[2] Pinnow, Kenneth E., William Stasko, and John Hauser. Overall it’s a popular choice thanks to its high wear and corrosion resistance, it’s premium steel and because of that its a great pick for high end or limited-edition knives. The lower chromium content of those steels means they have more vanadium carbide rather than chromium carbide, so they are expected to have similar edge retention with lower carbide volume. Better for what? He also has a custom heat treat protocol, Your email address will not be published. ). With significant amounts of Chromium, Molybdenum, Vanadium, and Tungsten, these steels are 100% ready for action. Since the steel is brand new and largely not available we couldn’t do any experimental comparisons even if we had the money and time to do so. } This is a modification of their older PM stainless M390 which was released in the late 1980’s. After atomization, the two carbide types (vanadium and chromium) are similar in size, but during the HIP … So M398 doesn’t appear to be over-performing relative to its composition and carbide content. “Alternative materials for high-temperature and high-pressure valves.” (2010). However, quite a bit of information is available in the datasheet, allowing us to have a pretty good understanding of the properties that the steel has. The more carbide a steel has the better the wear resistance and the worse the toughness is. [3] http://www.crucible.com/PDFs/DataSheets2010/dsS30Vv1%202010.pdf, [4] http://www.crucible.com/PDFs/DataSheets2010/Data%20Sheet%204V.pdf, [5] http://www.bohler-bleche.com/media/productdb/downloads/K890DE.pdf, [6] https://www.bohler-edelstahl.com/media/K490DE.pdf, [7] https://www.bohler-edelstahl.com/media/productdb/downloads/K390DE.pdf. Ankerson can correct me as … All of the values are relative to 440C at 58-59 Rc which would be “100” on the chart: Carbide values from [1][2][3][9][10][11][12][13]. “New Bohler powder metallurgy high speed steel with excellent hot hardness.” In Proc. Carbon steel grade equivalents table for American ASTM, ASME, and SAE to Europe, Germany, Italy, France, and Japan. “Wear and corrosion resistant PM tool steels for advanced bearing applications.” In Bearing steel technology. Traditional pattern? I disagree, harder to sharpen issues are not taken out of the equation ... No I doubt they forget sharpening, and non powered equipment... Basically both are super steels, if you want to give up corrosion resistance and ease of sharpening in exchange for even better edge holding go for K390, if you want to give up some edge holding in exchange for corrosion resistance and some ease of sharpening go M390, if it were me I'd go K390, just because I don't have anything in K390 yet, and have several knives in M390 (which I like a lot) I do have two custom fixed blades (one 5" blade one 4.5") in CPM-10V which as mentioned is similar and they are excellent. https://www.patreon.com/Knifesteelnerds, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). "@context": "http://schema.org", 2002. M398 was a relatively simple modification of M390 and I can’t help but think that a more optimized version could be made. [9] Kajinic, Alqjz, Robert B. Dixon, and Brian A. Hann. Utility, chopper, camp, self defense? BÖHLER M390 MICROCLEAN is a martensitic chromium steel produced with powder metallurgy. "@type": "Table", And M398 has a relatively poor ratio of vanadium carbide to chromium carbide because of its high chromium content. CPM 15V, known for its excessive amount of wear resistance, has 23-25% carbide volume of all vanadium carbide, while M398 has a full 5% more than 15V. Your email address will not be published. He is a YouTuber from the United States. Paper wheels, Wicked Edge, and Edge Pro can sharpen absolutely any steel to a hair popping edge. K390,k294, 10v are all similar in composition. And the datasheet shows that the toughness of M398 is only about a third of M390, though at somewhat higher hardness: Comparing with other Bohler steels, you can see that the toughness of M398 is quite low. If you need more information, contact us today! M390 itself is a little less tough than K390, which is a high wear resistance non-stainless steel comparable to CPM 10V. Excellent performance with both, coarse and high polished edges. For the steels that we have experimental values for, these predictions are close. The M390 knife steel is identical to the CPM 20CV or the CTS-204P in comparison of hardness (62HRC). What does better knife mean? Larrin, CTS-204P Bohler M390, CTS-204P, and CPM-20CV are all essentially the same steel and sport a near identical composition. Those comparable grades are similar, along with M390, because they combine a high Cr content (17% or greater) along with high vanadium (4% or greater). of the 6 th International Tooling Conference, Karlstad, Sweden. We would love to help you find what you are looking for. The end result is that Uddeholm toughness values are somewhat lower than those for Bohler, particularly for low carbide volumes: You can also see that Elmax and Vanax steels underperform the non-stainless trendline of Vanadis 4 Extra (V4E) and Vanadis 8. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! The high Cr is significant in part because it reduces the amount of “vanadium carbide” that is present in the steel as opposed to “chromium carbide.” The vanadium carbide is harder and therefore contributes more to wear resistance and edge retention. To see how the different carbide types and carbide fraction affects edge retention read this article. Fine grained alloy, popular choice for high end folders and small fixed blades. BENEFIT IN RESPECT OF VERSATILITY AND PERFORMANCE The change in composition is primarily an increase in vanadium, from 4% to 7.2%, with a corresponding increase in carbon to maintain the same level of hardness after heat treatment. The Bohler toughness values can perhaps be compared to Uddeholm if shifted down to compensate for the difference in direction. IMO, the M390 with the much greater chromium content will be much more stain resistant. And for Vanax I showed only the total carbide volume because I didn’t want to add another column for its vanadium nitrides, which are different than vanadium carbides. Bohler has recently released a new stainless powder metallurgy steel – M398, I first learned about it here. It shows generically whether steels are better or worse than average. Folder? It has better edge holding than M4 and is tougher than A11. M390 has only slightly lower toughness than K390 with similar carbide volume (though K390 was tested at 62 Rc). Discussion in 'General Knife Discussion' started by ridnovir, Feb 28, 2013. For all of these steels I assumed that the chromium carbide is “vanadium-enriched” which increases the hardness of the carbide somewhat. [10] Kajinic, Alojz, Andrzej Wojcieszynski, and Maria Sawford. Thanks to Michael Poor and Connor Kaspar for becoming Knife Steel Nerds Patreon supporters! We could simply predict based on carbide volume alone, but that would be too easy. “Corrosion resistant, high vanadium, powder metallurgy tool steel articles with improved metal to metal wear resistance and a method for producing the same.” U.S. Patent 5,936,169, issued August 10, 1999. However, after all of these comparisons I can’t help but be disappointed that the steel companies appear to still be stuck on very high carbide volume stainless steels when using powder metallurgy. But if Bohler pushes out M398 more broadly it will be interesting to see how knifemakers utilize the steel for applications that benefit from high wear resistance and edge retention. These comparisons will have a range of accuracy. However, Bohler does this test in the “longitudinal direction” while Uddeholm does the test in the “transverse direction.” Those directions are relative to the direction the steel is rolled. It’s hard to say since it’s never existed as a commercial product. All of These Steels Have a Lot of Carbide. Triple handmade.com has a super trapper in M398 for sale on his site. Metallurgy and Testing of Knives and Steel. Minor surprises are usually in the area of toughness, in my previous comparison of CATRA edge retention steels usually end up where you expect them to be based on their carbide content. [12] Almström, Linda, and Camilla Söderström. There is no 3V or Vanadis 4 Extra equivalent stainless steel with lower carbide volume for better toughness. That is to say: you won't get very far by using a simple Arkansas stone. Fortunately for us, the carbide fractions of M398 and M390 are shown in the datasheet so we don’t have to estimate: The original M390 has a reported carbide volume of 20.5% and the new M398 has about 30%, so there has been an increase in carbide of almost 50%.

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