Fillet Knife

One maker I know regularly uses 1095, I don't see any reason it wouldn't work.
Flexibility is a result of geometry rather than hardness, harden it exactly as you normally would, and grind until its as flexible as you want. And do all the grinding after heat treat.
 
As long as the user is willing to properly look after carbon steels, they make fine fillet blades. I have made a couple in 15n20 for a couple friends, and my personal fillet is 1095. They have a bit of patina as expected but no issue with rusting. A few people I knew would not take care of it, so those buddies got AEB-L or CPM154
 
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