tony281sc2
Gold Member
- Joined
- Feb 13, 2017
- Messages
- 2,373
Thanks for taking the time to get back to me Larrin, as a knife enthusiast I appreciate all you do for the community (and then dumbing it down for folks like me lol). It’s good to hear that it OK to have a Magnacut blade around 61 (for the toughness), since everyone was bashing one of the bigger companies (honestly forgot who) because they tested ONE and it came out around 60… and also thanks for confirming that M390/20CV do NOT need to be that high either, everyone expects to see 61+, when in reality it turns out the Manufacturers DO know what they’re doing all along treating 20CV at ~60.I think anything between about 60-65 Rc can be appropriate for MagnaCut depending on desired properties, the knife, target customers, etc. Hitting 65 Rc consistently is difficult even with custom heat treating, 64-65 is probably a reasonable target if what you want is max hardness custom heat treating. For production heat treating 63-64 Rc is more realistic as a maximum. But I have worked on production heat treatments more in the 62.5-63.5 Rc which is a bit more balanced. 61-ish is a good target for blades that want to favor toughness. But there are certain customers requesting maximum hardness, and it certainly works fine at max hardness. M390 and 20CV have been pushed into the 62+ Rc range in recent years but that steel has relatively low toughness so it is somewhat surprising that this is the steel people have identified as one that “should” be at high hardness. I would argue that S35VN would be a better choice for 62+ Rc than M390.
Thanks again for sharing your knowledge! Always look forward to your posts.