What “the material” actually is
Aço 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 Aço as a system: mill route, coatings, tests and the cavity it sits in.
Fatos rápidos
7.85 g/cm³Density
1370–1530 °CMelting
~200 GPaE-modulus
Euroclass A1Fire
Highly recyclableLoop
metalsFamily
Aço 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 Aço 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.
Introdução profunda
Deep dive: Aço
Aço (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.
Heat, fire and insulation
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.
How it is made and used
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.
Market and circularity
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.
Perfil
Resistência
88
Resistência ao calor
72
Desempenho ao fogo
84
Isolamento
8
Trabalhabilidade
80
Circularidade
64
Sete capítulos
Perguntas frequentes
Is steel non-combustible?
As a metal it is Euroclass A1, but it loses yield in fire and usually needs protection for a rated duration.
Aço vs iron?
Aço is iron with controlled carbon (typically <2%) and alloys; cast iron has more carbon and a different solidification path.
Does steel insulate?
No. Thermal conductivity is tens of W/m·K. Insulation is a separate layer (mineral wool, boards, VIP).
Why does steel rust?
Iron oxidises in the presence of water and oxygen. Alloys, zinc, paint or concrete cover slow that.
Is stainless “stainless” forever?
No. Chlorides, crevices and wrong grades pit. 304 vs 316 is a chemistry choice, not a slogan.
Can steel be recycled endlessly?
Magnetically, yes as a family. Copper contamination and coatings constrain some high-spec loops.
What is AHSS?
Advanced high-strength steels (dual-phase, TRIP, martensitic) used to lighten car bodies while keeping crash performance.
Green steel — real or label?
Hydrogen-DRI and high-scrap EAF cut process CO₂. Certificates vary; ask which route and which year.
Ícones
Bessemer converter
United Kingdom · 1856–
Bessemer converter is a reference point in the public image of Aço.
Damascus / Wootz
India / Levant · antiquity
Damascus / Wootz is a reference point in the public image of Aço.
POSCO Gwangyang
South Korea · 1987–
POSCO Gwangyang is a reference point in the public image of Aço.
Cor-Ten weathering
United States · 1933–
Cor-Ten weathering is a reference point in the public image of Aço.
Dual-phase AHSS
Global auto · 1970s–
Dual-phase AHSS is a reference point in the public image of Aço.
Tamahagane tatara
Japan · traditional
Tamahagane tatara is a reference point in the public image of Aço.
Sheffield crucible
United Kingdom · 1740–
Sheffield crucible is a reference point in the public image of Aço.
Blast furnace
Global · medieval–
Blast furnace is a reference point in the public image of Aço.
Ligue ou desligue ícones — cada barra reescala para o líder da sua seleção.
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Confrontos
Mesma família, outras notas — escolha um duelo.
Materiais semelhantes
Vizinhos mais próximos nos seis eixos do atlas.
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Aço inoxidável
Filmes passivos de cromo para cozinhas, química e fachadas.
Geral 64 🥫Alumínio
Metal estrutural leve das cubas Hall–Héroult: aviões, latas, fachadas.
Geral 59 ✈️Titânio
Alta resistência específica e filmes tolerantes a cloretos.
Geral 58 🏗️Concreto
A cerâmica hidráulica das cidades: cimento, água, brita e quase sempre aço.
Geral 57Mais em Metais
🥫
Alumínio
Metal estrutural leve das cubas Hall–Héroult: aviões, latas, fachadas.
Geral 59 ✈️Titânio
Alta resistência específica e filmes tolerantes a cloretos.
Geral 58 🔶Cobre
O primeiro condutor industrial: fios, trocadores, telhados verdes.
Geral 57 🍴Aço inoxidável
Filmes passivos de cromo para cozinhas, química e fachadas.
Geral 64