How does T10 carbon steel differ from high manganese steel in these pieces?
Updated Mar 2026
T10 is a high-carbon tool steel with a small tungsten addition that improves wear resistance and grain refinement. Its most celebrated collector feature is the ability to develop a genuine hamon - the undulating temper line produced by differential clay-tempering during the heat treatment process. This misty boundary between the hardened edge and softer spine is considered a hallmark of traditional Japanese blade craft and is immediately recognizable to informed collectors. High manganese steel, sometimes called spring steel, is more flexible and takes blade engraving cleanly with crisp, defined lines. It develops a warmer gray patina over time rather than a hamon. The choice between them comes down to what you value in a display piece: visible temper artistry or engraved surface decoration.