What makes T10 steel a preferred choice for hamon display?
Updated Mar 2026
T10 is a high-carbon tool steel with a carbon content of approximately 0.95–1.05%, combined with trace amounts of tungsten that improve edge retention and grain stability. When clay-tempered and quenched, T10 produces a hamon with exceptional visual clarity — the boundary between the hardened edge zone and the softer spine tends to be well-defined and rich in activity (the small crystalline formations known as nie and nioi). Lower-carbon steels or stainless alloys either cannot form a true hamon or produce one that is far less pronounced. For collectors who prioritize the temper line as an aesthetic focal point, T10 consistently delivers a more rewarding result than most comparable steels at this level.