this post was submitted on 14 May 2024
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These are the required elements for making steel:
Source: https://www.cliftonsteel.com/education/11elementsfoundinsteel
So, iron is only step 1. Humans are carbon based lifeforms, so I'm guessing that carbon is also sorted, that's step 2.
There's plenty of other elements in the human body, like phosphorus and sulphur, but I'm guessing that it's going to take more than 300 adults.
Source: https://sciencenotes.org/elements-in-the-human-body-and-what-they-do/
Source: https://sciencenotes.org/wp-content/uploads/2019/02/PeriodicTableHumanBody.png
Someone else did the math, accounting for waste made during forging. https://www.wearethemighty.com/mighty-gaming/blood-iron-sword-myth-explored/
This is the MVP-comment! Thank you for that source!