ### substitutes #### label Aluminum, composites, and timber #### relationship Compete in selected functions, subject to strength, weight, lifecycle, joining, and cost requirements. ## worked Example ### title A steel spread is not a profit margin ### assumptions - Illustrative sale price: $800 per saleable tonne. - Metallic inputs: $450; energy and variable conversion: $170; allocated fixed plant costs: $100 per tonne. ### calculation - Metallic spread: $800 − $450 = $350 per tonne. - After stated energy/conversion and fixed plant costs: $350 − $170 − $100 = $80 per tonne. ### takeaway The apparent $350 spread leaves $80 before other omitted costs such as corporate overhead, financing, and tax. Always compare spreads using the same boundary. ## scenario ### change Construction orders fall while mills have purchased expensive metallic inputs. ### effects - Order books thin and selling prices may adjust before input inventory clears. - Lower output raises fixed cost per tonne and may change production sequencing. - Cash recovery depends on inventory discipline and product mix as well as furnace efficiency. ### watch - Metallic spread by product - Inventory value and days - Saleable yield and utilization ## misconceptions ### claim An electric arc furnace always makes steel entirely from scrap. ### correction Its metallic charge can also include direct reduced iron or other iron units, depending on availability and product requirements. ## sources ### id aisi-production ### title Steel Production ### organization American Iron and Steel Institute ### url https://www.steel.org/steel-technology/steel-production/ ### supports Blast furnace/basic oxygen furnace and electric arc furnace routes. ### id worldsteel-inputs ### title Raw materials ### organization World Steel Association ### url https://worldsteel.org/about-steel/raw-materials/ ### supports Input differences and the role of recycled steel and primary iron. ### id worldsteel-energy ### title Energy use in the steel industry ### organization World Steel Association ### url https://worldsteel.org/about-steel/energy-use-in-the-steel-industry/ ### supports How production route, input quality, product mix, and material efficiency affect energy use. ### id census-naics ### title 2022 NAICS definition: Iron and Steel Mills and Ferroalloy Manufacturing ### organization U.S. Census Bureau ### url https://www.census.gov/naics/?details=33111&input=33111&year=2022 ### supports U.S. classification boundary and the code mapping; a partial match is not equivalence between this article and every establishment in the code. ## evidence ### scope - aisi-production - census-naics ### flow - aisi-production - worldsteel-inputs ### economics - worldsteel-energy - worldsteel-inputs ### operations - aisi-production - worldsteel-energy ### structure - worldsteel-inputs ### risks - worldsteel-energy ## related Concepts - yield - operating-leverage - capacity-utilization - working-capital ## classification ### system NAICS ### edition 2022 ### code 331110 ### label Iron and Steel Mills and Ferroalloy Manufacturing ### match partial ## editorial Note Process descriptions draw on the cited primary sources. Business-model interpretation is editorial synthesis; worked-example figures are illustrative assumptions, not industry benchmarks. Regulation and commercial arrangements vary by jurisdiction. Classification mappings use the U.S. 2022 NAICS edition; partial mappings indicate overlapping rather than identical scope. ## companies ### selection Note Illustrative steel producers spanning integrated operations, electric-arc-furnace production, flat products, long products, and specialty grades. Inclusion is not a production-volume or revenue ranking, and operating subsidiaries are identified. ### verified On 2026-10-26 ### entries #### name ArcelorMittal #### kind Company group #### segment Steelmaking and mining #### description Operates steelmaking, mining, research, and distribution activities. Its network illustrates the connection between raw-material supply, steel production, product development, and customer delivery. #### url https://corporate.arcelormittal.com/about-us #### name Gerdau #### kind Company #### segment Long steel and recycling #### description Produces steel using recycled scrap and operates mills and downstream facilities. Its products include structural sections, rebar, and special bar quality for different end uses. #### url https://www2.gerdau.com/ #### name JFE Steel #### kind Subsidiary #### segment Flat and specialty steel #### description JFE Group’s steelmaking company supplies sheets, plates, pipes, electrical steel, and other products. Its portfolio illustrates how rolling and finishing adapt steel to customer specifications. #### url https://www.jfe-steel.co.jp/en/ #### name JSW Steel #### kind Company #### segment Integrated steel production #### description Operates steelmaking facilities and supplies products for infrastructure and industrial applications. Its operations illustrate the coordination of production capacity, product mix, and end-market demand. #### url https://www.jswsteel.in/ #### name Nippon Steel #### kind Company group #### segment Steel production and finishing #### description Manufactures a broad range of steel products through its production network. It illustrates how a steelmaker combines material development, manufacturing facilities, and application-specific customer requirements. #### url https://www.nipponsteel.com/en/ #### name Nucor #### kind Company #### segment Electric-arc-furnace steel #### description Uses electric arc furnaces to produce steel, with recycled scrap as a major input. Its mills illustrate the link between scrap supply, electricity, and finished steel specifications. #### url https://nucor.com/industries-served/energy-solutions/ #### name POSCO #### kind Subsidiary #### segment Integrated steelmaking #### description POSCO Group’s steelmaking business produces steel for manufacturing and construction applications. It illustrates how primary production connects with rolling, coating, and downstream product requirements. #### url https://www.posco.com/ #### name Steel Dynamics #### kind Company #### segment Steel and metals recycling #### description Produces flat-rolled and long steel products alongside metals recycling and fabrication activities. Its operating model illustrates the connections between scrap processing, steel mills, and downstream products. #### url https://www.steeldynamics.com/ #### name Tata Steel #### kind Company group #### segment Steel production and products #### description Manufactures steel through operations serving industrial and construction customers. Its product and manufacturing network illustrates the relationship between steelmaking assets, processing capabilities, and customer applications. #### url https://www.tatasteel.com/ #### name voestalpine #### kind Company group #### segment Specialty and tool steel #### description Produces and processes high-performance materials, including tool steel and specialty steels. Its operations illustrate how metallurgy, heat treatment, and customer-specific processing add value beyond crude steel. #### url https://www.voestalpine.com/group/en/group/overview/organizational-chart/high-performance-metals/ Examples are illustrative, not benchmarks. Editorial method: https://industrywiki.org/methodology/