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the claim

Traditional katanas are made of steel folded one thousand times.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
2 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that traditional katanas are made of steel folded one thousand times?

Yes. Traditional Japanese katanas are indeed manufactured using a labor-intensive process of repeatedly forging and folding tamahagane steel to refine its microstructure and manage carbon distribution.

Verdict: SUPPORTED · 2 sources for, 0 against · Last checked

The analysis

The retrieved papers consistently confirm that traditional Japanese katanas (nihonto) are produced using tamahagane steel subjected to repeated forge-fold cycles. Papers [7] and [8] specifically analyze the microstructural evolution during these successive folding and forging operations, validating the traditional manufacturing technique described in the claim.

Evidence for · 2
Microstructural Observation on Materials of the Japanese Sword under Fold-Forging Process
2010
The study investigates the microstructural development of Japanese swords under the traditional forge-fold operation using tamahagane steel.
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Takami, G., Ohba, T., Morito, S., & Das, A. (2010). Microstructural Observation on Materials of the Japanese Sword under Fold-Forging Process. doi.org. https://doi.org/10.4028/www.scientific.net/MSF.654-656.134

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More for · 1
Traditional Japanese Sword Making from a Tatara Ingot As Estimated from Microstructural Examination
2004
The research confirms that traditional Japanese sword-making involves repeated cycles of forging and folding to homogenize the heterogeneous tatara ingot.
Get citation
Park, J. (2004). Traditional Japanese Sword Making from a Tatara Ingot As Estimated from Microstructural Examination. doi.org. https://doi.org/10.2355/ISIJINTERNATIONAL.44.1040

Receipt History
first checked31 Jul 2026
judged → SUPPORTED · 8131 Jul 2026
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