How Japanese Swords are made - slice a bullet in half!

Moment at 0:00 in How Japanese Masters Turn Sand Into Swords by Veritasium.

How Japanese Masters Turn Sand Into Swords

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• How Japanese Swords are made - slice a bullet in half!
• The method of making these swords
• 105 Million for ONE SWORD
• Shimane - One Night Each year!
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• Bronze Before Steel - bends easy!
• Steel is an alloy of Iron
• Japan - Has very little iron - why late to Steel Production
• Iron accumulates where direction changes
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• Soft Iron + Charcoal = awesomeness
• Carbon + Iron = Steel
• Iron Sand + water --> too much water = explosion
• 250kg charcool & 60 kg Iron sand
• 614 kg iron sand and 670 kg charcool in smelter
• Crane --> smelter --> 100 kg block, 1/3 cn be used for swords
• Steel sorted by carbon content - sent to swordsmiths
• forge Sword
• Why fold and hammer the steel so much?
• Some sword with over 1 billion layers - wtf?
• Different Carbon Percentages Used In different parts of the blade
• Edge is High Carbon Steel
• Clay Layer added, rapidly cooled - quenching
• When steel is heated...
• Combination of Ferrite Steel & Cementite = Perlite
• Thin Layer cools rapidly - lattice structure changes - MARTENSITE!
• How Samurai Swords get their Iconic Curve - Martensite!
• Polisher and Sharpening - Can take a month to polish / sharpen!

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