Crucible Industries (Exclusive for Spyderco) / USA

SPY27

Powder Metallurgy Stainless Steel58–61 HRCCrucible Particle Metallurgy (CPM)

Composition

Core alloying elements define the baseline trade-off between wear resistance, corrosion behavior, and toughness.

Material Overview

CPM-SPY27 is a proprietary stainless steel developed by Crucible Industries in collaboration with Spyderco. It is designed to provide a balanced performance profile, combining solid edge retention, good toughness, and high corrosion resistance. Its fine powder metallurgy structure ensures consistent carbide distribution, making it easy to sharpen and maintain while still delivering reliable cutting performance for everyday use.

Performance Radar

Use four core metrics to understand the usable operating envelope of this steel at a glance.

Edge Retention

Toughness

Corrosion Resistance

Sharpenability

Edge Retention

8.0

Toughness

8.0

Corrosion Resistance

9.0

Sharpenability

8.0

Advantages

Balanced all-around performance
Good corrosion resistance
Easy to sharpen compared to ultra-hard steels
Reliable edge stability
Optimized for EDC usage

Disadvantages

Not as high in edge retention as M390-class steels
Limited availability (Spyderco exclusive steel)
Mid-tier wear resistance compared to ultra-premium PM steels

At A Glance

CPM-SPY27 is a Spyderco-exclusive powder metallurgy stainless steel offering balanced performance, good edge retention, strong corrosion resistance, and easy maintenance.