I think forged steel is more corrosion resistant, and it's stronger...less air bubbles. Forged is more solid. Cast steel is more like high carbon steel. Comparing forged steel to cast steel is like comparing pine to plywood. One is carved (forged) from a natural block and one is made from mixing it and basically glueing it together. Forged is stronger and more solid.
I'm not 100% sure. But I think that's the difference.
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