Metallurgy and Testing of Knives and Steel. This elite expression of the Manix 2 Lightweight combines its weight-saving advantages, full-service cutting power, and the strength of the Ball Bearing Lock™ mechanism with the enhanced edge retention and corrosion resistance of CPM SPY27. Click here to download a PDF of this steel chart (107kb) Click here to download a two-page brochure with more details about steel(14 MB). A 300°F temper is usually the minimum temperature I recommend while 400°F usually gives a good balance of hardness and toughness. Ambidextrous wire clip for left or right side carry. 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. I am looking forward to seeing how this steel compares to others once we get some real-world feedback from users. $200.00. 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. According to the chemical composition and the HRC of the steel, the CPM 20cv Steel has the following features: CPM 20cv Edge Retention: CPM 20CV offers excellent edge retention due to the high carbon, high vanadium and high chromium in it. It also appears that SPY27 did somewhat worse than S30V. Contact Us 1.866.257.7270 | [email protected]. These two Sprint Runs are color-coded forest green and have a Diamond Arc texturing pattern cut into their G-10 scales. 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. 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 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. 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 steel appears to be relatively well balanced and should do well for Spyderco. 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. In the previous SPY27 article I predicted that it would have “similar hardness to S35VN, S30V, and S45VN” when heat treating with similar parameters. In general, lower carbide volume means higher toughness. The steel is reportedly exclusive to Spyderco. Crucible intends SPY27 to be good all-around knife steel. WE CAN NOT SHIP TO THE U.S.A. Crucible seems to be coming out with more steels lately. This elite expression of the Manix 2 Lightweight combines its weight-saving advantages, full-service cutting power, and the strength of the Ball Bearing Lock mechanism with the enhanced edge retention and corrosion resistance of CPM SPY27. I used carbide contents from Thermo-Calc to estimate CATRA edge retention relative to 440C at 58 Rc (100%). The composition of the steel along with some other in the same class are shown below. The cobalt addition increases secondary hardening when tempering in the upper temperature range, which I have written about previously here and here. Edge Retention (also called strength) is your knife’s ability to hold sharpness during use. The toughness ended up being slightly less than S35VN though at slightly higher hardness so in the end the toughness is equal. This elite expression of the Manix 2 Lightweight combines its weight-saving advantages, full-service cutting power, and the strength of the Ball Bearing Lock™ mechanism with the enhanced edge retention and corrosion resistance of CPM SPY27. It looks great and lets you know you're getting something special. SPY27. The 1% niobium content may help refine the overall carbide structure when compared with 0% or 0.5% Nb PM stainless steels. I do gear reviews, steel edge retention testing, gag videos and outdoor adventure videos. KNIVES PLUS ® Home https://www.patreon.com/Knifesteelnerds, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). 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. It sucks its exclusive to spyderco. It may be that those larger clusters are the limiting factor for toughness. You can read about cold treatments in these articles: Part 1, Part 2, Part 3. Contrary to some information available out there, cobalt does not improve toughness or corrosion resistance. 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. Thanks to A.N. I may have to do some more corrosion testing and modify the ratings. Niobium carbide is very hard, similar in hardness to vanadium carbide, so it makes a significant contribution to wear resistance. The SPY refers to Spyderco and 27 is the atomic number of cobalt [2]. Great breakdown Larrin. The steel has the same Cr and Mo content as S30V and S35VN. # spyderco # spydercoknives # newatspyderco # manixmonday # spy27 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 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. 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. Hopefully we will be able to learn more as knives are released. I expected the toughness to be better because of the reduced carbon and carbide content when compared with S35VN. Niobium carbides have also been found to help refine the microstructure of steel. Features: CPM-SPY27 steel has incredible edge retention and corrosion resistance. Spyderco Native 5 CPM-SPY27. Spyderco C223PCBL Para 3 Lightweight - 2.92" Satin Finish Plain Edge CPM-SPY27 Blade - Cobalt Blue FRN Handle Spyderco. 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. This elite expression of the Manix 2 Lightweight combines its weight-saving advantages, full-service cutting power, and the strength of the Ball Bearing Lock mechanism with the enhanced edge retention and corrosion resistance of CPM SPY27. The edge retention is likely a small step down from S35VN. Here is a chart of other steels to compare with S35VN: With similar MC carbide content (NbC + VC) to S35VN and S45VN, SPY27 would be expected to sharpen similar to those two steels. 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 Manix 2 Lightweight weighs in at just 3 … CPM-SPY27 steel has incredible edge retention and corrosion resistance. 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. The austenitizing temperatures were 1950, 2000, 2050, and 2100°F. SPY27 and S30V have “good” or “above average” corrosion resistance but cannot match 420HC. Handle Material: FRCP And sharpening is probably a bit easier to S35VN. https://www.patreon.com/Knifesteelnerds, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). ... Do you know if there are plans to charpy impact test all of the samples used in the edge retention test so that the edge retention and toughness data all correlates with the exact samples used? This elite expression of the Manix 2 Lightweight combines its weight-saving advantages, full-service cutting power, and the strength of the Ball Bearing Lock™ mechanism with the enhanced edge retention and corrosion resistance of CPM SPY27. 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. 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. This elite expression of the Manix 2 Lightweight combines its weight-saving advantages, full-service cutting power, and the strength of the Ball Bearing Lock™ mechanism with the enhanced edge retention and corrosion resistance of CPM SPY27. Thanks to ShavedAlpaca, giorgi chubinidze, and Сергей Якунин for becoming Knife Steel Nerds Patreon supporters! This elite expression of the Manix 2 Lightweight combines its weight-saving advantages, full-service cutting power, and the strength of the Ball Bearing Lock™ mechanism with the enhanced edge retention and corrosion resistance of CPM SPY27. However, you can still see my predictions in that previous article. You can read about edge retention and predicting it based on carbide content and hardness here. 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. How is it related to MAXAMET ?vObviously I understand it is not as hard but what about the overall quality? Thank you for the article Larrin. This elite expression of the Manix 2 Lightweight combines its weight-saving advantages, full-service cutting power, and the strength of the Ball Bearing Lock™ mechanism with the enhanced edge retention and corrosion resistance of CPM SPY27. SPY27 has similar obtainable hardness to S35VN and similar corrosion resistance to S30V. Specifications: CPM SPY27 is a steel produced by Crucible exclusively for Spyderco. Update 3/10/2020: We did a range of experiments with SPY27 to supplement the estimates in this article. Based on the predicted alloy in solution for SPY27 it should have similar corrosion resistance to S30V and S35VN. In the article on S45VN, I found that austenitizing at 2000°F led to a finer microstructure than 1950°F. previously described corrosion resistance test, cobalt addition leading to slightly worse corrosion resistance. SPY27 is expected to have slightly less edge retention than S35VN and to sharpen similarly or slightly better. CPM SPY27 combines important alloys to create a steel with high hardness, edge retention, toughness, and stain resistance. I compared the toughness results with S30V, S35VN, and S45VN. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! I performed two heat treatments with SPY27, one austenitizing at 1950°F and another at 2050°F. I have an article about SPY27 which I wrote immediately after the announcement of the steel. Notify me of follow-up comments by email. This elite expression of the Manix 2 Lightweight combines its weight-saving advantages, full-service cutting power, and the strength of the Ball Bearing Lock™ mechanism with the enhanced edge retention and corrosion resistance of CPM SPY27. Using this steel with the Manix 2 Lightweight combines its weight-saving advantages, full-service cutting power, and the strength of the Ball Bearing Lock™ mechanism with the enhanced edge retention and corrosion resistance of CPM-SPY27. Overall Length: 7.21" (183mm) Closed Length: 4.29" (109mm) Blade Length: 2.92" (74mm) Blade Steel: CPM SPY27. Unfortunately, I am probably unlikely to get flatstock for experiments due to the steel being exclusive to Spyderco. A new steel from Crucible, SPY27 launched in 2020 in the Spyderco Native 5 and Para 3. Speaking of S45VN, it is somewhat surprising that this steel has been announced so shortly after that steel being announced and released. The Para 3 ... S45VN’s formulation improves edge retention and corrosion resistance over S35VN, while sacrificing a little bit of toughness. CPM SPY27 Steel. Developed in coordination with steel manufacturer Crucible Industries, SPY27 is carefully tuned with the addition of cobalt to balance great edge retention with ease of maintenance. There is also a small nitrogen addition which is made to increase hardness and corrosion resistance, as described in this article. So I have spent the past couple months looking at the heat treating and toughness of CPM-154. They've paired their new steel with Cobalt Blue scales. Spyderco This elite expression of the Manix 2 Lightweight combines its weight-saving advantages, full-service cutting power, and the strength of the Ball Bearing Lock mechanism with the enhanced edge retention and corrosion resistance of CPM-SPY27. This provides the steel good flexibility, offering easy heat treatment to 60 Rc with commercial heat treating and also higher levels if desired. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition. In my ratings of knife steel corrosion resistance, 420HC was rated similarly to S30V. Metallurgy and Testing of Knives and Steel. And it gives everyone else a chance to see whether I am any good at predicting properties of steel based on composition. So far only two stainless steels have failed this test, XHP and ZDP-189. I am not sure if this is due to variability of corrosion testing or not. I got a question about the toughness of CPM154 in your chart. You can also see that the trend for this class of steels is to have improved toughness with higher hardening temperatures, at least up to 2050°F. The CPM154 was marked at the point somewhere around 20 ft-lbs in your previous chart but now at 5-10 ft-lbs only? Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! The vanadium was reduced to 2% relative to S35VN.

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