Been waiting for this one! Interesting. Puts me in mind of one of your previous videos where you plotted your steel choices, drawing correlation in your preference to hardness and carbide content, which seems to still play out here for the most part. As a correlary issue, I know you've talked about magnucut before but would be curious about an update down the road at some point (know you'll be getting magnucut native for sure) maybe comparing to the contemporary cruwear or such depending upon what you have available for comparison would be interesting. Guessing you might have already though about something like that, don't know, but just throwing it out there in any event.
That steel choices plot was well informed so I felt confident with how this would play out! Yeah I'm really waiting for an EDC knife to keep the discussion going on Magnacut. Really I just want the Spyderco Manix LW in it so that's what I'm holding out for. I will be doing a video on my Meglio Gyuto and I'll talk about it in there some but I don't want to fully extrapolate it's performance to EDC. I actually haven't carried Cruwear in a long time so I really should get reacquainted with it regardless!
It's weird. All my 940s had s30v. They were always chippy and dulled quick. The last one I got, in s30v outperforms everything other then my Delica K390. It's like a totally different knife. It must have just been a perfect heat treat batch. I mean wow, I love this specific s30v 940. It's my winter knife being in the Pacific Northwest.
That Spyderco in m390 will last longer in fine edge cutting over s90v. But the Spyderco s90v may have a longer working edge depending on the batch and the rc of both of them. Now when we switch brands and other brands use different protocols and rc's in those different protocols, that's were we start to see differences in performance in the same steels. Is the company doing secondary hardening? Is the company using liquid nitrogen? Is the company doing a low temper or a high temper? Is the company using a higher or lower austenitizing temp? Is the company using a longer or shorter soak time. It all matters more than you think. We've seen some Benchmade s90v do as well as Spyderco after burnt edges removed. But we've also seen s90v from other brands perform poorly too when the company doesn't use secondary hardening.
How would you if the M390 will hold a fine edge longer? Like you said it depends on the heat treat which is batch specific yes but there's a range within that batch. From my mileage I don't see much of a difference between the two as I discussed. Is the chemistry right for secondary hardening in S90V? Larrin's recommended heat treat includes a 400F temper after Cryo. Secondary hardening usually sees tempers more in the 1000F range. In 10V you see similar hardness with a 400F or 1000F temper due to secondary hardening but the toughness is way dropped (50%) on the 1000F so it's not worth the carbide increase. Granted you'd probably be putting more chromium back into solution with the S90V at high temp and freeing up carbon for VC formation but idk if it would totally blow out the toughness and increase hardness enough over V enriched M7C3 carbides.
@@EngineersPerspective701 you dont see a difference between m390 holding a finer edge longer than s90v which holds a fine edge shorter and a working edge forever? I'm glad you are learning from Larrin! He's not the end all of heat treat and keeps things too simple sometimes but has very good advice! Sorry i didn't mean secondary hardening I meant higher austenitizing temp and cryo. The temper range matters too as you've seen from his articles. I must have been mixed up with a different steel at the time of posting. Iirc Spyderco is around 59-62rc for s90v. Same for m390/20cv from the USA factory. Larrins book also mentions most of the steels from spyderco get a plate quench and cryo.
@@tacticalcenter8658 For these examples it's honestly pretty close in both fine and working edge. Both are best in class I've come across for stainless steels I've used. Other than maybe S110V working edge beating these out but I never let any go long enough to know Yeah I think Larrin really focuses on makers being to able to accomplish the heat treat consistently and with ease. The keep it stupid simple principle!
Nothing else to watch on you tube right now so just went back to on of my favorites and rewatched your video 😂. Anyway, a couple thoughts, 1. You mentioned too many chromium carbides maybe holding the s90v back in terms of that sticky edge k390 can take, wondering how you would campare to magnacut in that regard given its focus on avoiding chromium carbides, and also 2. an observation, you said you were not sure why the 940 20cv sharpened quicker than the s90 Native and I'm thinking that besides whatever other factors, you had the 940 reground thinner. Well, hope fatherhood with the new addition is treating you well and look forward to the next knife video.
I do the same when RU-vid's algorithm fails me! 1. I misspoke a little bit. It's not the ratio so much as just the raw VC content. S110V does have enough with about 12-15vol% of VC and S90V does not with about 9vol%. So the cutoff lies somewhere in between but IDK what is exactly and no doubt it depends on the overall chemistry and microstructure. 2. No doubt you're right. Thin bevels make such a big difference. A major reason why I enjoy sharpening kitchen knives so much more than pocket knives!
@@EngineersPerspective701 part of me wonders if it could be melt to melt variation. They should just hire Shawn Houston (Big Brown Bear) full time to supervise and refine their HT protocols.
@@SFBay69 it’s not, they are virtually the same. However, S90V has around 20% more carbon, double the vanadium and 25% less chrome. S90V obviously relies on high levels of vanadium carbide, M390 has much more chromium carbides that are still very hard and give it that edge retention between S30V and S90V levels.
