What makes T10 steel a preferred choice for collectible wakizashi?
Updated Mar 2026
T10 is a high-carbon tool steel with approximately 1.0% carbon content and trace tungsten, giving it a fine grain structure that responds exceptionally well to clay tempering. When smiths apply clay to the spine before quenching, the edge cools faster than the spine, creating a hardened edge and a visible hamon line. On T10, this hamon presents with natural clarity and variation that collectors can examine like a fingerprint - no two blades produce the same temper pattern. This makes T10 wakizashi a more compelling display piece than blades made from uniform stainless steel, which cannot develop a genuine hamon through heat treatment.