it feels weird to us that steel is the alloy and iron is the pure metal, but stuff sold as "steel" is generally purer iron than stuff sold as "iron"
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wrought iron and cast iron are both extremely high-carbon alloys, because lots of carbon ends up in the iron as it's worked (just from the heat source, typically a flame from burning some carbon based fuel) unless you take care to remove it

if you manage the carbon content properly though, a small amount of carbon strengthens iron a lot (where a large amount weakens it)
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