Very useful graph.
I guess it applies to the average Western quality knife steels.
The Japanese kitchen knifes are hardened to a higher degree than ours, and they like to have an edge angle of 12 - 14 degrees.
I have some of those knives, various steels including where the core/edge steel is made from Powder steels.
The result is a scarily sharp edge, and weirdly enough it lasts well. I guess more prone to chipping though.
The Sandviken steel Morakniv uses is also us d by some Japanese knife makers, and they harden to a much higher level than M. does. Higher than Sandviken AB states should be done.
It is a science beyond me.
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