Steel

Overview

Steel is an alloy of iron and carbon, usually with small additions of other elements to adjust strength, hardness or corrosion resistance, and it remains the most-used metal on earth by a wide margin. Global crude steel production reached roughly 1.85 billion tonnes in 2025, according to the World Steel Association, dwarfing every other industrial metal in sheer volume — a scale that makes steel demand one of the most closely watched proxies for broader industrial and construction activity worldwide.

That scale also means steel's raw material chain, starting with iron ore, carries outsized weight in global commodity markets. Iron ore is steel's single largest cost input, which is why iron ore benchmark prices — like those set monthly by major miners — flow through fairly directly into steelmakers' production costs and, eventually, into the price of everything from rebar to car bodies.

How Steel Is Made

There are two dominant production routes. The traditional integrated route smelts iron ore in a blast furnace to produce molten pig iron, which is then refined into steel in a basic oxygen furnace (BOF) — a process well suited to large-scale, continuous production but heavily reliant on iron ore and coking coal as inputs. The alternative route, electric arc furnace (EAF) steelmaking, melts scrap steel (or, increasingly, direct-reduced iron) using electricity rather than starting from raw ore, making it less iron-ore-intensive and, when powered by cleaner electricity, significantly lower in carbon emissions.

The balance between these two routes varies enormously by country: China and India, the world's two largest steel producers, still rely heavily on blast-furnace production, while regions with abundant scrap supply and cheaper electricity, such as parts of the United States and Europe, lean more on EAF steelmaking. That split matters for iron ore demand specifically, since EAF-heavy steel industries need far less of it than blast-furnace-heavy ones.

Market Dynamics

Steel demand tracks construction and infrastructure spending more closely than almost any other industrial metal, which makes it unusually sensitive to government capital budgets, property-sector health and, in major producing economies like China, industrial policy decisions. Because steelmaking is capital-intensive with high fixed costs, producers often keep running even when margins compress, which can lead to periods of oversupply and price weakness that ripple back up the chain into weaker demand — and therefore weaker pricing power — for iron ore miners.

Key Metals & Materials Used

Iron ore is steel's dominant raw material by weight, smelted alongside coking coal in the blast-furnace route, or steel scrap serves the same feedstock role in electric arc furnaces. Beyond these bulk inputs, a range of alloying elements get added in comparatively tiny quantities to change steel's properties dramatically: molybdenum boosts strength, hardness and corrosion resistance in high-performance grades used for pipelines and tooling; chromium, typically above 10.5% by weight, is what turns ordinary steel into stainless steel by forming a self-healing protective oxide layer; manganese improves strength and workability in nearly every commercial steel grade; and nickel and vanadium show up in smaller specialty applications demanding extra toughness or heat resistance. None of these alloying metals individually rivals iron ore in volume, but their presence is what separates a basic structural beam from a surgical instrument or a jet-engine component.

Byproducts & Waste Streams

Blast-furnace steelmaking produces slag as its largest byproduct by volume — a glassy, rock-like material formed from the impurities separated out of molten iron — which the construction industry has learned to put to good use as an input for cement and road base rather than treating it as waste. Flue dust and mill scale, generated during smelting and hot-rolling, contain recoverable iron and are often recycled back into the production process. The industry's most consequential output, though, is carbon dioxide: blast-furnace steelmaking is one of the largest single industrial sources of CO2 emissions worldwide, which is a major reason electric arc furnace production — powered by electricity and largely fed by scrap rather than ore — is increasingly favored where cleaner power and enough scrap supply are available.

Who It Serves

Construction is steel's largest end market by a wide margin, consuming rebar, structural beams and sheet for buildings, bridges and infrastructure of every kind. Automotive manufacturers are the next major buyer, using steel for vehicle bodies, chassis components and structural reinforcement, even as automakers experiment with aluminium and composites to cut weight. Machinery and equipment manufacturers rely on steel for everything from agricultural equipment to industrial tooling, appliance makers use sheet steel for washing machines and refrigerators, and packaging producers use thin tin-plated steel for cans. Shipbuilders and energy-infrastructure builders, including pipeline and wind-tower manufacturers, round out a customer base that touches almost every corner of the physical economy.

Role in Everyday Life

Steel is easy to overlook precisely because it's everywhere: the frame of the car in the driveway, the beams inside an office building, the blade of a kitchen knife, the can holding tomatoes on a grocery shelf, the rebar buried inside a sidewalk. Unlike gold or silver, nobody buys steel to look at it — its entire value comes from doing structural or functional work quietly and reliably, often for decades, without anyone thinking about the metal itself. That sheer ubiquity is exactly why global steel output is treated as a rough proxy for how much a country or the world is actually building at any given time, and why steel demand tends to track economic activity more closely than almost any other metal.