What steel types are used in purple saya katanas?

The collection includes three primary steel types, each offering a distinct character. Damascus steel is built from folded and pattern-welded layers, producing a surface with flowing visual grain that pairs naturally with ornate fittings and lacquered hardwood scabbards. T10 carbon steel is a tool-grade material valued for its fine grain and the crisp, visible hamon it produces during differential hardening - making it a favorite among collectors who prioritize blade aesthetics alongside construction quality. 1090 high-carbon steel offers consistent geometry and reliable hardness, making it the standard foundation for replica-style builds. All three are used in full-tang configurations throughout this collection, meaning the steel runs the full length of the handle beneath the wrapping.

What is a wave hamon and how is it created on these blades?

A hamon is the visible temper line that appears along the edge of a differentially heat-treated blade. On the pieces in this collection, the wave hamon presents as a flowing, undulating line running the length of the edge, created by applying a clay coating to the spine before the hardening process. The clay insulates the spine, causing it to cool more slowly than the edge, which produces contrasting crystalline structures in the steel. On manganese steel, this process yields a hamon with good visual clarity. The wave pattern specifically — known as notare or midare depending on its regularity — has deep roots in classical Japanese blade aesthetics and remains one of the most recognized features collectors look for.

How does manganese steel differ from T10 or 1095?

Updated Mar 2026

Manganese steel (commonly 65Mn) is alloyed with manganese at roughly 0.6-1.2%, which increases its elasticity and resistance to deformation under flexing stress. T10 tool steel carries a higher carbon content and a small tungsten addition, making it harder and more suited to clay-tempering processes that produce a visible hamon. 1095 sits between the two in terms of alloy complexity. For a display collectible, manganese steel's key advantage is its tolerance for surface treatments - deep blue oxidation, colored lacquer, and etched pattern work all adhere well and hold up over time. It is also somewhat more forgiving in handling than a high-hardness T10 blade, which can develop micro-chips if knocked against a hard surface during rotation or cleaning.