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A high manganese steel katana is forged from an exceptionally tough alloy known for its high impact strength and resistance to abrasion. Commonly used in cement mixers, rock crushers, and crawler treads, this steel—often called Hadfield steel—offers incredible durability. With a high carbon content and the ability to be work hardened under stress, it hardens rapidly when struck, making it ideal for functional katanas. Forging this material requires special tooling such as oxy-acetylene, plasma or laser cutting, and diamond or carbide cutting tools. Heated to yellow heat, it’s shaped with care to retain its toughness. Its use in switches and crossings, as well as cutting and grinding tools, reflects its strength and corrosion resistance—traits that make a high manganese steel katana a unique fusion of samurai tradition and modern metallurgy.