RAZOR FINE EDGE RETENTION: m390 and Sandvik 14c28n Conclusion 3 of 3

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Hello, this is the conclusion to my "razor fine edge retention test". In this video i tested the Kershaw Leek and the Benchmade Valet to see which one would hold the "razor fine edge" the longest. Each cut was through 3 inches of cardboard taken from one large box. I cut until the knife couldn't slice paper towel reliably. I assumed the leek would easily defeat the valet because of its razor steel heritage. This video is the summary of the test. I am posting the summary first because the actual test ran very long. I should get around to posting the video of the actual testing in the near future.

Опубликовано:

10 сен 2024

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Комментарии : 3

@jsct6111 6 лет назад

Razor steels are supposed to hold face hair shaving sharpnes, thats quite a bit sharper than just hair shaving on the forearm. Also razors have edge angles about 10 degrees per side. So the razor steels are designed to have properties that will work under upper described conditions. Your test didnt meet that therefore the advantage of the razor steel couldnt be observed. But no need to test edge stabilty with M390 at 20deg inclusive it is just not holding the edge well even at 62HRC due to its high carbide volume. Edge deforms too easily when cutting hemprope. On the other hand I dont consider kershaws ht on this particular 14C28 to reach the edge strength needed for razor which is 61HRC and higher.. But nice to trying to find out something about your tools :)

@jonr9581 6 лет назад

Thanks for watching. And your comment has good info. Yea, high carbide steels don't have the high edge stability that actual razor steels such as 13c26, or aeb-l. However, for for a high carbide steel, m390 has very good edge stability and that is why i was interested to see how it would compare to a fine grain steel which was born from razor steel. "razor sharp" is a phrase that is in common use to describe a sharp edge. In this video i am using "razor sharp" as a simile for a very sharp edge. Likewise, i tried to come up with a title that conveyed the fact that i was testing these steels to a higher sharpness standard than my rope tests. Furthermore, my m390 will actually shave hair off my face pretty easily. But as one would expect from a knife thicker than an actual straight razor, it is not as comfortable. Also, utility blades are described as a razor. But really, i don't see the need to get too technical in a youtube video. haha, i'm not trying to write a physics textbook here.

@jsct6111 6 лет назад

M390 is quite fine relative to its carbide volume yeah but at 30deg most knife steels have a good edge stability anyway. What sharpening angles You used ? Also for these type of test its extremely important that all samples start at the same inittial sharpness and at high sharpness levels it is not possible to reliably determine it just by cutting into things.. Nice video, however its been tested and documented already.