01 Ironmaking
Blast furnace or DRI turns ore + reductant into hot metal or sponge iron.
Acero · El caballo de hierro–carbono de edificios, barcos y raíles, refundido sin fin.
Making Acero is a chain: feedstock, conversion (bloomery c. 1800 BCE / Bessemer 1856), forming, heat, finish, install.
Skip a step and the properties chapter is describing a different object.
Blast furnace or DRI turns ore + reductant into hot metal or sponge iron.
BOF or EAF adjusts carbon, phosphorus and alloys, then vacuum degasses if needed.
Continuous casters freeze slabs, blooms or billets.
Reheat and reduce to plate, strip, sections or rod.
Skin pass, anneal, quench-and-temper or galvanize.
Cut, weld, bolt, form — residual stress and HAZ hardness become the real spec.
Primary ore route; high CO₂ unless CCS or hydrogen later.
Mini-mills recycle steel with electricity; residual copper limits some grades.
Gas or hydrogen reduction plus arc furnace — the green-steel bet.
Cast steels and irons for complex shapes that rolling cannot make.
Feedstock to installed product.
Energy in, class out.
Plain carbon steel rusts unless coated, alloyed or kept dry.
A1 does not mean “safe in a blaze”; protection is a separate layer.
High carbon equivalents crack unless preheat and hydrogen control are real.
Process energy and scrap quality belong in the carbon passport, not in a footnote.
Metal estructural ligero de celdas Hall–Héroult: aviones, latas y fachadas.
Global 59 ✈️Alta resistencia específica y películas tolerantes a cloruros.
Global 58 🔶El primer conductor industrial: cables, intercambiadores, tejados verdes.
Global 57 🍴Películas pasivas de cromo para cocinas, plantas químicas y fachadas.
Global 64