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by NegativeLatency 816 days ago
Can't find the source I want to share, but my understanding is that it was developed accidentally in multiple places, as it's a matter of accidentally getting the carbon content of the iron correct to make steel. Then you pass down your accidents and people gradually improve on it. It wasn't until relatively recently that we understood the chemistry of what's going on and were able to reliable make different grades of steel.

Found it, this blog is great if you're interested in the history of blacksmithing: https://acoup.blog/tag/blacksmithing/