D2

Semi-stainless: enough chromium to resist spotting, not enough to be stainless. Big carbides mean long edge life and a coarse, toothy edge.

Typical hardness

58-62 HRC

Edge retention

3/5

Toughness

2/5

Corrosion resistance

2/5

Ease of sharpening

2/5

1-5 is a relative ranking drawn from published composition and hardness, not a lab measurement. Higher is better on every axis, and no steel is a 5 across the board — edge retention and toughness pull against each other.