Materials Data Series · No. 01

Steel: The Material That Built the Modern World

~1.85 billion tonnes a year, more than every other metal combined. Who makes it, what kinds exist, how strong they are, what that tonnage actually looks like, and the race to make it clean. Full-Year 2024–25 (worldsteel) · Compiled June 2026

World crude steel 2024

1,882.6

▼ 1.8% → 1,849 Mt in 2025

China share

53.4%

~1,005 Mt, more than rest of world

India (the riser)

149.6

▲ +10% YoY · now clear #2

Top 10 share

~80%

Steel is geographically concentrated

Where the World's Steel Is Made (2024)

Colour intensity shows each country's share of global production. Hover a country for its figure.

Lower shareHigher share

2024 Crude Steel Production by Country (Mt)

China alone makes more steel than the other nine top producers combined. Orange marks the rising producer (India) against the mature ones.

World Production Trend (Mt)

Output plateaued after the 2021 post-COVID peak. 2025 is the lowest since 2020, mostly a Chinese-construction demand story.

Where Steel Is Used (global demand)

Over half of all steel goes into buildings and infrastructure. Steel demand is, basically, a proxy for construction.

1.85 billion tonnes is impossible to picture. So here it is in real objects.

Each figure below is annual world crude-steel output (~1,850 Mt) divided by the steel/iron mass of a familiar structure. Sources in footer.

59 t

every second

New steel is poured non-stop, about 59 tonnes a second, day and night, all year.

183,000

Eiffel Towers / year

At 10,100 t each, the world makes an Eiffel Tower's worth of steel roughly every 3 minutes.

31,000

Empire State Buildings

Each skyscraper's frame is ~60,000 t of structural steel. We build that ~85 times a day.

~2 billion

cars' worth

At ~0.9 t of steel per car, one year of output could body ~2 billion new vehicles.

Steel vs Every Other Metal (annual world production, Mt)

This is why steel gets its own category. It out-produces aluminium, copper, zinc, lead and nickel combined, many times over. Log-free, just raw tonnage.

The Four Families of Steel

"Steel" isn't one material, it's thousands of alloys of iron + carbon (+ other elements). Carbon content alone changes everything.

① Carbon steels (~90% of all steel). Iron + carbon. More carbon = harder & stronger but more brittle.
• Low / mild (<0.25% C), structural, sheet
• Medium (0.25–0.6% C), axles, gears
• High (>0.6% C), springs, blades

② Alloy steels. Add Cr, Mo, Ni, V for strength, hardenability and heat resistance, e.g. 4140 Cr-Mo.

③ Stainless steels (≥10.5% chromium → self-healing oxide layer). Four sub-types: austenitic (304/316), ferritic (430), martensitic (410), duplex (2205).

④ Tool steels. High carbon + carbide formers (D2, M2, H13). Built for hardness and wear, they make the tools that shape everything else.

Grade Library, Composition & Typical Properties

Typical published datasheet values (ASM / MatWeb), standard tempers. Read carbon % and yield strength together.

Grade	Family	C %	Key alloy	Yield (MPa)	Tensile (MPa)	Elong %	Typical use

The Strength–Ductility Trade-off (every grade plotted)

The classic materials map. Up = stronger, right = more stretch before it breaks. You usually can't have both, except where modern metallurgy cheats (top-right: duplex, auto dual-phase, maraging).

Carbon / HSLA Alloy / Tool Stainless Advanced / auto

Carbon Content → Hardness

The single most important lever in steel. More carbon locks the iron lattice → higher hardness, lower ductility.

Yield Strength by Grade (MPa)

From mild structural steel (250 MPa) to maraging steel (1,900 MPa), a ~7.6× span within "steel."

Steel's share of global CO₂

~11%

≈7% of all greenhouse gases

BF-BOF (coal route)

2.2 t

CO₂ per tonne of steel

EAF (scrap route)

0.3 t

~7× cleaner per tonne

New capacity going EAF

93%

of 2024 announcements

How the World's Steel Is Made (2024)

70% still comes from coal-fired blast furnaces. That single fact is why steel is one of the hardest sectors to decarbonise.

Clean-Route (EAF) Share by Region

The decarbonisation map is lopsided: Italy & the US run mostly on electric scrap-melting; China, 54% of world output, is still 90% coal-based.

Why It Matters

Decarbonising steel isn't optional, at ~11% of global CO₂, fixing steel matters as much as fixing aviation and shipping put together. Two levers dominate: switch the route (coal blast furnace → electric arc furnace fed with scrap or green-hydrogen "DRI"), and get the electricity clean. The catch is geographic: the country that makes more than half the world's steel, China, runs almost entirely on the dirty route, while it owns most of the scrap and capacity needed for the clean one. The next decade of steel is a data story about scrap availability, electricity prices, and hydrogen cost curves.