ZDP-189

ZDP-189

Hyper Carbon Stainless

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.

Sharpness10/10
Edge Retention10/10
Ease of Sharpening3/10
Rust Resistance9/10
carbon3.00%chromium20.00%tungsten0.60%molybdenum1.30%vanadium0.10%
Hardness67–69 HRC HRC
Heat TreatmentExtremely demanding — requires vacuum or inert-atmosphere furnace
Primary UseUltra-premium chef's knives, specialist blades
ManufacturerHitachi Metals (now Proterial)

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