differential hardening

The Katana as Materials Science

2026.05.26

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The person who writes this article

A Japanese mechanical engineer with over 10 years of experience in the precision manufacturing industry.
Passionate about "Monozukuri" — the Japanese art of making things. Through this site, I decode the excellence of Japanese engineering and traditional craftsmanship from a technical perspective, sharing the "why" and "how" behind Japan’s world-class quality with the world.

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