How do PM Steels Break Down? (Stainless vs. Non-Stainless High Alloy)

Hardness and carbides are key indicators of possible edge performance. Steel chemistry and more importantly its heat treatment will dictate how these characteristics are expressed in each knife. Fine edge retention: This is the initial hair popping edge we all love. Hardness is absolutely key for maintaining a fine edge over time. Above 61-62HRc I really start seeing the benefit of the higher hardness in fine edge holding. Working edge retention: This is the less sharp edge that develops as the initial edge breaks down and wears away. The higher the carbide content the longer the working edge will hold. The higher the vanadium carbide that is formed will dictate the quality of the working edge with steels like K390 having an extra nice edge. S30V will keep a notably better working on edge than Cruwear but nothing compared to K390.

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