How does T10 clay tempered steel differ from manganese steel in these tantos?
Updated Mar 2026
T10 tool steel and manganese steel produce noticeably different visual and structural results in a finished tanto. T10 is a high-carbon steel that responds well to clay tempering — a process where a clay mixture is applied to the spine before quenching, creating a differential hardness between the edge and the body. This produces a visible hamon, the undulating temper line running along the blade that is one of the most prized aesthetic features in Japanese blade collecting. Each hamon is unique to that specific quench. Manganese steel, by contrast, offers higher impact toughness and a more uniform, consistent surface finish. It does not produce a natural hamon but accepts polishing and surface treatments — including blue oxide finishes — very cleanly. Collectors who prioritize visual tradition and blade individuality often prefer T10 clay tempered pieces; those who value bold, graphic contrast and surface uniformity may lean toward manganese steel.