ZDP-189 vs Shirogami #1

A remarkable Hitachi powder-metallurgy stainless steel with an extraordinary 3% carbon content — the highest of any commercial steel. Achieves hardness levels of 67–69 HRC, creating edges of uncanny keenness with stainless properties. Heat treatment demands extreme precision; it is unforgiving and expensive.

Pure high-carbon steel with minimal impurities. Takes a laser-like edge and is easy to sharpen, but more brittle than Aogami. The traditional choice of master woodworkers who demand the finest possible cutting edge and sharpen their tools with religious dedication. Rust forms overnight if neglected.