The katana 's famous curvature is not just a matter of style: it's the result of engineering that's as elegant as it is effective. During forging, the master smith applies a thinner layer of clay to the cutting edge than to the back of the blade. During tempering, the cutting edge cools faster, creating a harder structure (martensite), while the back remains softer. This thermal shock causes internal tension... and gives rise to the sword's natural curvature. The result is a perfect balance between cutting power, strength and flexibility.
The katana thus becomes a living weapon, born of fire and intelligence, as deadly as it is harmonious.
From the Forge to Your Hand: Handcrafted Katanas and Exceptional Swords
Samurai & Katana | Middle Ages & Swords | Templar | Legend & Cinema 
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