cpm spy27 vs s30v
The resulting steel is expected to have similar hardness and corrosion resistance to S30V and S35VN. I estimated edge retention for a hardness of 61 Rc. There weren’t obvious differences in the microstructure of SPY27 between 2000 and 2050°F, however. In my ratings of knife steel corrosion resistance, 420HC was rated similarly to S30V. 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. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition. OUT OF STOCK. $104.95. 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. And it gives everyone else a chance to see whether I am any good at predicting properties of steel based on composition. In general, lower carbide volume means higher toughness. 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. Each can reach approximately 64 Rc though are generally tempered down to the 58-61 Rc range depending on the manufacturer and heat treatment. CPM S110V Steel Chemical composition . SPY27 is expected to have slightly less edge retention than S35VN and to sharpen similarly or slightly better. Niobium carbide is very hard, similar in hardness to vanadium carbide, so it makes a significant contribution to wear resistance. All of these specimens included a cryo treatment after quenching before tempering. Based on the predicted alloy in solution for SPY27 it should have similar corrosion resistance to S30V and S35VN. I then tempered specimens twice for two hours each time at 300, 400, and 600°F and plotted out the resulting hardness. SPY27 has similar obtainable hardness to S35VN and similar corrosion resistance to S30V. If you want to see tests as they are completed come join us on Patreon. Some more information on nitrogen additions to these types of PM stainless steels can be found in this article on S45VN. The vanadium was reduced to 2% relative to S35VN. MSRP: $180.00. I will be posting results as they come in to Patreon and articles summarizing the tests will come later to this website. 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. I’ll probably give it a go in the LW para 3 platform. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition. It sharpens easier and is cheaper while still having a pretty great edge retention. The two SPY27 specimens look relatively similar to S30V, and all three are significantly worse than the 420HC. A 300°F temper is usually the minimum temperature I recommend while 400°F usually gives a good balance of hardness and toughness. $236.00. I am not sure if this is due to variability of corrosion testing or not. 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. lbs., the transverse toughness of CPM S30V is four times greater than that of 440C or 154CM. Discuss Spyderco's products and history. The resulting steel is expected to have similar hardness and corrosion resistance to S30V and S35VN. 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. The CPM S30V (Which is an acronym for Crucible Particle Metallurgy) is a quality, high endurance steel of American origin. Enter your email address to subscribe to this blog and receive notifications of new posts by email. I heat treated coupons of SPY27 by wrapping the steel in stainless foil to protect against scale and decarburization. The edge retention is likely a small step down from S35VN. 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. Manix 2 Lightweight CPM SPY27. Unfortunately, I am probably unlikely to get flatstock for experiments due to the steel being exclusive to Spyderco. 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. OUT OF STOCK. So I have spent the past couple months looking at the heat treating and toughness of CPM-154. It may be that those larger clusters are the limiting factor for toughness. 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. S45VN – 2000°F. Free shipping . Native® 5 FRN CPM® SPY27™ ... Para Military™ 2 G-10 Dark Blue CPM S110V. It also appears that SPY27 did somewhat worse than S30V. spyderco para 3 lightweight Cpm Spy27. 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. Nash, Matt Collingwood, Noah Cowan, James Pierce, and Jay Caponetti for becoming Knife Steel Nerds Patreon supporters! Sale Price: $122.50. $265.00. However, it is also controlled by carbide size and I do not have any micrographs of the new steel. CPM, makes the steel stronger than the SAME steel made using a conventional steel manufacturing process. On January 15, 2020 Spyderco announced  knives being produced in a new steel: CPM SPY27, a steel produced by Crucible. Employ especially on knives, its abilities to retain edge sharpness and resist rust are superb. The S30V sample I tested was austenitized at 2000°F and tempered at 500°F. There is also a small nitrogen addition which is made to increase hardness and corrosion resistance, as described in this article. Made from CPM-S30V particle metallurgy stainless steel, the blade is robust with a razor sharp and reliably tough edge. Quick View Thickness. Awesome work, Larrin! $151.25. $168.06. I would argue that S30V is better for every practical need. $269.95. I then refinished them and started the 1% saltwater test which was 48 hours long. CPM is a trademarked name for a process that is also called Powdered Metallurgy or PM steel. The 1% niobium content may help refine the overall carbide structure when compared with 0% or 0.5% Nb PM stainless steels. 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. There is a powder form, CPM-D2, ... Crucible intends SPY27 to be good all-around knife steel. Yojimbo™ 2 Carbon Fiber CPM 20CV Exclusive. The steel has the same Cr and Mo content as S30V and S35VN. At that point very little information was available about the steel other than the composition and that it was produced by Crucible steel. SPY27 – 2050°F. Yojimbo™ 2 G-10 Brown Black Blade CPM S90V Exclusive. I will have an article on it hopefully in a couple weeks. ; 2.25% of Molybdenum: Increase Machinability and strength. The CPM154 was marked at the point somewhere around 20 ft-lbs in your previous chart but now at 5-10 ft-lbs only? Although the longitudinal toughness for all three of these grades is about 25-28 ft. CPM SPY27 Steel. Despite its age, it’s a truly superior steel. The two steels aren’t related really. The Para 3 is Spyderco’s response to a public demand for a more compact, lightweight, and easily concealed military style blade. Native® 5 FRN CPM® SPY27™ ... UK Penknife™ Red G-10 CPM S30V Exclusive. 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. previously described corrosion resistance test, cobalt addition leading to slightly worse corrosion resistance. 5 months ago. The microstructure confirms somewhat reduced carbide content relative to S35VN, S30V, and S45VN. Metallurgy and Testing of Knives and Steel. Despite the reduced carbide content of SPY27 the toughness was similar to S35VN. Your email address will not be published. I compared the toughness results with S30V, S35VN, and S45VN. Crucible seems to be coming out with more steels lately. I have an article about SPY27 which I wrote immediately after the announcement of the steel. Thanks to ShavedAlpaca, giorgi chubinidze, and Сергей Якунин for becoming Knife Steel Nerds Patreon supporters! I have a new CATRA edge retention testing machine. So we can understand more the Steel, let’s see its chemical composition. However, as seen in the micrograph the “carbide clusters” in SPY27 are similar in size to the other steels. 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. CPM SPY27 steel. In the article on S45VN, I found that austenitizing at 2000°F led to a finer microstructure than 1950°F. So far only two stainless steels have failed this test, XHP and ZDP-189. Update 3/10/2020: We did a range of experiments with SPY27 to supplement the estimates in this article. Contrary to some information available out there, cobalt does not improve toughness or corrosion resistance. The purified water is to test if the steel is acting as a stainless. Hopefully we will be able to learn more as knives are released. The toughness ended up being slightly less than S35VN though at slightly higher hardness so in the end the toughness is equal. 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.
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