Is the Heat Treat of your new Knife’s Steel at the Apex still good?
- This topic has 8 replies, 3 voices, and was last updated 06/04/2021 at 11:28 am by
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Hello guys! This article on Knife Steel Nerds might explain the main reason for many problems with new knife edges. The heat treat at the blade apex can be ruined by grinding the edges by a manufacturer. Unless you know exactly how a manufacturer profiled/sharpened your new knife, you should reprofile/sharpen your new knife to get the edges down to some good steel that hasn’t had the heat treat at the blade apex ruined. Some people may be damaging the heat treat of their knife edges themselves by using dry grinding. We here don’t have that problem since we use Wicked Edge sharpeners.
This is why I always question the steel first if I am having problems with using and sharpening a blade. I figured out the potential problem myself and did a bad job of trying to explain it. But I was happy when I found this article where Dr. Larrin Thomas explains it very well.
This question is also why I bought some Tsubosan Rockwell steel hardness testing files. So that I can at least be certain that the steel in my knives are in the ballpark of what the manufacturer claims that it is. All comments and suggestions are very welcome.
I’ve included a photo of my newest knife that I love very much! It is a Carothers Performance Knives, DEK1, in D3V steel with Swedge and Penetrator Tip, Cocobolo scales, and Blued Titanium fasteners. I also bought one for both of my sons, but couldn’t afford to get the wood scales for them at the time. But I bought different Micarta scales for them to choose from. My oldest son loves his Black and Red Linen Micarta scales, and my youngest son that has been in the Navy for about 13 or so years now, prefers the OD Green Canvas Micarta scales.
Years ago, I did some knife sharpening as a service for a friend gunsmith shop. There are (were) a few individuals who simply can’t seem to sharpen a particular knife and they resort to letting someone else try. I remember one fellow handing me his hunting knife, which he said had been made from a file by a friend during WWII. He cautioned that the knife might be a “beast” to sharpen. What I found was that the knife was no different or more difficult than any other knife. In fact, when I made passes on my India stone, I could easily feel a short section along the edge which would really “bite” into the stone. Clearly, the maker had overheated a portion of the edge during the grinding process, leaving that section dead soft. I think this is more common in knives which are hardened manually with a torch than in those heated in an oven and held there at temperature in a controlled environment.
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The main focus of this article is manufacturers sharpening new knives by dry grinding and ruining the heat treat at the blades apex. The hardening and heat treat can be excellent on a blade, but dry grinding the blade apex can ruin the heat treat at the apex. There is very little steel at the apex of the cutting edge. The very tip of the edge apex can be in the submicron range.
000Robert, that’s the crux of it right there.
If we had a mission statement here for the Wicked Edge Forum I think it would be:
We are here to help educate W.E. users so they can use or operate their W.E. Sharpeners well, to make their sharpening experiences productive, successful, and enjoyable.
We help by sharing our user experiences with our W.E. sharpeners, our methods, our techniques, and our setups. We sometimes suggest user installed accessories and/or modifications or adapters. This may include using alternative sharpening mediums, if these may help the W.E. users to sharpen their knives more easily and successfully.
Knife edge steel discussion is relative here, too. That I do recognize. Although, in-depth discussion may be better served in the “Blade Forum”.
I’m not discounting the issue of bad knife edge steel due to disruption of heat treatments. I know and agree this issue exists. I’m just trying to emphasize that the difficulties most every W.E. user shares with this forum can be elieviated and overcome with improved W.E. sharpener knowledge, improved sharpening techniques and using compatible sharpening mediums.
I don’t want to suggest that bad edge steel may be a very common problem that new W.E. users are experiencing. This forum is Wicked Edge centric. Only after we try to educate the new W.E. users in how to use their setups properly and well, will we then look beyond that scope for alternate issues at hand that may be causing the user’s sharpening difficulties. I’m afraid if we were to suggest right from the get-go for W.E. users to look first to the edge steel as being compromised that we will be inviting W.E. users to put the blame on or use this as an excuse that their sharpening difficulties or failures are the fault of bad edge steel, instead of them learning how to use their W.E. systems well.
Besides if the edge damage at the very tip of the apex is on a submicron level (which is what 000Robert stated), I’d expect the steel removed during a regular W.E. knife sharpening process, or even just a touchup, should remove that submicron amount of edge damage. I’d imagine this submicron damage, if indeed there was any, would simpy be removed, and probably or possibly go totally unnoticed.
Marc
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