We all know anyone who is deeply interested in knives wants to learn more about what materials are used for them be it handle or blade or sheath. I started a handful of years ago with a basic Gerber china special. I started looking up EDC tags on Instagram and checked out some knives I thought looked nice which opened my world of knives to Spyderco.
From grade 1 (Gerber) to High School in a few minutes of research. Of course the first offering I got was the Tenacious as most people do. I loved it, the build quality, the feel in hand, everything so I decided they were worth the money and went and got my first Paramilitary 2, satin/digicamo - then satin/black - then S35VN - then M390, the King and the only one I still have left. Now these happened over a span of about 4 years as I really enjoy the carry, usability and style of the PM2.
It was my learning and then real world testing of these different steels that got me deeper in that rabbit hole. True there are a lot of guys who don't give a crap about steel etc. and just carry a china folder for the odds and ends and that's just fine for them, more power to them. I want it all in one, edge retention, toughness and rust resistance - the big three. I couldn't fathom taking my knife out and have a rusty blade like an old fisherman's tackle box utility knife.
I've been dabbling with budget folders recently so I've been sacrificing the big three to an extent. Usually I find the budget folders with 8Cr13MoV lose a razors edge within the first few cuts so you may have a slightly dulled knife before you know it. Now on the high end of the scale, M390 is a super steel and lives up to that rank with amazing edge retention. Other high edge retention steels include CPM M4, CPM 3V, CPM20CV, CTS-20CP.
Toughness comes mid range to the budget steels I find, always depending but for D2 I find in certain situations it can cause small chipping which can also happen to extremely high Rockwell rated knives like ZDP-189. CPM S30V has a good toughness and would roll over chip if stressed. CPM S110V is very tough but also tends to roll under use.
Budget steel also is not known for rust resistance and can often form even within your pocket with moisture and heat from your body. Now on the high end there of course is M390 which resists rust superbly. On the other hand there are steels like M4, 3V and other high carbon steels which are not rust resistant can cause problems if not maintained after use. If you can maintain that non stainless knife it'll treat you very well.
A lot of what I write is from first hand experiences and knowing full well they can change from user to user. These few paragraphs are just my opinions and findings, take it all lightly as I'm not trying to tread on anyone else.
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