Couple quick 20cv questions

WValtakis

WValtakis

Hand engraving & Titanium anodizing
Knifemaker / Craftsman / Service Provider
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May 29, 2004
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Got a piece of .156" 20cv coming for a buddy's retirement knife, smallish EDC blade. I'm planning on sending it out to Peter's for heat treat, should I grind the bevels before or after (obviously before would be way easier with my current setup but I don't know if 20cv has warping problems). Also, what target hardness should I ask for?

Thanks in advance guys:)
 
20CV is chemically about the same as M390. Peters does my M390 at Rc 60 and it works great. Grind the bevels pre heat treat otherwise you will be burning up belts and grinding forever.
 
Peter's is very good at keeping blades straight for you. I like RC61 for slicers with 20CV. You can take the edge down to 0.015" before HT.
 
Thanks guys, that's great to hear:thumbsup::)
 
I would suggest taking it to 400 grit before HT. Make sure ALL coarser scratches are gone or you will hate yourself.
 
I believe it was Devon Thomas who suggested to my I use some of the 220 grit Silica Carbide belts to clean up coarse scratches post heat treat. It did take a few belts but at least it works!
 
Stacy is absolutely right. Any scratches from 240 grit or coarser will drive you nuts trying to get rid of them post HT. Peters told me .010 was the minimum thickness for HT. .015 might be better.
 
20cv benefits from a full contact plate quench. This poses a problem for high carbide steels, as grinding post heat treat is not the funnest, or economical option.
 
timos- said:
I believe it was Devon Thomas who suggested to my I use some of the 220 grit Silica Carbide belts to clean up coarse scratches post heat treat. It did take a few belts but at least it works!
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Do you have a source to recommend? I’m looking to try some.
 
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