With the extraction of the first piece of iron ore in Green Field, the construction of the steel mill naturally followed.
Refining iron ore into usable steel was not an easy task.
In another universe, humans had started using natural metals since the Stone Age.
However, it was around 5000 B.C. that they learned to smelt copper, while it is said that the Romans were already using iron nails.
But until the twentieth century, before metallurgical science made significant advancements, producing a good piece of steel was mostly a matter of luck.
Take the Bratis Continent for example. Dwarves were often considered masters of forging secrets, but even those hailed as masters had very limited production capabilities.
Just like the Japanese swordsmiths of the past, who might only produce a few pieces throughout the year.