102, pp. I don’t know why the Bohler and Latrobe values are higher, however. It is similar to D2, but because it contains more chromium, can achieve the same hardness but also be resistant to corrosion. I'd imagine because it contains less Vanadium? For a while I had a toughness chart which showed a relatively high value of about 8-9 ft-lbs for M390 at ~62 Rc in our toughness testing which put it close to steels like S35VN which have significantly less carbide and therefore would be expected to have superior toughness. The Latrobe data does not state the hardness values. Interesting, thanks for your time and feedback. M390 vs S90V (CPM S90V) M390 Benchmade 20cv is outstanding in my book. I'd be interested in info from hands on field performance between the 2 steels. Later there were other modifications of D3 such as D4 which had higher molybdenum for greater “hardenability” meaning it could be quenched more slowly and still achieve full hardness. share. 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. M390 / CPM 20CV is a PM stainless steel that offers good wear resistance with excellent corrosion resistance through the use of high chromium and vanadium content. For example, with Crucible’s charpy c-notch toughness testing (not the same as our specimens), 15V (high carbide) toughness increases from 8 to 13 ft-lbs by dropping hardness from 64 to 58 Rc. Thus, its wear and tear resistant, its corrosion resistant and its tough metal. It also has some pretty respectable toughness, and can take a good hard beating. That is to say: you won't get very far by using a simple Arkansas stone. Latrobe steel in Pennsylvania, later purchased by Crucible Industries, created what they called Duratech 20CV, essentially an American version of M390. To see if I was right, I enlisted the help of Shawn Houston to heat treat some M390 for me because I was unable to obtain liquid nitrogen because of COVID-19. Má vysokou abrazivdornost, korozní odolnost, nárazovou houževnatost a výbornou leštitelnost. Bohler reports that M390 has about 18% chromium carbide and 2.5% vanadium carbide [20], and in my metallography I found about 22% carbide. 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. M390. The higher tempering temperature was necessary to achieve a similar hardness to the original samples that were tempered at only 365°F. M390 vs S90V (CPM S90V) M390 Benchmade 20cv is outstanding in my book. They began surface grinding the material to avoid that issue. So far I like it but have not used it much. Go get yourself a 20CV PM2 just saw one sell on ebay yesterday for $175.00 then use it and you will see. You can read more about the development of D3 and D2 in this article. CPM 20CV Steel is Crucible’s answer to Bohler’s M390 stainless steel. The 20CV will be stronger because of the vanadium, which being a proprietary steel, will cost more than the loveless 440C. Steel Rating SV $ TV $ Media; Shirogorov HatiOn Zero ... TV $ Media; Shirogorov HatiOn Zero: M390: B- : 2nd owner, sharpened by prior owner, light carry marks: 475 SOLD: 500 SOLD: Authenticity Vid Vid2: Sharp By Design Evo Typhoon bowie black out with marbled CF inlay : M390: A: like new: WITHDRAWN: WITHDRAWN: Vid: WingMan EDC MDD-K Model 1 standard: M390… Alpha Knife Supply tells me that they had issues with the material from the HIP “can” used in the powder metallurgy process being left on the steel, which is a low carbon stainless steel. 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. save. Select steels from the Interactive Knife Steel Composition … Take, for instance, CPM 20CV and Carpenter CTS-204P. I do not have negative things to say about M390 or CTS-204P they are both great steel 20CV however chemically similar is better. You can compare with many other steels in this article which contains all of my micrographs. Knife Magazine - Site by Epic Nine. From specs, they seem to be almost exactly the same steel. In the Comparison on cts 204p vs m390 steel that M390 is first and foremost an awesome edge retention steel. Powder Metallurgy Knife Steels. The components and production process are similar. CPM 20CV is a unique tool steel made by the Crucible Particle Metallurgy Process. This led to reports in odd surface behavior such as low hardness readings even though the edge was fully hard. 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. © 2020. I have been waiting to collect my thoughts before I gave my opinion on the M390 issue that has become very popular. Zero Tolerance Hinderer Pocketknife; 3.5-Inch CPM 20CV Steel Blade, KVT Ball-Bearing Opening System, Flipper, Reversible Deep Carry Clip, Titanium Handle, Made in USA (0562TI) 4.5 out of 5 stars 54. At the time of posting it’s about 30 within good HRC vs. about 65 that are below. 20CV steel retains its sharpness well, is stainless and very hard. 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. It was found that vanadium carbides are extremely hard and therefore contribute greatly to wear resistance with high speed steels. maxamet steel vs m390. It's comparable to Bohler's M390 stainless steel or Carpenter's CTS-204P and, like those alloys, takes a mirrored finish well. M390. Notify me of follow-up comments by email. The patent application for M390 was submitted in 1989 [4]. Edge retention testing is continuing, we have now tested 18 different steels, and four of those steels with multiple heat treatments. M390 was developed by Bohler in the late 1980s as a modification to K190, which in turn was a powder metallurgy version of D7 tool steel. Despite the Bohler and Latrobe numbers seeming to confirm a higher result I believe the Knife Steel Nerds number is more reliable (I know, I’m biased). Therefore, even if a higher impact toughness value is measured I would not recommend heat treating the steel in that way. The Bareknuckle includes a deep-carry pocketclip for left- or right-handed carry. The chromium rich matrix provides outstanding corrosion resistance. Latrobe suggested 20CV instead and SOG had better results with the manufacturability of 20CV, and contributed knives for CATRA testing by Latrobe. The general lack of M390 in knives was presumably because Bohler was more focused on selling the steel to the plastics industry. $179.99 Steel: M390; Handle: G10 ; Full length: 8.00" Blade length: 3.50" Blade thickness: 0.12" Add to cart. It might be a bit harder to sharpen (we recommend diamond stones) but once sharpened it retains its … Tungsten was very expensive and only available to mine in certain countries and so during war it could be difficult to obtain. In my experience, M390is truly a super steel. If you’re looking for all all-around best knife steel, you’d be hard-pressed to find one better than Bohler Uddeholm M390. Is that because of what you said about austenitizing it at 2100°F is good but then it drops at 2150°F and that is a small window to ace every time? Known as a super-steel, M390 is a premium powdered stainless steel. It just takes more work than S90V to get the same results so I'd bet this is what some are seeing. While 3V (low carbide) increases from 40 to 85 ft-lbs by dropping hardness from 62 to 58 Rc. Despite the relatively high chromium in K190, it is not stainless, you can read why in this article on D2 corrosion resistance. It did not do quite as well as S110V or LC200N. The powder is then placed into a canister for “hot isostatic pressing” (HIP) where the steel is heated to high temperature under pressure to create a solid ingot. M390 Steel – History and Properties (and 20CV and 204P) Source: Knife Steel Nerds. This thread is archived. CPM 20CV is a unique tool steel made by the Crucible Particle Metallurgy Process. Tungsten was very expensive and only available to mine in certain countries and so during war it could be difficult … I wrote about how powder metallurgy steel … This Griptillian is equipped with a blade made of CPM 20CV steel. Below is a summary of my corrosion resistance test where a higher score means that it rusted less in a 1% saltwater test. The high volume of chromium carbide means that M390 has a larger carbide structure than those steels, however. [3] Kulmburg, A., and B. Hribernik. Come to Patreon if you want updates on testing as it is completed. The ingot has a very small level of porosity, which is eliminated in the forging and rolling process. This is true when using aluminum oxide abrasives, anyway. M390 vs 20CV vs 204P – 3rd Generation Powder Metallurgy Technology? As stated by Bohler, the design target for M390 was to have high wear resistance and corrosion resistance, though they stated that high toughness is not particularly necessary for plastics processing. Report Save. 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. Mouse over multi alloy graph bars to see exact values. What Is Cts 204p Steel It Good For Knives Knife User. 2010 was especially the year when M390 started to make a splash in the USA, with announced knives from Benchmade [15] and Kershaw [16], and the steel was available in full sheets from Bohler-Uddeholm USA [17][18] and in smaller sizes from Alpha Knife Supply [19]. ). FREE Shipping by Amazon . Knife Steel Chart Mobile: Mouse over element names to get quick help on its effects in the alloy. We now have over 200 supporters! It is a bit puzzling why the tungsten was added to M390 when it was not present in the K190. M390 vs 20CV vs 204P – 3rd Generation Powder Metallurgy Technology? level 2 <(<.<)<__^(^.^)^__>(>.>)> Original Poster 2 years ago. CTS-204P is made by the USA-based Carpenter Technology Corporation and CPM-20CV is manufactured by Crucible Industries. “Ferrous alloys and abrasive-resistant articles made therefrom.” U.S. Patent 2,575,219, issued November 13, 1951. Its … KNIFE Magazine is an oversized, full color, glossy print publication — 50% larger than a standard magazine and dedicated to serving collectors, knifemakers and other enthusiasts. In fact, M390 is sometimes known as “stainless K190” [5]. CPM 20CV is a steel created by Crucible to be excellent at resisting wear and corrosion, balanced with good toughness. What if M390 is at HRC 60? M390 vs CTS-204P. Latrobe does not have their own powder metallurgy manufacturing facilities so presumably this means that Crucible was producing 20CV for Latrobe before the purchase of Latrobe by Carpenter. Advantages: Extremely high wear resistance and corrosion resistance. I've just … 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. These facts alone should tell you something. Home > Knives > Steels. 4 (2010): 195-200. “Corrosion of stainless PM tool steels: Interpretation of current density potential curves in acid environments: Dedicated to Prof. em. CPM 20CV: CPM 20CV is a highly wear-resistant, powder metallurgy stainless steel, analogous to Bohler M390 and CTS-204P, and offers some of the best corrosion resistance and wear resistance in combination with a relative ease of sharpening. Excess retained austenite also makes deburring in sharpening much more challenging. Hans Berns on the occasion of his 75th birthday.” HTM Journal of Heat Treatment and Materials 65, no.
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