CPM-S35VN

S30V with niobium swapped in for some vanadium: slightly tougher, noticeably easier to sharpen, marginally less edge retention.

Typical hardness

58-61 HRC

Edge retention

3/5

Toughness

4/5

Corrosion resistance

4/5

Ease of sharpening

3/5

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.