I need some help with a filet knife

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Aug 21, 2002
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It's been I long time since I've posted anything on knifeforums but a buddy of mine wants me to make him a 12inch (the cutting edge) filet knife. What's the best steel to use? I heard some where that you can put a blue finish on a high carbon blade to make it stand up to rust pretty good but that's all I know. Or would it be better to get some stainless and edge harden it? If stainless is the way to go what type should I use and what's the advantage of using that steel?


Just a side note:
Come October I'm going to the Navy to do nuclear engineering. I get a hella' big sign on bonus and start basic at e-3 and after I get done with my A school (which is only eight to six months depending on what path I take) I get e-4. I was a little miffed when they told me I'd have to take the nuke test when I was only ONE POINT away from getting into the program on my ASVAB alone. I graduated high school last year and I'm ready to start my life. My only concern is that I'm getting in way over my head but I guess I won't know until I try.
 
Originally posted by twynn5586
My only concern is that I'm getting in way over my head but I guess I won't know until I try.
This never goes away regardless of age... :D
 
Where's the cheapest I can find some 440c? I've never done anything out of stainless. From what I've heard, you don't have to edge harden it. If you don't have to and you do can you notice much of an improvement?
 
Grind it, drill it, get most of the scratches out, send it to a professional heat treater with cryo facilities, repolish, fit handle, and sharpen.
 
Perhaps this is a dumb question but is it going to air harden or do I need to quench it? I'd rather do the entire thing myself. I'm wanting to put a hamon on it but i'm not sure how i'm going to if does in fact harden in air.
 
It is not stainless, but I use 1/16" A2 for filet and thin bladed kitchen knives. Hardened at 1760-1780 F and cryoed then triple tempered at 450 F it will be ~HRC 60+ and about twice as tough as 440C. You can bend these blades more than 90 degrees without effect.
They do need more care to protect from rusting.
 
440C requires a non oxygen atmosphere for heat treating, and attains it's greatest edge holding after cryo treating...I don't think it is something that you want to do at home. If you must do it yourself use O1.
 
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