Despite the reduced carbide content of SPY27 the toughness was similar to S35VN. 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). The S35VN or CPM S35V is a high-end martensitic stainless steel made by @Crucible, high in Carbon, Vanadium, and chromium designed to offer a great balance between toughness, hardness and corrosion resistance.It’s used in long-wearing Specialty cutlery, Plastic Injection and Extrusion Feed Screws and Dies, Wear Components for Food and Chemical Processing, and of course in the Knife Industry. Enter your email address to subscribe to this blog and receive notifications of new posts by email. OUT OF STOCK. S35VN – 1975°F. For a while CPM-S30V was the top of the line steel. However, it is also controlled by carbide size and I do not have any micrographs of the new steel. Austenitizing at a higher temperature means more chromium carbide is dissolved putting more chromium “in solution” to contribute to corrosion resistance. CPM-S30V. 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. I took micrographs of the steel that tested for toughness, which means the heat treatments were 2000 or 2050°F austenitize, plate quench, cryo, and tempered at 400°F. It may be that without reducing the chromium carbide content to much lower levels that the toughness remains limited to about 10-12 ft-lbs as is seen with many of these stainless PM steels like Elmax, M390, CPM-154, S35VN, S30V, SG2, etc. However, there is another proposed explanation which I will cover along with the micrographs below. CPM-S30V has become one of the most used premium steels on the market among knife manufacturers. CPM SPY27 is a steel produced by Crucible exclusively for Spyderco. REX 45 will have better edge retention but less corrosion resistance. Crucible seems to be coming out with more steels lately. Yojimbo™ 2 G-10 Brown Black Blade CPM S90V Exclusive. Sale Price: $126.00. Your email address will not be published. Update 3/10/2020: We did a range of experiments with SPY27 to supplement the estimates in this article. So far only two stainless steels have failed this test, XHP and ZDP-189. The carbide structure is explored in the next section. Thanks to ShavedAlpaca, giorgi chubinidze, and Сергей Якунин for becoming Knife Steel Nerds Patreon supporters! Para Military™ 2 G-10 Dark Gray Maxamet. 36 . CPM S30V 10.0 ft. lbs. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! SPY27, S30V, and 420HC all passed without corrosion after 4 days. A 300°F temper is usually the minimum temperature I recommend while 400°F usually gives a good balance of hardness and toughness. 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. Shipped with USPS First Class. $151.25. CPM SPY27 Steel. There is also a small nitrogen addition which is made to increase hardness and corrosion resistance, as described in this article. The S30V sample I tested was austenitized at 2000°F and tempered at 500°F. These higher transverse toughness results indicate that CPM S30V is much 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. The Para 3 Lightweight and Manix 2 Lightweight will be the first two models to feature CPM SPY27 blade steel. I compared the toughness results with S30V, S35VN, and S45VN. Though it should be a little easier to abrade away steel because of the lower chromium carbide content (M7C3). I have been wanting to see a steel like this made for some time, and it is great to see how it performs. There weren’t obvious differences in the microstructure of SPY27 between 2000 and 2050°F, however. I am not sure if this is due to variability of corrosion testing or not. Being a little bigger than the Para 3 and utilizing the strong ball bearing locking mechanism and light weight FRCP handles this is sure to be a great knife. 5 months ago. The purified water is to test if the steel is acting as a stainless. How is it related to MAXAMET ?vObviously I understand it is not as hard but what about the overall quality? Qty. Spyderco: Native 5 Lightweight - Cobalt Blue FRN - Lockback - CPM-SPY27 - C41PCBL5. Free shipping . CPM 3V is an American-made steel product by Crucible Industries in Syracuse, New York. It may be that the reduced carbon content when compared with S35VN leads to superior toughness. Originally developed by both Chris Reeve (a world renowned knife maker) and Dick Barber of Crucible Industries, S30V is a martensitic powder-made stainless steel. I have previously performed corrosion resistance experiments and related it to predicted chromium and other alloying elements “in solution,” as you can read here. $217.95. $236.00. I have an article about SPY27 which I wrote immediately after the announcement of the steel. Niobium carbides have also been found to help refine the microstructure of steel. 18. Native® 5 FRN CPM® SPY27™ ... Para Military™ 2 G-10 Dark Blue CPM S110V. The toughness is very close to S35VN. 18 . Some more information on nitrogen additions to these types of PM stainless steels can be found in this article on S45VN. Sale Price: $122.50. 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. Posted by. However, as seen in the micrograph the “carbide clusters” in SPY27 are similar in size to the other steels. 3/32" 1/8" 5/32" 3/16" Width. CPM S110V Steel Chemical composition . Here’s what Buck Knives says about S30V: “We consider this the absolute best blade steel available, and it is made in America.” 154CM 2.5 ft. lbs. Required fields are marked *. And it gives everyone else a chance to see whether I am any good at predicting properties of steel based on composition. ... this one! That’s very interesting. 2.8% of Carbon: It improves hardness and wear/corrosion resistance, but a high amount of it decreases strength. 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. Yojimbo™ 2 Natural G-10 CPM M4 Exclusive. I used carbide contents from Thermo-Calc to estimate CATRA edge retention relative to 440C at 58 Rc (100%). I could not tell the difference between the two heat treatments in this case, however. The Sebenza 21. 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. The edge retention is likely a small step down from S35VN. ; 9% of Vanadium: Improves wear resistance and hardenability. Thank you for the article Larrin. The cobalt addition increases secondary hardening when tempering in the upper temperature range, which I have written about previously here and here. Exhibiting very good edge retention, corrosion resistance, and sharpenability, S30V is utilized by a variety of makers for its performance and balance. It's a rare occurrence that we need that level of performance. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition. ; 2.25% of Molybdenum: Increase Machinability and strength. 1" 1 1/4" 1 1/2" 2" 4" Length. The steel appears to be relatively well balanced and should do well for Spyderco. I would argue that S30V is better for every practical need. MSRP: $180.00. The edge retention is likely a small step down from S35VN. Para Military™ 2 G-10 Digital Camo/Black Blade. Employ especially on knives, its abilities to retain edge sharpness and resist rust are superb. 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. The SPY refers to Spyderco and 27 is the atomic number of cobalt . I’ll probably give it a go in the LW para 3 platform. It may be that those larger clusters are the limiting factor for toughness. Thanks to A.N. You can read about cold treatments in these articles: Part 1, Part 2, Part 3. So I was right that the toughness is “at least as good as S35VN” but the “probably better” was a bit too strong. $104.95. 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. Chris Reeve is famous for developing two steels directly with Crucible Industries, and boy did this partnership result in an awesome product. The more steels and heat treatments we have added to the toughness chart the more that value of CPM-154 has looked out of place. level 2. Metallurgy and Testing of Knives and Steel. I estimated edge retention for a hardness of 61 Rc. lbs., the transverse toughness of CPM S30V is four times greater than that of 440C or 154CM. This provides the steel good flexibility, offering easy heat treatment to 60 Rc with commercial heat treating and also higher levels if desired. All of these specimens included a cryo treatment after quenching before tempering. Manix 2 Lightweight CPM SPY27. CPM S30V Stainless Steel Blanchard Ground. It sharpens easier and is cheaper while still having a pretty great edge retention. 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. At that point very little information was available about the steel other than the composition and that it was produced by Crucible steel. $216.00. I then tempered specimens twice for two hours each time at 300, 400, and 600°F and plotted out the resulting hardness. It sucks its exclusive to spyderco. 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). Based on the predicted alloy in solution for SPY27 it should have similar corrosion resistance to S30V and S35VN. 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. Despite the reduced carbide content of SPY27 the toughness was similar to S35VN. S30V . The steel can be heat treated over 64 Rc with a liquid nitrogen treatment and a 300°F temper and a range of lower hardness levels with different combinations of parameters. 440C 2.5 ft. lbs. 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. Discuss Spyderco's products and history. I heat treated coupons of SPY27 by wrapping the steel in stainless foil to protect against scale and decarburization. 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.. You can read about edge retention and predicting it based on carbide content and hardness here. CPM SPY27 steel. S30V – 2000°F. Had a couple scratches on blade and a couple on handle. The steel has the same Cr and Mo content as S30V and S35VN. 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. Hopefully we will be able to learn more as knives are released. The Para 3 is Spyderco’s response to a public demand for a more compact, lightweight, and easily concealed military style blade. I got a question about the toughness of CPM154 in your chart. In the previous SPY27 article I predicted that it would have “similar hardness to S35VN, S30V, and S45VN” when heat treating with similar parameters. Contrary to some information available out there, cobalt does not improve toughness or corrosion resistance. The CPM154 was marked at the point somewhere around 20 ft-lbs in your previous chart but now at 5-10 ft-lbs only? S45VN – 2000°F. I then refinished them and started the 1% saltwater test which was 48 hours long. Although the longitudinal toughness for all three of these grades is about 25-28 ft. SPY27 has similar obtainable hardness to S35VN and similar corrosion resistance to S30V. And sharpening is probably a bit easier to S35VN. The Cr and Mo addition provides corrosion resistance, hardenability, and secondary hardening. Nash, Matt Collingwood, Noah Cowan, James Pierce, and Jay Caponetti for becoming Knife Steel Nerds Patreon supporters! The two SPY27 specimens look relatively similar to S30V, and all three are significantly worse than the 420HC. Notify me of follow-up comments by email. 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. The microstructure confirms somewhat reduced carbide content relative to S35VN, S30V, and S45VN. The blade, which is constructed with high performance CPM-S30V, is fully flat ground, making it a breeze to re-sharpen. The composition  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. Despite its age, it’s a truly superior steel. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! Great breakdown Larrin. This is a lucky opportunity since it gives me the chance to see what the properties of the steel really are. So we can understand more the Steel, let’s see its chemical composition. 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. The MC carbides are harder than most common abrasives apart from diamond and CBN, so lower MC content leads to easier sharpenability. The S30V and 420HC were also austenitized at 1950°F. I expected the toughness to be better because of the reduced carbon and carbide content when compared with S35VN. This new design features a slimmer profile so that it feels better in the closed position. $310.00. Exclusive Steel: Spyderco Native 5 With SPY27 Knife Review – Now Reviews Hub, Exclusive Steel: Spyderco Native 5 With SPY27 Knife Review | GearJunkie - GARDEN OUTDOOR PRESS, Exclusive Steel: Spyderco Native 5 With SPY27 Knife Review – Nowhere Bound Company. You can see more ratings in the corrosion resistance article I linked to above. Yojimbo™ 2 Carbon Fiber CPM 20CV Exclusive. In my ratings of knife steel corrosion resistance, 420HC was rated similarly to S30V. OUT OF STOCK. $329.95. In the article on S45VN, I found that austenitizing at 2000°F led to a finer microstructure than 1950°F. There is a powder form, CPM-D2, ... Crucible intends SPY27 to be good all-around knife steel. However, as seen in the micrograph the “carbide clusters” in SPY27 are similar in size to the other steels. In general, lower carbide volume means higher toughness. Enter your email address to subscribe to this blog and receive notifications of new posts by email. You can read those experiments here. Speaking of S45VN, it is somewhat surprising that this steel has been announced so shortly after that steel being announced and released. $265.00. So I have spent the past couple months looking at the heat treating and toughness of CPM-154. Required fields are marked *. Unfortunately, I am probably unlikely to get flatstock for experiments due to the steel being exclusive to Spyderco.  https://catalog.spyderco.com/Reveal4/?page=10,  https://forum.spyderco.com/viewtopic.php?f=2&t=85769,  https://www.spyderco.com/edge-u-cation/steel-chart/. I will have an article on it hopefully in a couple weeks. The vanadium was reduced to 2% relative to S35VN. The steel is reportedly exclusive to Spyderco. from $34.87. I will be posting results as they come in to Patreon and articles summarizing the tests will come later to this website. If you want to see tests as they are completed come join us on Patreon. Metallurgy and Testing of Knives and Steel. I have a new CATRA edge retention testing machine. Here is a chart of other steels to compare with S35VN: With similar MC carbide content (NbC + VC) to S35VN and S45VN, SPY27 which be expected to sharpen similar to those two steels. I will be happy with edge performance anywhere in the S30V/Elmax range. Spyderco 2020 Reveal(CPM S45VN, REX45, CPM SPY27 steels) Close. CPM S30V Stainless Steel Precision Ground. The second model to come out with the new SPY27 steel is the Manix 2. Made from CPM-S30V particle metallurgy stainless steel, the blade is robust with a razor sharp and reliably tough edge. Martensitic is a specific type of stainless steel alloy. Each can reach approximately 64 Rc though are generally tempered down to the 58-61 Rc range depending on the manufacturer and heat treatment. The resulting steel is expected to have similar hardness and corrosion resistance to S30V and S35VN. You can read more about this in the article on S35VN. However, we can look at the composition and make some educated guesses on its performance which I will do below. Has been sharpened once and will come razor sharp ... Spyderco Para Millie 2 Liner Lock Knife Black G-10 & CPM-S30V C81GP2. CPM SPY27 is a steel produced by Crucible exclusively for Spyderco. I'm curious about that Spy27 steel and the Rex45! CPM, makes the steel stronger than the SAME steel made using a conventional steel manufacturing process. However, you can still see my predictions in that previous article. See the edge retention prediction chart to see the expected carbide volume of SPY27 which came in under S35VN, S30V, S45VN, and Super Gold 2, and is also lower than Elmax and M390 which are not shown in the table. The 1% niobium content may help refine the overall carbide structure when compared with 0% or 0.5% Nb PM stainless steels. It may be that those larger clusters are the limiting factor for toughness. The toughness ended up being slightly less than S35VN though at slightly higher hardness so in the end the toughness is equal. Maxamet is a non-stainless high speed steel capable of high hardness. CPM is a trademarked name for a process that is also called Powdered Metallurgy or PM steel. The CPM S30V (Which is an acronym for Crucible Particle Metallurgy) is a quality, high endurance steel of American origin. Native® 5 FRN CPM® SPY27™ ... UK Penknife™ Red G-10 CPM S30V Exclusive. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition. I don’t have a good quantitative test for finishing or sharpening and I have not yet performed any edge retention experiments. I’m so confused about it since I thought CPM154 is very good at toughness aside from its medium edge retention and corrosion resistance. The composition of the steel along with some other in the same class are shown below. ... CPM 20V, and CTS 204P), we would have the differences from different processes at the different mills and possibly different heat treats.
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