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. It sharpens easier and is cheaper while still having a pretty great edge retention. from $34.87. Spyderco 2020 Reveal(CPM S45VN, REX45, CPM SPY27 steels) Close. Qty. S30V . The Para 3 is Spyderco’s response to a public demand for a more compact, lightweight, and easily concealed military style blade. It may be that the reduced carbon content when compared with S35VN leads to superior toughness. Condition is Used. However, it is also controlled by carbide size and I do not have any micrographs of the new steel. The steel appears to be relatively well balanced and should do well for Spyderco. That’s very interesting. level 2. There is also a small nitrogen addition which is made to increase hardness and corrosion resistance, as described in this article. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition. Although the longitudinal toughness for all three of these grades is about 25-28 ft. The two steels aren’t related really. Despite the reduced carbide content of SPY27 the toughness was similar to S35VN. $168.06. The two SPY27 specimens look relatively similar to S30V, and all three are significantly worse than the 420HC. Maxamet is a non-stainless high speed steel capable of high hardness. I used carbide contents from Thermo-Calc to estimate CATRA edge retention relative to 440C at 58 Rc (100%). 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. So I have spent the past couple months looking at the heat treating and toughness of CPM-154. 154CM 2.5 ft. lbs. In the previous SPY27 article I predicted that it would have “similar hardness to S35VN, S30V, and S45VN” when heat treating with similar parameters. 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. Posted by. OUT OF STOCK. $216.00. It may be that those larger clusters are the limiting factor for toughness. 1" 1 1/4" 1 1/2" 2" 4" Length. The S30V and 420HC were also austenitized at 1950°F. Your email address will not be published. I will have an article on it hopefully in a couple weeks. Some more information on nitrogen additions to these types of PM stainless steels can be found in this article on S45VN. The toughness ended up being slightly less than S35VN though at slightly higher hardness so in the end the toughness is equal. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! Your email address will not be published. The steel is reportedly exclusive to Spyderco. Nash, Matt Collingwood, Noah Cowan, James Pierce, and Jay Caponetti for becoming Knife Steel Nerds Patreon supporters! Employ especially on knives, its abilities to retain edge sharpness and resist rust are superb. There is a powder form, CPM-D2, ... Crucible intends SPY27 to be good all-around knife steel. You can read about edge retention and predicting it based on carbide content and hardness here. spyderco para 3 lightweight Cpm Spy27. CPM SPY27 Steel. In my ratings of knife steel corrosion resistance, 420HC was rated similarly to S30V. CPM SPY27 steel. I heat treated coupons of SPY27 by wrapping the steel in stainless foil to protect against scale and decarburization. The Sebenza 21. The toughness is probably a bit better than S35VN. I estimated edge retention for a hardness of 61 Rc. CPM S30V Stainless Steel Precision Ground. The compression lock is easy to unlock with a single hand and has a four way clip which will carry in any position that is desired. The CPM154 was marked at the point somewhere around 20 ft-lbs in your previous chart but now at 5-10 ft-lbs only? Metallurgy and Testing of Knives and Steel. 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. S30V – 2000°F. Free shipping .  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. ... CPM 20V, and CTS 204P), we would have the differences from different processes at the different mills and possibly different heat treats. Hopefully we will be able to learn more as knives are released. Native® 5 FRN CPM® SPY27™ ... UK Penknife™ Red G-10 CPM S30V Exclusive. 5 months ago. The 1% niobium content may help refine the overall carbide structure when compared with 0% or 0.5% Nb PM stainless steels. The Cr and Mo addition provides corrosion resistance, hardenability, and secondary hardening. The S30V sample I tested was austenitized at 2000°F and tempered at 500°F. Contrary to some information available out there, cobalt does not improve toughness or corrosion resistance. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition. SPY27 and S30V have “good” or “above average” corrosion resistance but cannot match 420HC. The austenitizing temperatures were 1950, 2000, 2050, and 2100°F. 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.. I’ll probably give it a go in the LW para 3 platform. Though it should be a little easier to abrade away steel because of the lower chromium carbide content (M7C3). Para Military™ 2 G-10 Digital Camo. This provides the steel good flexibility, offering easy heat treatment to 60 Rc with commercial heat treating and also higher levels if desired. The microstructure confirms somewhat reduced carbide content relative to S35VN, S30V, and S45VN. So I was right that the toughness is “at least as good as S35VN” but the “probably better” was a bit too strong. Sale Price: $122.50. 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. And sharpening is probably a bit easier to S35VN. 440C 2.5 ft. lbs. Update 3/10/2020: We did a range of experiments with SPY27 to supplement the estimates in this article. 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. CPM S30V Stainless Steel Blanchard Ground. CPM, makes the steel stronger than the SAME steel made using a conventional steel manufacturing process. I'm curious about that Spy27 steel and the Rex45! The toughness is very close to S35VN. 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. You can read more about this in the article on S35VN. Crucible seems to be coming out with more steels lately. I have previously performed corrosion resistance experiments and related it to predicted chromium and other alloying elements “in solution,” as you can read here. I am not sure if this is due to variability of corrosion testing or not. You can read more about niobium in this article. 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. lbs., the transverse toughness of CPM S30V is four times greater than that of 440C or 154CM. I compared the toughness results with S30V, S35VN, and S45VN. CPM S30V 10.0 ft. lbs. 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. $310.00. S45VN – 2000°F. https://www.patreon.com/Knifesteelnerds, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). A 300°F temper is usually the minimum temperature I recommend while 400°F usually gives a good balance of hardness and toughness. 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. However, as seen in the micrograph the “carbide clusters” in SPY27 are similar in size to the other steels. Sale Price: $126.00. The resulting steel is expected to have similar hardness and corrosion resistance to S30V and S35VN. 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. 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. Para Military™ 2 Left Hand G-10 Black. If you want to see tests as they are completed come join us on Patreon. However, there is another proposed explanation which I will cover along with the micrographs below. 18. A further modification was made to S30V which became S35VN released in 2009. SPY27, S30V, and 420HC all passed without corrosion after 4 days. It also appears that SPY27 did somewhat worse than S30V. I will be posting results as they come in to Patreon and articles summarizing the tests will come later to this website. There weren’t obvious differences in the microstructure of SPY27 between 2000 and 2050°F, however. $104.95. ; 15.25% of Chromium: For tensile strength and Edge retention, and enhances corrosion resistance and wear resistance. https://www.patreon.com/Knifesteelnerds, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). 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. I would argue that S30V is better for every practical need. It sucks its exclusive to spyderco. Para Military™ 2 G-10 Digital Camo/Black Blade. 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. $216.00. Unfortunately, I am probably unlikely to get flatstock for experiments due to the steel being exclusive to Spyderco. S30V is, in many eyes, the ultimate EDC steel. I have a new CATRA edge retention testing machine. So far only two stainless steels have failed this test, XHP and ZDP-189. It may be that those larger clusters are the limiting factor for toughness. 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. Despite its age, it’s a truly superior steel. You can read about cold treatments in these articles: Part 1, Part 2, Part 3. $236.00. You can see more ratings in the corrosion resistance article I linked to above. $217.95. Chris Reeve is famous for developing two steels directly with Crucible Industries, and boy did this partnership result in an awesome product. Therefore I would expect SPY27 to have toughness at least as good as S35VN and probably better, but that would have to be confirmed experimentally. 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. Had a couple scratches on blade and a couple on handle. The edge retention is likely a small step down from S35VN. 3/32" 1/8" 5/32" 3/16" Width. How is it related to MAXAMET ?vObviously I understand it is not as hard but what about the overall quality? ... SPY27 supposedly will be more like S30V/S35Vn. Martensitic is a specific type of stainless steel alloy. Yojimbo™ 2 G-10 Brown Black Blade CPM S90V Exclusive. Niobium carbides have also been found to help refine the microstructure of steel. REX 45 will have better edge retention but less corrosion resistance. 36 . For that article I predicted the relative performance of the steel based on its composition as no material was available for me to test. 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. ; 9% of Vanadium: Improves wear resistance and hardenability. [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/. 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. Manix 2 Lightweight CPM SPY27. Thanks to ShavedAlpaca, giorgi chubinidze, and Сергей Якунин for becoming Knife Steel Nerds Patreon supporters! Awesome work, Larrin! Niobium carbide is very hard, similar in hardness to vanadium carbide, so it makes a significant contribution to wear resistance. 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). The MC carbides are harder than most common abrasives apart from diamond and CBN, so lower MC content leads to easier sharpenability. 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. 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. 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. The SPY refers to Spyderco and 27 is the atomic number of cobalt [2]. 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. 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. I could not tell the difference between the two heat treatments in this case, however. Based on the predicted alloy in solution for SPY27 it should have similar corrosion resistance to S30V and S35VN. 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. 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. Enter your email address to subscribe to this blog and receive notifications of new posts by email. The vanadium was reduced to 2% relative to S35VN. Metallurgy and Testing of Knives and Steel. The composition of the steel along with some other in the same class are shown below. I expected the toughness to be better because of the reduced carbon and carbide content when compared with S35VN. Yojimbo™ 2 Natural G-10 CPM M4 Exclusive. 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. Each can reach approximately 64 Rc though are generally tempered down to the 58-61 Rc range depending on the manufacturer and heat treatment. 18 . This new design features a slimmer profile so that it feels better in the closed position. Spyderco: Native 5 Lightweight - Cobalt Blue FRN - Lockback - CPM-SPY27 - C41PCBL5. 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. ... this one! 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. It's a rare occurrence that we need that level of performance. However, as seen in the micrograph the “carbide clusters” in SPY27 are similar in size to the other steels. 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. 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 Dark Gray Maxamet. I got a question about the toughness of CPM154 in your chart. Here’s what Buck Knives says about S30V: “We consider this the absolute best blade steel available, and it is made in America.” Spyderco: SpyOpera - Brown Canvas Micarta - Lockback - M390 - C255CMP ... CPM-S30V - C11FPPNS30V. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! $151.25. However, you can still see my predictions in that previous article. Shipped with USPS First Class. The edge retention is likely a small step down from S35VN. ; 2.25% of Molybdenum: Increase Machinability and strength. In general, lower carbide volume means higher toughness. You can read those experiments here. SPY27 has similar obtainable hardness to S35VN and similar corrosion resistance to S30V. S35VN had a somewhat reduced vanadium content (3%) in combination with 0.5% niobium. The second model to come out with the new SPY27 steel is the Manix 2. These higher transverse toughness results indicate that CPM S30V is much CPM 3V is an American-made steel product by Crucible Industries in Syracuse, New York. Discuss Spyderco's products and history. CPM is a trademarked name for a process that is also called Powdered Metallurgy or PM steel.