JapaneseSwordsmithing
Why Japanese Swordsmiths Folded Steel So Many Times – Engineering & Metallurgy Explained
Listen here, kid. Japanese swordsmiths folded steel 10–15 times not for show – bad iron ore was full of slag and uneven carbon. Folding hammered out impurities, made stronger, layered blades. Modern steel doesn't need it. Uncle explains the real metallurgy.