Construction
Frames, rebar, decking — still the default skeleton of cities.
Darker cells mean a higher score for this topic on that metric.
Strength88
Heat resistance72
Fire performance84
Insulation8
Workability80
Circularity64
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Quick answers
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.
Steel vs iron?
Steel 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.
heat 72 · fire 84
Steel earns its keep in systems: a beam, a batt, a fibre blend, a coated steel — rarely a lone coupon.
Products below are cultural landmarks as much as SKUs.
Sectors
Transport
Auto bodies, rails, ship plate, containers.
Energy
Towers, pipelines, pressure vessels (with coded alloys).
Tools
Cutters, dies, bearings — often through-hardened or carburised.
Appliances
White goods skins, often galvanized then painted.
Packaging
Tinplate and aerosol cans remain a closed-loop steel stream.
Products
I-beam / H-beam
Hot-rolled sections
Rebar
Ribbed reinforcing bar
Auto AHSS blank
Crash structure
Rail
Pearlitic head-hardened
Ship plate
TMCP hull
API pipe
Linepipe
Tinplate can
Food pack
Bearing steel
52100 / 100Cr6
Pairings
Concrete
Rebar composite: steel takes tension, concrete takes compression and fire cover.
Zinc
Galvanizing sacrifices itself so the iron does not.
Intumescent coats
Buy fire resistance without bulky boards on exposed architecture.
CFRP patches
Bonded carbon plates strengthen bridges when welding is unwelcome.
If the pairing is wrong, the material will be blamed for a system fault.
Keep exploring
More in Metals
🥫
Aluminium
Light structural metal from Hall–Héroult cells — aircraft skins, cans and façades.
Overall 59 ✈️Titanium
High specific strength and chloride-tolerant films — airframes, implants and seawater.
Overall 58 🔶Copper
The first industrial conductor — wiring, heat exchangers, roofs that go green.
Overall 57 🍴Stainless steel
Chromium passive films that keep kitchens, chemical plant and façades from rusting like carbon steel.
Overall 64