These are the required elements for making steel:
- Iron
- Carbon
- Manganese
- Chromium
- Phosphorus
- Sulphur
- Nickel
- Molybdenum
- Titanium
- Copper
- Boron
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
- Your link says these are elements commonly found in steel, not that they are all required. In fact it says of phosphorus and sulphur that they are generally undesirable.
- We don't need to make a steel sword, an iron sword could do.
Either way you would definitely need carbon, but as you say that's pretty easy. I don't think any of the other elements are absolutely required.
Those are all of them, but that's for a lot of different types of steels. You don't have to have all of those metals to make steel. You really just need iron and a tiny bit of carbon. A few of your ingredients help with purity, and the rest are additives for different steel properties you may want. Like a touch of nickel for stainless steel.
I searched for ingredients for making steel. I'm obviously not a metallurgist, nor do I pretend to be one on the internet :)
The meme triggered my interest into discovering just what might be involved.
Clearly I've just scratched the surface ..
