How does T10 clay-tempered steel differ from 1045 or 1060 carbon steel in a wakizashi?
Updated Mar 2026
T10 is a high-carbon tool steel with a finer grain structure than 1045 or 1060, and it responds exceptionally well to the clay-tempering process — known as tsuchioki — that creates a visible hamon along the blade's edge. The hamon is the crystalline activity line formed when clay is applied to the spine before quenching, causing the edge to cool faster and harden differently than the body of the blade. On a T10 piece, this line typically shows rich nie and nioi activity under direct light, making it a primary collector focal point. By contrast, 1045 and 1060 blades may display a simulated or faint hamon, but lack the metallurgical depth of a true clay-tempered finish. For display collectors who prioritize visual authenticity over price point alone, T10 clay-tempered wakizashi represent a meaningful upgrade.