Freeman also said that I think the main advantage of S45VN is the increased corrosion resistance. You can read more about how powder metallurgy works and its history in this article. However, in testing of that steel Chris Reeve Knives wanted more wear resistance to better differentiate from BG42, leading to an increase in vanadium up to the final 4%. Design of S45VN Steel â Nitrogen. Vanadium carbides are classified as the hardest carbides, hence the incorporation of V in the name of the metals. From an experiment where the two steels were subjected to heat 1950 °F, the results after 24 and 48 hours respectively showed that S45VN was better to withstand corrosion resistance as compared to S35VN.  Pinnow, Kenneth, William Stasko, and John Hauser. I wonât say equivalent but close, CPM 154 is close to the S30V in the balance between hardness, corrosion resistance, wear resistance, and toughness, but still the S30V is better in edge retention and corrosion resistance, the second equivalent for our CPM154 would be the 154 CM(since it was developed based on it), and of course CPM â¦ My question now is, why would I chose S45VN over M390? “Corrosion resistant, high vanadium, powder metallurgy tool steel articles with improved metal to metal wear resistance and a method for producing the same.” U.S. Patent 5,679,908, issued October 21, 1997. Therefore, having only vanadium carbides means a better wear resistance-toughness balance. 5 out of 5 stars (1) 1 product ratings - Spyderco Jerry Brouwer CPM-S30V Green G-10 (Newest CQI Version) C232GTIP. The S30V sample I tested was austenitized at 2000°F and tempered at 500°F. Enter your email address to subscribe to this blog and receive notifications of new posts by email. And the exact same programming. Custom knifemaker Jeff Freeman mentioned, that machining and cutting S45VN steel for blades, "For processing, I use the same tools (solid carbide) with the same coolant and fixturing. I think this is due to the supporting material behind the edge. For the maker, it appears to result in longer tool life and possibly increased speeds and feeds with the accompanying decrease in cycle time and machine time. And thanks to Dick Barber for talking to me about the development of S30V. But it does appear that I'm getting a little bit better life out of my cutting tools. However, its corrosion resistance was not the very best hence the advancement to S35VN. I run the pre-sharpened edge thickness a bit higher than most at around .040". I've seen it in processing and in the finished product. If it costs the same as S30V/S35VN I could see a use for it, if its 10-20% more expensive, than we're in the price range of 20CV/M390. 3. The increase in Mo from 1% in S90V up to 2% in S30V provided an increase in corrosion resistance with the relatively low 14% Cr. $237.95. This is in reference to surface grinding water jet cut blanks to final thickness. It's good stuff and I have, make and use S30V blades and haven't had big problems with chipping, but I don't chop cinder blocks either. CPM S35VN hasn't been around all that long -- it originated in 2009 as Crucible Industries' attempt to improve on their previous top steel, CPM S30V. Your vote has been cast. And of course, this varies along the edge from machined peak to valley. With my own CATRA experiments the relative position of S30V is approximately the same, but I will be talking about those experiments in a future article. The CPM process used enhances the production standardized, high-quality steel with superior dimensional solidity, toughness, and machinability.Comparison Between S45VN and S35VN, Composition It's about the same edge retention as S30V but with better toughness and corrosion resistance. With increased carbon content and less vanadium, S45VN holds an edge longer as compared to its predecessors. S30V, S35VN, and now S45VN. It was designed in conjunction with knife companies, knifemakers, and heat treaters to learn the properties that they wanted in a knife steel. Seems to be slightly worse at everything, from toughness, wear resistance, to edge retention and corrosion resistance. The toughness of S30V is similar to other stainless steels in its class according to my own toughness experiments, though not record-setting, as seen in our standard toughness test utilizing unnotched 1/4 size charpy specimens: However, I think the toughness of S30V could be further improved with better heat treating, if we use what we learned with heat treating S35VN, S45VN, and SPY27. Honestly, I doubt the average user will be able to tell the diff. Be first to receive news about sales, coupons & new promotions. S35VN, which is the mainstream steel, contains lower components of niobium and lacks nitrogen, which is added to S45VN to increase toughness. Toughness is better than CPM S30V, but slightly less than CPM â¦ SPY27 â 2050°F. The CPM process produces very homogeneous, high quality steel characterized by superior dimensional stability, grindability and toughness compared to steels produced by conventional processes." With poor grindability and little stain resistance it has never been used much outside of individual custom knives. So we can understand more the Steel, letâs see its chemical â¦ The edge retention is â¦ And less chromium carbide means that even though S90V has less chromium, less is tied up in carbides so that the chromium is free in the steel to improve corrosion resistance.