These facts alone should tell you something. 2) The specifics of heat treatment may mean that changing hardness doesn’t lead to an increase in toughness, or one which is smaller than might be hoped for. Around 1950-1951, David Giles of Latrobe Steel patented two “cold work” high vanadium steels [1][2] which were later named A7 and D7. However, I had a suspicion that the samples were heat treated at a temperature which was too high, leading to excess “retained austenite.” Excess retained austenite drops the hardness by a small amount but lowers the “yield strength” relative to the hardness, and also can transform to brittle, untempered martensite during use. Má vysokou abrazivdornost, korozní odolnost, nárazovou houževnatost a výbornou leštitelnost. The higher tempering temperature was necessary to achieve a similar hardness to the original samples that were tempered at only 365°F. However, there are a couple things to keep in mind: 1) High carbide steels have smaller increases in toughness with lower hardness. They began surface grinding the material to avoid that issue. save. Known as a super-steel, M390 is a premium powdered stainless steel. CPM-20CV is Crucible’s version of Bohler’s popular M390 steel which also influenced Carpenter to copycat with CTS-204P. Interesting, thanks for your time and feedback. Preferably under a very fixed angle. Select steels from the Interactive Knife Steel Composition … 20 CV / M390 VS ZDP-189 I've been happy with the performance of my M390 knives. $279.98 $ 279. The rapid cooling to produce powder rather than slow cooling to form an ingot leads to less segregation of alloy in the steel and a finer microstructure. M390 has excellent corrosion resistance, potential hardness, and edge retention. SOG then released the Team Leader model in Duratech 20CV. This is true when using aluminum oxide abrasives, anyway. 20CV steel retains its sharpness well, is stainless and very hard. A7 was a modification of A2 with higher carbon and vanadium for wear resistance. At the time of posting it’s about 30 within good HRC vs. about 65 that are below. The toughness of the new specimens was significantly lower, and more in line with expectation based on the carbide content and relatively large carbides: So when plotting all of the steels for toughness together you can see that M390 has relatively low toughness. Bohler-Uddeholm USA also conducted CATRA and toughness experiments to help in the marketing of their knife steels at that time. Latrobe separated from Timken in 2006 [9] but continued to sell Duratech 20CV and it became popular with several major knife manufacturers. When sharpening with diamond or CBN stones there would be no benefit. M390 vs S90V (CPM S90V) M390 Benchmade 20cv is outstanding in my book. What it is: M390 stainless steel, a powder-metallurgy material produced by Bohler-Uddeholm, is widely regarded as a "super steel" for its properties and performance. Come to Patreon if you want updates on testing as it is completed. That is to say: you won't get very far by using a simple Arkansas stone. I've always loved m390/20cv more than any other steel, well except for maybe 154cm from my noob days, so I'll probably stick with the 20cv. Is there a reason people prefer M390 over CTS-204P? report. As a Powder Metallurgy (PM) tool steel, you get a combination of impressive wear resistance and edge retention plus the added benefit of being highly corrosion resistant due to high levels of chromium. ). https://www.patreon.com/Knifesteelnerds, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). With Kershaw Link 20CV, I have put the blade to test by cutting different things, opening consignment bags, Paper cutting test etc. Chromium carbides tend to be larger than vanadium carbides in power metallurgy steels which limits toughness, but they are easier to sharpen because they are softer than common sharpening abrasives like aluminum oxide. See the S35VN heat treating and toughness testing to see of an example of why that may be the case. Starting with the high carbon, 4% vanadium K190 as its basis means that M390 would have relatively high wear resistance. Available Steels S35vn Vs 20cv Cts Xhp Bladeforums . This premium "super steel" is used in many Benchmade knives and several Hinderer and Zero Tolerance models. The Latrobe data shows all results relative to 440C, where 440C is set to 100, and every other result is divided by 440C to show how it does in comparison. It is a bit puzzling why the tungsten was added to M390 when it was not present in the K190. Edge retention testing is continuing, we have now tested 18 different steels, and four of those steels with multiple heat treatments. On a chemical level there are a couple types of steel that closely resemble M390. Featuring, excellent corrosion resistance and very high hardness for excellent wear resistance, Bohler-Uddeholm M390 is known to take a fine edge and hold it! It also helped Carpenter to create CTS-204P, which is also quite similar. Enjoy it! The longevity of M390 is relatively impressive given how early it was in terms of a powder metallurgy stainless steel. The chromium rich matrix provides outstanding corrosion resistance. And if we take into account all the cutting tests we carried out we can also say that, in terms of performance, they are also similar. 20CV only has the advantage of more corrosion resistance over 3V, but in all the use my … Haven't tried ZDP-189 as of yet but am interested in a stretch with this steel. M390. The patent application for M390 was submitted in 1989 [4]. [5] Huth, S., H. Hill, and W. Theisen. It is one of the most wanted types of steel at the moment. Therefore, I did the same simple math with the Bohler-Uddeholm and Knife Steel Nerds data so that they can be easily compared. Your email address will not be published. The Best Pocket Knife For Your Money Informer. https://knifesteelnerds.com/2020/01/13/s35vn-steel-properties-and-how-to-heat-treat/. 98. The basis for designing M390 was to take K190 and modify it to have stainless levels of corrosion resistance [3]. In the early 1980s, Bohler steel introduced K190 steel which is a powder metallurgy version of D7 [3]. 4 (2010): 195-200. M390 has relatively high “chromium in solution” which is the primary factor that controls corrosion resistance apart from molybdenum and nitrogen. [6] http://www.kresslerknives.com/Messermagazin.pdf, [7] https://web.archive.org/web/20051127135836/http://www.timken.com:80/products/specialtysteel/engineering/tech_info/knifesteels.asp, [9] https://news.timken.com/2006-12-08-Timken-Completes-Sale-of-Timken-Latrobe-Steel-to-The-Watermill-Group-and-Hicks-Holdings, [10] https://web.archive.org/web/20090318072938/http://www.cartech.com:80/ssalloys.aspx, [11] https://web.archive.org/web/20090724045148/http://www.cartech.com:80/ssalloys.aspx, [12] https://web.archive.org/web/20100107063714/http://www.cartech.com:80/ssalloys.aspx, [13] https://www.businesswire.com/news/home/20110620005821/en/Carpenter-Technology-Acquire-Latrobe, [14] https://www.bladeforums.com/threads/was-m390-used-in-knives-later-than-20cv.1725021/#post-19703919, [17] https://bladeforums.com/threads/m390-super-steel.704854/page-2#post-7949980, [18] https://bladeforums.com/threads/m390-super-steel.704854/page-3#post-8368188, [19] https://bladeforums.com/threads/m390-vs-zdp-189-rope-cutting-informal-testing.774510/page-9#post-8692335, [20] https://www.bohler-edelstahl.com/app/uploads/sites/92/2019/09/M398En.pdf. So far I like it but have not used it much. Is the relatively low toughness of M390 at HRC 62 or so? New … Gekko 1509. report. Hey, at 20% chromium, it’s also really good at corrosion resistance! Knife Steels Crucible CPM D2, Latrobe DuraTech 20CV, Bohler-Uddeholm M390 Version 4.36. Its ease in sharpening is also good with soft abrasives, at least relative to its level of wear resistance. Advantages: Extremely high wear resistance and corrosion resistance. CPM 20CV is a martensitic steel, which refers to its hard crystalline structure with lens-shaped or lenticular grains. Metallurgy and Testing of Knives and Steel. 67% Upvoted. Advantages: Extremely high wear resistance and corrosion resistance. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! It also means that the overall carbide content isn’t raised relative to K190 so that toughness is not reduced. However, tungsten is more expensive than molybdenum, you have to use twice as much tungsten to get the same effect (because tungsten is a heavier element), and tungsten does not improve hardenability like molybdenum does. Nožířské oceli - ocele 20CV Nožířské oceli - ocele 20CV. Mouse over multi alloy graph bars to see exact values. It is not without precedent that tungsten would be contained in similar steels, as D6 has a tungsten addition. Take, for instance, CPM 20CV and Carpenter CTS-204P. This is a quick comparison between premium steels used in pocketknives. Martensite forms when austenite cools so quickly that the carbon in the steel supersaturates a special … M390 vs CTS-204P. Your email address will not be published. It’s still fairly new in the market but … This can be acceptable in knives as long as they do not have thin edge geometry and knives that are not subjected to high stresses or impacts. Required fields are marked *. These were the highest wear resistance cold work tool steels for several years before the introduction of powder metallurgy steel production in the early 1970s which allowed the design of even higher vanadium steels like 10V. In my corrosion resistance testing, M390 scored very well (I tested CTS-204P), better than S30V, S35VN, S90V, and SG2, and probably a bit better than S45VN. It's comparable to Bohler's M390 stainless steel or Carpenter's CTS-204P and, like those alloys, takes a mirrored finish well. Will the toughness of it be higher? These properties along with a working hardness in the low 60s HRC make 20CV a prime choice among custom and …
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