The iron–carbon workhorse of buildings, ships, rails and tools — endlessly recast.
Also called: carbon steel · structural steel · iron–carbon alloy
Steel is one of 32 materials in this atlas, grouped under metals: history, structure, measured properties, process routes, uses, safety and market — not a product catalogue.
Scores compare Steel with the rest of the atlas on strength, heat, fire behaviour, insulation, workability and circularity. They are editorial, not certificates.
Seven chapters follow. Fire and insulation claims name test families (Euroclass, ASTM E84, ISO 5660, KS F) rather than inventing a single safety number.
Deep introduction
Steel (Fe–C (±Mn, Si, Cr…)) is a family of grades whose density 7.85 g/cm³, heat band 1370–1530 °C, and fire letter A1 as construction steel.
Steel is sold as grades, not as a single substance. Chemistry Fe–C (±Mn, Si, Cr…), density 7.85 g/cm³, heat band 1370–1530 °C.
This atlas treats Steel as a system: mill route, coatings, tests and the cavity it sits in.
Conductivity note: ~50 W/m·K. Insulation score 8/100 is relative to 32 entries — metals lose, VIPs and aerogels win.
Fire letter in editorial use: A1 as construction steel. Do not equate A1 with “safe in a blaze” or E with “illegal”. Assemblies decide.
Origin: bloomery c. 1800 BCE / Bessemer 1856, Anatolia → Sheffield. The process chapter follows feedstock → conversion → forming → finish → install.
Uses span construction to packaging. Pairings matter: Concrete.
Producers below are landmarks, not an endorsement ranking. Prices are bands, not live quotes.
Circularity mark 64/100. Ask which scrap, which certificate, which year.
United Kingdom · 1856–
Bessemer converter is a reference point in the public image of Steel.
India / Levant · antiquity
Damascus / Wootz is a reference point in the public image of Steel.
South Korea · 1987–
POSCO Gwangyang is a reference point in the public image of Steel.
United States · 1933–
Cor-Ten weathering is a reference point in the public image of Steel.
Global auto · 1970s–
Dual-phase AHSS is a reference point in the public image of Steel.
Japan · traditional
Tamahagane tatara is a reference point in the public image of Steel.
United Kingdom · 1740–
Sheffield crucible is a reference point in the public image of Steel.
Global · medieval–
Blast furnace is a reference point in the public image of Steel.
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Same family or rival physics — pick a duel.
Closest neighbours on the six atlas axes — strength, heat, fire, insulation, workability and circularity.
Chromium passive films that keep kitchens, chemical plant and façades from rusting like carbon steel.
Overall 64 🥫Light structural metal from Hall–Héroult cells — aircraft skins, cans and façades.
Overall 59 ✈️High specific strength and chloride-tolerant films — airframes, implants and seawater.
Overall 58 🏗️The hydraulic ceramic of cities — cement, water, rock and usually steel, with a fire story better than exposed steel.
Overall 57Light structural metal from Hall–Héroult cells — aircraft skins, cans and façades.
Overall 59 ✈️High specific strength and chloride-tolerant films — airframes, implants and seawater.
Overall 58 🔶The first industrial conductor — wiring, heat exchangers, roofs that go green.
Overall 57 🍴Chromium passive films that keep kitchens, chemical plant and façades from rusting like carbon steel.
Overall 64