How does T10 clay-tempered steel differ from 1065 carbon steel in a wakizashi?
Updated Mar 2026
T10 tool steel contains a small amount of tungsten, which tightens the grain structure and increases wear resistance compared to plain high-carbon steel. When clay tempered, T10 produces a visible hamon - the wavy temper line along the blade edge - that is considered a mark of authentic craftsmanship rather than a cosmetic etch. 1065 carbon steel is a simpler mono-steel that tempers more uniformly, resulting in consistent hardness throughout the blade and a cleaner, less patterned aesthetic. Collectors who prioritize visual complexity and traditional metallurgical process tend to favor T10 clay-tempered pieces; those who prefer a restrained, classic look often prefer 1065.