The Steel Supply Chain Explained: From Iron Ore Mine to Market

Steel supply chain defined The steel supply chain runs from iron ore mines and scrap yards through two distinct production routes — blast furnace / basic oxygen furnace (BF-BOF) and electric arc furnace (EAF) — to rolling mills that produce finished products like hot-rolled coil, rebar, and structural sections. China produces roughly 50-55% of the world’s steel. US Section 232 tariffs, China’s export volumes, and raw material costs in iron ore and coking coal all determine the price a buyer pays for steel anywhere in the world.

Table of Contents

1. The Two Production Routes
2. Upstream Raw Materials: Iron Ore and Coking Coal
3. Finished Steel Products and Where They Go
4. How Steel Prices Are Set
5. China’s Role in Global Steel Markets
6. US Steel Tariffs: Section 232
7. Major Export and Import Flows
8. Frequently Asked Questions
9. Key Takeaways

The Two Production Routes

Steel is made in two fundamentally different ways. Understanding the difference matters because each route has different raw material inputs, different cost structures, and different geographic footprints.

Route 1: Blast Furnace / Basic Oxygen Furnace (BF-BOF)

Iron ore is reduced to pig iron in a blast furnace using coke (produced from coking coal) as both the fuel and the chemical reducing agent. The pig iron — liquid, containing about 4% carbon — is then transferred to a basic oxygen furnace where oxygen is blown through to burn off excess carbon and impurities, producing crude steel.

BF-BOF requires significant capital investment and works best at scale: integrated steelworks typically produce 5-15 million tonnes per year. These facilities are expensive to start and expensive to idle. BF-BOF represents roughly 70% of global steel output and dominates in China, Japan, South Korea, and India.

Route 2: Electric Arc Furnace (EAF)

Scrap steel (and sometimes direct reduced iron, or DRI) is charged into an electric arc furnace and melted by passing electrical current through graphite electrodes. No iron ore, no coking coal. EAF is more flexible — furnaces can be switched on and off in response to market demand — and has a significantly lower carbon footprint per tonne of steel.

EAF produces roughly 30% of global steel but 70% of US steel and a rising share in Europe. Mini-mills — smaller, lower-capital EAF facilities built near scrap sources and customers — have taken significant market share in the US over the past 30 years.

Feature	BF-BOF	EAF
Primary input	Iron ore + coking coal	Steel scrap
Capital intensity	Very high	Moderate
Flexibility	Low	High
CO₂ per tonne steel	~1.8-2.0t	~0.4-0.6t
Global share	~70%	~30%
US share	~30%	~70%

Upstream Raw Materials: Iron Ore and Coking Coal

Iron ore is the starting point for BF-BOF steelmaking. The seaborne iron ore market — ore shipped internationally — is dominated by Australia and Brazil, which together account for over 60% of global seaborne supply.

Australia’s Pilbara region (Rio Tinto, BHP, Fortescue) exports predominantly to China, Japan, and South Korea. Brazil’s Carajás system (Vale) also supplies China. Iron ore is priced based on iron content (Fe%) with a benchmark at 62% Fe (the Platts IODEX benchmark). Higher-grade ore (65%+ Fe) commands a premium because it improves blast furnace efficiency and reduces emissions.

Iron ore prices are volatile. The 62% Fe benchmark ranged from roughly $80/tonne to $230/tonne between 2020 and 2022, driven primarily by Chinese steel demand. Spot prices are published daily by Platts and Fastmarkets. CME Group lists iron ore futures.

Coking coal (metallurgical coal, or met coal) is distinct from thermal coal used in power stations. Coking coal is transformed into coke in a byproduct coke oven — a process that drives off volatile matter and produces a strong, porous carbon material that can support the iron ore burden in a blast furnace and chemically reduce iron oxide to iron.

Australia dominates global coking coal exports (Queensland’s Bowen Basin). The US (Appalachia) and Canada are secondary exporters. Russia and Mongolia supply China.

For BF-BOF steelmakers, iron ore and coking coal together represent 60-70% of production costs. This is why seaborne iron ore and coking coal price movements directly feed through to steel prices worldwide.

Finished Steel Products and Where They Go

Crude steel — the liquid steel from either production route — is cast into semi-finished shapes (slabs, billets, blooms) and then rolled or formed into final products. The main product categories:

Hot-Rolled Coil (HRC) — flat steel sheet rolled at high temperature. The largest-volume steel product globally. Used in automotive manufacturing, construction, industrial machinery, and as input for further processing. CME HRC futures (ticker HR) are the US benchmark price for this grade.

Cold-Rolled Coil (CRC) — HRC processed further at room temperature to produce thinner, smoother sheet with tighter dimensional tolerances. Used in car body panels, appliances, and precision applications. Trades at a premium to HRC.

Rebar (deformed bar) — corrugated steel bar used to reinforce concrete. The dominant long steel product for construction. Heavily traded internationally, with Chinese export volumes closely watched.

Wire rod — long steel in coiled form, used to produce wire, fasteners, and spring steel. Turkey is a major wire rod producer.

Structural sections — I-beams, H-piles, channels, angles. Used in construction and infrastructure. Produced primarily in BF-BOF integrated mills and EAF mini-mills.

Plate — thick, flat steel used in shipbuilding, heavy machinery, and infrastructure. Higher value per tonne than HRC.

How Steel Prices Are Set

Steel does not have a single global price. Prices differ by product, geography, specification, and whether the purchase is domestic or imported.

Domestic mill pricing in the US is set by steelmakers (Nucor, Cleveland-Cliffs, US Steel) based on their cost structures, capacity utilization, and competitive dynamics. US domestic HRC prices are consistently higher than international prices because of import barriers.

CME HRC futures (Midwest HRC, ticker HR) allow buyers to hedge against domestic price movements. The contract is cash-settled against the CRU Midwest HRC assessment. US steel service centers and automotive buyers use HRC futures for price risk management.

International seaborne prices are assessed by Platts (S&P Global) and Fastmarkets. Key benchmarks include: HRC Black Sea export (reflecting Chinese and CIS export pricing), HRC Southeast Asia import, and rebar Turkey export.

LME steel futures were launched but have seen limited adoption — the LME’s steel rebar and billet contracts have thin liquidity compared to copper or aluminum. Most steel price risk management uses CME HRC or OTC bilateral arrangements.

The key principle: US domestic steel prices and international seaborne prices can diverge substantially. In 2021-2022, US HRC topped $1,900/tonne while international prices were below $800/tonne — entirely because of import tariffs keeping foreign steel out.

China’s Role in Global Steel Markets

China produces approximately 1.0-1.1 billion tonnes of steel per year — roughly 50-55% of world output. This single statistic defines global steel markets.

China’s steel industry built out aggressively from the 1990s through the 2010s, adding blast furnace capacity ahead of domestic demand to ensure self-sufficiency. The result: persistent overcapacity. When Chinese domestic demand (primarily construction and infrastructure) weakens, mills produce more steel than the domestic market absorbs.

The excess must go somewhere. Chinese steel exports — primarily rebar, HRC, and semi-finished products — flood international markets. In 2015-2016, a surge of Chinese steel exports collapsed international prices and triggered a wave of antidumping cases globally. The same dynamic recurred in 2023-2025 as China’s property market slowed dramatically.

State subsidies (cheap energy, government-backed lending, environmental standard enforcement gaps) allow Chinese mills to operate at costs that competitors elsewhere find difficult to match. This is the origin of the word “dumping” in steel trade policy: exporting at prices below cost of production, supported by implicit or explicit government subsidy.

China’s domestic steel consumption is driven primarily by construction and real estate (historically ~50% of demand), manufacturing, and infrastructure. When China’s property sector contracts — as it did sharply in 2021-2024 after the Evergrande crisis — steel demand falls and exports rise. The whole world feels it.

US Steel Tariffs: Section 232

In March 2018, the Trump administration imposed 25% tariffs on steel imports under Section 232 of the Trade Expansion Act of 1962, citing national security grounds. The tariffs applied to nearly all countries, with exemptions later negotiated for Canada, Mexico, and some EU countries.

The effect was immediate and large. US domestic HRC prices rose sharply above international prices — the “Section 232 premium” reached $300-500/tonne at its peak. US steel mills (Nucor, Cleveland-Cliffs) benefited from protected domestic markets. US steel consumers (auto manufacturers, appliance makers, construction) faced higher input costs.

In 2025, the tariffs were expanded and reinforced. Quota arrangements with EU, UK, and Japan were tightened. The Section 232 regime has become a permanent structural feature of US steel trade policy, not a temporary measure.

For importers and sourcing teams, the practical implications:

• Steel sourced outside the US faces a 25% import duty unless the country of origin has a specific quota or exemption arrangement.
• The Section 232 tariff creates a price floor for US domestic steel by limiting the volume of cheaper international steel that can enter the market.
• Trade deflection: Chinese steel barred from the US directly often moves through third countries (Vietnam, Mexico, South Korea) before re-exporting. This has generated downstream antidumping and countervailing duty cases on transshipment.

Major Export and Import Flows

The United States is the world’s largest steel importer by volume, importing approximately 25-30 million tonnes per year (even with tariffs). Canada and Mexico (exempt from Section 232 under USMCA) are consistently the largest suppliers. South Korea, Brazil, Japan, and Germany are other significant suppliers.

China is the world’s largest steel exporter by volume, exporting 80-100 million tonnes per year in recent years. Chinese exports flow primarily to Southeast Asia, the Middle East, Africa, and Latin America — markets without significant import barriers.

Japan and South Korea are significant exporters of higher-value steel products: automotive sheet, electrical steel, specialty steels. Germany and Austria export high-quality engineering steel into global supply chains.

India has been growing rapidly as both a producer and exporter, with roughly 140 million tonnes of annual capacity and ambitions to reach 300 million tonnes by 2030.

For shipping professionals, the key routes:

• US imports: container (smaller volumes) and bulk/breakbulk carriers from Canada, Mexico, South Korea, Brazil
• Chinese exports: primarily bulk carriers to Southeast Asia, Middle East, Africa
• Australian iron ore to China: Capesize bulk carriers (180,000+ DWT) on the major bulk trade corridor

Frequently Asked Questions

What is the difference between iron ore and steel scrap?

Iron ore is the virgin raw material for blast furnace steelmaking — it is iron oxide mined from the earth, processed, and fed into a blast furnace with coking coal to produce pig iron. Steel scrap is recycled steel, used in electric arc furnaces as a substitute for virgin iron. They serve the same ultimate purpose (providing iron units to make steel) but through entirely different processes.

Why does the US have higher steel prices than the rest of the world?

Primarily because of Section 232 tariffs (25% on steel imports), which limit competition from lower-cost international producers. Domestic US steelmakers set prices reflecting their own cost structure and profitability targets, unconstrained by cheaper global alternatives. US domestic HRC has routinely traded at $200-500/tonne above international seaborne prices.

What is hot-rolled coil and why is it used as a benchmark?

Hot-rolled coil (HRC) is the most widely produced and traded flat steel product. Because it is relatively standardized and produced in large volumes, it serves as the benchmark product for flat steel price discussions. CME Group lists HRC futures (Midwest US delivery) that buyers use for hedging.

How does coking coal differ from the thermal coal used in power stations?

Coking coal (metallurgical coal) has specific coking properties — it softens when heated, fuses, and resolidifies into a strong, porous coke. This structure is necessary to support the iron ore burden in a blast furnace. Thermal coal is burned directly for heat and power and does not have coking properties. They are different products, mined from different coal seams, and priced separately.

Why does China’s property market affect global steel prices?

Chinese construction — including residential buildings, commercial real estate, and infrastructure — accounts for roughly 50% of China’s steel consumption. When China’s property sector slows, Chinese steel demand falls. Excess steel production is exported, flooding international markets and pushing down global prices. Non-Chinese steelmakers then face severe margin pressure.

What are the main shipping vessels for steel products?

Finished steel products move in various ways: heavy structural sections and coil often ship in breakbulk (conventional cargo) vessels or on specialized coil carriers. Iron ore moves in Capesize bulk carriers (180,000+ DWT) on major routes like Australia-China. Semi-finished slabs and billets move in Handymax or Panamax bulk carriers.

Key Takeaways

• Steel is produced via two routes: BF-BOF (iron ore + coking coal, 70% of global output) and EAF (steel scrap, 30% globally, 70% in the US).
• Upstream raw materials for BF-BOF are iron ore (Australia and Brazil dominate seaborne supply) and coking coal (distinct from thermal coal, Australia dominates exports).
• China produces 50-55% of world steel output (~1 billion tonnes/year) and its overcapacity and export volumes set the floor for international prices.
• Key finished products are hot-rolled coil (HRC), cold-rolled coil (CRC), rebar, wire rod, and structural sections — each has its own price and end market.
• CME HRC futures are the primary US steel price benchmark; international prices are assessed by Platts and Fastmarkets; LME steel futures have limited liquidity.
• US Section 232 tariffs (25%, imposed 2018, reinforced 2025) create a persistent premium between US domestic and international steel prices.
• The US is the world’s largest steel importer; China is the world’s largest exporter — the interaction between these two facts shapes global steel trade policy.

Related Reading

To deepen your understanding of the topics covered in this article, explore these related guides: the secondary raw material that feeds a growing share of steel production, the two furnace technologies that define primary versus recycled steelmaking routes and the copper mines whose concentrate contains trace iron units.