World of Engineering
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Steel is approximately 99% iron.
The remaining 0.02–2% is carbon, and that tiny fraction is what separates a material that bends from one that can hold up a skyscraper.
More carbon: harder and stronger, but more brittle.
Less carbon: softer and more ductile, but weaker.
The entire history of metallurgy is the story of humans learning to control that 1%.
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