Crucible steel
I red an article from a Dutch scientist visiting one of the islands (Sulawesi?) and describing that there they were making crucible steel. They used the material for their plows.
I cannot find the article but will look further for it and post it as soon as i find it.
Furthermore there is an article that describes the way of making iron/steel by the Dajaks.
They put a layer of charcoal on the bottom of their furnaces. On this way they add carbon into the bloomery iron and can make a kind of steel.
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