Homogeneous steel in my opinion, have an uniform structure and composition. So it can correspond to only modern steel, or steel coming from High furnace (cast iron that is heated to lose carbon and make steel).
Japanese sword of extremely good quality, are almost considered homogeneous steel. The bloomed steel, heterogeneous at the origin, is so much folded that it's almost homogeneous.
But, all the blades coming from bloomed steel are forge folded, and considered heterogeneous in composition.
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