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This One Mistake Changed Metal Forever | Forging a Largest Ninja KATANA Sword From Old Roller Shaft | How to Recycle Steel SHAFT Into Katana

When iron was heated and mixed with carbon, a stronger metal was born. This new material replaced weak blades and changed ancient warfare. Over time, steel became the backbone of tools, machines, and cities. The Industrial Revolution made steel faster and cheaper to produce.
Bridges, railways, and skyscrapers soon rose from this metal. Today, modern civilization stands on steel.
One small mistake changed metal forever!

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