I have been wanting to see a steel like this made for some time, and it is great to see how it performs. And it gives everyone else a chance to see whether I am any good at predicting properties of steel based on composition. 440C 2.5 ft. lbs. Yojimbo™ 2 Natural G-10 CPM M4 Exclusive. Unfortunately, I am probably unlikely to get flatstock for experiments due to the steel being exclusive to Spyderco. CPM S30V Stainless Steel Precision Ground. So far only two stainless steels have failed this test, XHP and ZDP-189. This new design features a slimmer profile so that it feels better in the closed position. I’m so confused about it since I thought CPM154 is very good at toughness aside from its medium edge retention and corrosion resistance. $216.00. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! Niobium carbides have also been found to help refine the microstructure of steel. After quenching, one third of the specimens were left at room temperature, another third of the specimens were placed in my freezer (a normal household basement variety), and the final third were placed in liquid nitrogen for a cryo treatment. Para Military™ 2 Left Hand G-10 Black. Thanks to A.N. You can see more ratings in the corrosion resistance article I linked to above. I don’t have a good quantitative test for finishing or sharpening and I have not yet performed any edge retention experiments. The carbide structure is explored in the next section. Despite the reduced carbide content of SPY27 the toughness was similar to S35VN. How is it related to MAXAMET ?vObviously I understand it is not as hard but what about the overall quality? The steel has the same Cr and Mo content as S30V and S35VN. Experimental results of SPY27 line up well with the previously provided predictions. Condition is Used. Native® 5 FRN CPM® SPY27™ ... Para Military™ 2 G-10 Dark Blue CPM S110V. I am looking forward to seeing how this steel compares to others once we get some real-world feedback from users. In the article on S45VN, I found that austenitizing at 2000°F led to a finer microstructure than 1950°F. from $34.87. The carbon content is of SPY27 is balanced to result in a similar hardness to S35VN, S30V, and S45VN, as indicated by carbon in solution estimates from Thermo-Calc: Therefore we would expect the steel to reach a similar hardness to those other CPM stainless steels. Contrary to some information available out there, cobalt does not improve toughness or corrosion resistance. Para Military™ 2 G-10 Dark Gray Maxamet. $329.95. In the article on cobalt additions I wrote, I noted that cobalt additions to high speed steels have been known to reduce toughness which may mean that even if the toughness was improved due to reduced carbide, it may be that the cobalt addition reduced toughness back down to the level of S35VN. spyderco para 3 lightweight Cpm Spy27. Sale Price: $122.50. The CPM154 was marked at the point somewhere around 20 ft-lbs in your previous chart but now at 5-10 ft-lbs only? S35VN had a somewhat reduced vanadium content (3%) in combination with 0.5% niobium. Your email address will not be published. It sharpens easier and is cheaper while still having a pretty great edge retention. Required fields are marked *. Free shipping . Enter your email address to subscribe to this blog and receive notifications of new posts by email. 36 . I estimated edge retention for a hardness of 61 Rc. Employ especially on knives, its abilities to retain edge sharpness and resist rust are superb. Some more information on nitrogen additions to these types of PM stainless steels can be found in this article on S45VN. CPM SPY27 is a steel produced by Crucible exclusively for Spyderco. Had a couple scratches on blade and a couple on handle. I'm curious about that Spy27 steel and the Rex45! OUT OF STOCK. It may be that the reduced carbon content when compared with S35VN leads to superior toughness. I may have to do some more corrosion testing and modify the ratings. 18 . Thank you for the article Larrin. The Sebenza 21. I have an article about SPY27 which I wrote immediately after the announcement of the steel. This is a lucky opportunity since it gives me the chance to see what the properties of the steel really are. Enter your email address to subscribe to this blog and receive notifications of new posts by email. I compared the toughness results with S30V, S35VN, and S45VN. The CPM S30V (Which is an acronym for Crucible Particle Metallurgy) is a quality, high endurance steel of American origin. I performed two heat treatments with SPY27, one austenitizing at 1950°F and another at 2050°F. Thanks to ShavedAlpaca, giorgi chubinidze, and Сергей Якунин for becoming Knife Steel Nerds Patreon supporters! Yojimbo™ 2 Carbon Fiber CPM 20CV Exclusive. 2.8% of Carbon: It improves hardness and wear/corrosion resistance, but a high amount of it decreases strength. SPY27 – 2050°F. CPM S30V 10.0 ft. lbs. $269.95. $104.95. I then tempered specimens twice for two hours each time at 300, 400, and 600°F and plotted out the resulting hardness. Para Military™ 2 G-10 Digital Camo/Black Blade. I then refinished them and started the 1% saltwater test which was 48 hours long. Manix 2 Lightweight CPM SPY27. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition. $236.00. [1] https://catalog.spyderco.com/Reveal4/?page=10, [2] https://forum.spyderco.com/viewtopic.php?f=2&t=85769, [3] https://www.spyderco.com/edge-u-cation/steel-chart/. In the previous SPY27 article I said, “I would expect SPY27 to have toughness at least as good as S35VN and probably better, but that would have to be confirmed experimentally.” I tested toughness by austenitizing the steel at 2000 or 2050°F and then tempering at 400°F. In general, lower carbide volume means higher toughness. And sharpening is probably a bit easier to S35VN. Spyderco: Native 5 Lightweight - Cobalt Blue FRN - Lockback - CPM-SPY27 - C41PCBL5. I got a question about the toughness of CPM154 in your chart. It's a rare occurrence that we need that level of performance. https://www.patreon.com/Knifesteelnerds, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). CPM S30V Stainless Steel Blanchard Ground. Below shows heat treatments using liquid nitrogen with S35VN which resulted in relatively similar hardness to the experiments with SPY27 shown above: In the previous SPY27 article I predicted that it would have “similar corrosion resistance to S30V and S35VN.” I used my previously described corrosion resistance test of SPY27 along with S30V and 420HC. Do a through test on 420 hc buck basic cryo hardened steel at there treatment level …corrosion,hardness .edge retention .most people need 420hc cryo because average people can’t sharpen good thanks, Your email address will not be published. This provides the steel good flexibility, offering easy heat treatment to 60 Rc with commercial heat treating and also higher levels if desired. I would argue that S30V is better for every practical need. At that point very little information was available about the steel other than the composition and that it was produced by Crucible steel. The SPY refers to Spyderco and 27 is the atomic number of cobalt [2]. The steel is capable of relatively high hardness, reaching over 65 Rc “as-quenched” before tempering, and nearly 64 Rc even without a cold treatment. 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. ; 15.25% of Chromium: For tensile strength and Edge retention, and enhances corrosion resistance and wear resistance. $265.00. Update 3/10/2020: We did a range of experiments with SPY27 to supplement the estimates in this article. Notify me of follow-up comments by email. For a while CPM-S30V was the top of the line steel. The toughness is probably a bit better than S35VN. Metallurgy and Testing of Knives and Steel. CPM is a trademarked name for a process that is also called Powdered Metallurgy or PM steel. Both S30V and S35VN steel are made with the same carbon and chrome content, and from various tests, both steels provide the same edge retention and corrosion resistance. I have shown the 2050°F specimen below, along with comparisons with S30V, S35VN, and S45VN where you can see that SPY27 has somewhat less carbide than the others. It is always interesting to see what the numbers predict and it will be cool to see how they play out once you get some to do some real in hand testing. This change led to a finer carbide structure and better toughness and machinability than S30V at the cost of a small reduction in edge retention. I heat treated coupons of SPY27 by wrapping the steel in stainless foil to protect against scale and decarburization. The Nb content was bumped up to 1% from the 0.5% of S35VN and S45VN which will of course increase the amount of niobium carbide. The purified water is to test if the steel is acting as a stainless. The composition [3] is as follows: I don’t have any of the steel for analysis, and given it is exclusive to Spyderco I may not be able to get any. Quick View Thickness. The edge retention of SPY27 is expected to be a bit below S35VN, similar to Super Gold 2, though higher than steels like VG10, 440C, and CPM-154. I will be happy with edge performance anywhere in the S30V/Elmax range. The composition of the steel along with some other in the same class are shown below. Based on the predicted alloy in solution for SPY27 it should have similar corrosion resistance to S30V and S35VN. $310.00. I will be posting results as they come in to Patreon and articles summarizing the tests will come later to this website. The 1% niobium content may help refine the overall carbide structure when compared with 0% or 0.5% Nb PM stainless steels. Notify me of follow-up comments by email. However, as seen in the micrograph the “carbide clusters” in SPY27 are similar in size to the other steels. Crucible seems to be coming out with more steels lately. You can read those experiments here. The steel is reportedly exclusive to Spyderco. REX 45 will have better edge retention but less corrosion resistance. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! The edge retention is likely a small step down from S35VN. $168.06. Your email address will not be published. CPM, makes the steel stronger than the SAME steel made using a conventional steel manufacturing process. Here’s what Buck Knives says about S30V: “We consider this the absolute best blade steel available, and it is made in America.” To see how common the clusters of carbides are I have a lower magnification image of SPY27 below: I also gave some estimates of edge retention, finishing, and sharpening of SPY27. Required fields are marked *. CPM-S30V has become one of the most used premium steels on the market among knife manufacturers. There are a couple studies that found a cobalt addition leading to slightly worse corrosion resistance but I’m not sure if this SPY27 study is conclusive enough to confirm that. $151.25. The resulting steel is expected to have similar hardness and corrosion resistance to S30V and S35VN. $217.95. However, you can still see my predictions in that previous article. You can read more about this in the article on S35VN. Maxamet is a non-stainless high speed steel capable of high hardness. I austenitized the steel at different temperatures for 20 minutes and quenched between two 1″ aluminum plates which provides faster cooling rates than holding in air and also helps keeps specimens flat. It may be that those larger clusters are the limiting factor for toughness. However, it is also controlled by carbide size and I do not have any micrographs of the new steel. Here are some experimental results of different steels for CATRA slicing edge retention to get a feel for where SPY27 may sit: Toughness of steel can be difficult to predict based only on composition or carbide content. By Larry Connelley When looking at quality American-made knives, you'll notice that S35VN and S30V steel are two of the more popular steels for knife blades. According to the chemical composition and the HRC of the steel, the CPM s90v Steel has the following features: CPM s90v Edge Retention: With a high presence of vanadium and carbon, s90v steel offers extreme edge retention (might be the best in the steel). You can read about cold treatments in these articles: Part 1, Part 2, Part 3. Your email address will not be published. MSRP: $175.00. I’ll probably give it a go in the LW para 3 platform. So we can understand more the Steel, let’s see its chemical composition. CPM 3V is an American-made steel product by Crucible Industries in Syracuse, New York. The edge retention is likely a small step down from S35VN. All of these specimens included a cryo treatment after quenching before tempering. ... this one! So I was right that the toughness is “at least as good as S35VN” but the “probably better” was a bit too strong. Made by @Crucible CPM 20CV is a martensitic stainless steel high in Vanadium, Chromium, and Carbon for excellent wear resistance and corrosion resistance, it’s used for plastic injection feed screws, barrel liners, screw tips, mold cavities, and premium Knives.. The test involves heat treating steel, finishing it to 400 grit, and then spraying it every 8 hours either with purified water or 1% saltwater. As I said in the article, “I am probably unlikely to get flatstock for experiments due to the steel being exclusive to Spyderco.” However, after publishing I was contacted by Niagara Specialty Metals (company that hot rolls Crucible steels) and Spyderco offering me some steel for experiments. The Para 3 is Spyderco’s response to a public demand for a more compact, lightweight, and easily concealed military style blade. Exhibiting very good edge retention, corrosion resistance, and sharpenability, S30V is utilized by a variety of makers for its performance and balance. Spyderco: SpyOpera - Brown Canvas Micarta - Lockback - M390 - C255CMP ... CPM-S30V - C11FPPNS30V. The cobalt addition increases secondary hardening when tempering in the upper temperature range, which I have written about previously here and here. The ease or difficulty in burr removal would be more based on the heat treatment, particularly when it comes to retained austenite, as lower retained austenite makes burr removal easier. CPM SPY27 steel. The resulting steel is expected to have similar hardness and corrosion resistance to S30V and S35VN. Spyderco 2020 Reveal(CPM S45VN, REX45, CPM SPY27 steels) Close. CPM-S30V. 18. ... SPY27 supposedly will be more like S30V/S35Vn. Despite its age, it’s a truly superior steel. S90V has a better edge retention but let's all be honest, edge retention for most of us is just numbers on a piece of paper. Has been sharpened once and will come razor sharp ... Spyderco Para Millie 2 Liner Lock Knife Black G-10 & CPM-S30V C81GP2. S30V – 2000°F. You can see my corrosion resistance rating in the table below: This is a pretty decent corrosion resistance, similar to Elmax (7.8), but is below steels like S45VN (8.4), M390 (9.1), and Vanax (10). Niobium carbide is very hard, similar in hardness to vanadium carbide, so it makes a significant contribution to wear resistance. I will have an article on it hopefully in a couple weeks. In the previous SPY27 article I predicted that it would have “similar hardness to S35VN, S30V, and S45VN” when heat treating with similar parameters. S30V . The second model to come out with the new SPY27 steel is the Manix 2. Yojimbo™ 2 G-10 Brown Black Blade CPM S90V Exclusive. However, we can look at the composition and make some educated guesses on its performance which I will do below. There is a powder form, CPM-D2, ... Crucible intends SPY27 to be good all-around knife steel. SPY27 and S30V have “good” or “above average” corrosion resistance but cannot match 420HC. Native® 5 FRN CPM® SPY27™ ... UK Penknife™ Red G-10 CPM S30V Exclusive. The austenitizing temperatures were 1950, 2000, 2050, and 2100°F. The microstructure confirms somewhat reduced carbide content relative to S35VN, S30V, and S45VN. Although the longitudinal toughness for all three of these grades is about 25-28 ft. S45VN – 2000°F. There weren’t obvious differences in the microstructure of SPY27 between 2000 and 2050°F, however. Awesome work, Larrin! Martensitic is a specific type of stainless steel alloy. S35VN – 1975°F. Hopefully we will be able to learn more as knives are released. The S30V and 420HC were also austenitized at 1950°F. ; 2.25% of Molybdenum: Increase Machinability and strength. The premium steel boasts some of the best qualities of a good knife steel: it has great edge retention, solid corrosion resistance, and average ease of sharpening. https://www.patreon.com/Knifesteelnerds, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). The toughness ended up being slightly less than S35VN though at slightly higher hardness so in the end the toughness is equal. The steel appears to be relatively well balanced and should do well for Spyderco. Metallurgy and Testing of Knives and Steel. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition.
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