Steel is one of the more volatile industrial commodities, and the price you are quoted on a Tuesday can be meaningfully different by the following Monday. That volatility is not arbitrary. It comes from a reasonably small set of inputs, and once you can see them, a moving market becomes easier to read and easier to plan around.
It Starts With Two Different Cost Stacks
Steel is made by two dominant routes, and they do not respond to the same pressures.
The blast furnace and basic oxygen route takes iron ore and coking coal and turns them into liquid steel. Its cost base is dominated by those two raw materials and by the coke and sinter processes that prepare them.
The electric arc furnace route melts scrap, sometimes supplemented with direct reduced iron or hot briquetted iron. Its cost base is dominated by scrap and by electricity.
So a rise in iron ore moves integrated producers; a rise in scrap or power prices moves EAF producers. In a region where both routes compete, the marginal producer tends to set the price, which is why scrap can lead a market that is mostly blast furnace supplied, and vice versa.
The Main Inputs
- Iron ore and coking coal — the base of the integrated route, both traded globally and both sensitive to Chinese demand and to supply disruption in Australia and Brazil.
- Scrap — the base of the EAF route. Regional rather than truly global, because collection and freight economics limit how far it travels.
- Energy — electricity for EAFs, gas for reheating and for DRI. European energy prices have been a first-order driver of steel costs since 2021.
- Alloys and consumables — ferro alloys, graphite electrodes, refractories. Individually small, but capable of moving sharply.
- Freight — bulk and container rates, plus the cost of the inland leg at both ends.
- Currency — most internationally traded steel is priced in US dollars. For a sterling or euro buyer, the exchange rate can move the landed cost as much as the steel price does.
Demand, and the Shape of the Year
Construction, automotive and manufacturing demand set the direction over months rather than days. Construction demand is seasonal in northern markets, and that seasonality shows up in long products more than flats.
Stock cycles amplify it. When buyers believe prices are rising they buy ahead, which lifts apparent demand above real consumption; when they believe prices are falling they destock, and apparent demand drops below real consumption. A good deal of short-term volatility is this effect rather than any change in what is actually being built.
Policy and Trade Measures
Trade policy is a genuine price input, not a footnote. Tariffs, safeguard quotas, anti-dumping and countervailing duties all change the landed cost of material from a given origin, and can change it overnight.
Carbon policy now does the same thing. The EU’s Carbon Border Adjustment Mechanism entered its definitive phase in January 2026 and the UK introduces its own version in January 2027, which means the emissions intensity of a given mill starts to carry a cost at the border.
The practical effect is that two mills quoting the same figure ex works can land at materially different costs depending on origin, and that the gap moves when policy moves.
Reading the Indices
Several agencies publish steel price assessments, and they are not measuring the same thing.
- Platts, Argus and Fastmarkets publish assessed prices based on surveyed transactions. Each assessment specifies a product, a grade, a basis and a delivery point — for example hot rolled coil, FOB a particular region, or delivered into a particular market.
- The LME lists steel derivative contracts, including scrap and rebar, which settle against published index values and allow price risk to be hedged financially rather than physically.
The specification attached to an assessment is what makes it comparable. A FOB number at a producing region and a delivered number in a consuming market can differ by a wide margin and both be correct, because freight, duty, financing and local availability sit between them.
Why Two Quotes Differ
When two prices for apparently the same product look very different, the explanation is usually in one of these:
- A different Incoterm, so a different set of costs is inside the number.
- A different origin, and therefore a different duty, quota or carbon position.
- A different rolling date. Material for prompt delivery and material from a rolling three months out are not the same product commercially.
- A different quantity, since price per tonne moves with parcel size.
- A different specification — tolerance, certification level, test requirements, packing.
The Short Version
Steel prices move because raw materials, energy, freight, currency, demand and policy all move, and they do not move together. An index number is a reference point with a specific basis attached, not a price you can buy at.
If you want to understand what is driving a number you have been quoted, or how a delivered cost is built up, get in touch.
This article is general explanation, not investment or financial advice.
Related reading: the cost stack behind a price starts with how steel is made, and buyers who want to manage that volatility financially use steel derivatives.