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Roman “steel” used in armor was case hardened iron ( packing organic plant materials in with the the iron when beat into plates). If you want to call that steel then fine. But IMO it really wasn’t steel in the modern sense of the material.

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"Roman “steel” used in armor was case hardened iron ( packing organic plant materials in with the the iron when beat into plates). If you want to call that steel then fine."

I call Roman "steel" an alloy of iron and carbon, which is the definition of steel.