So I would choose S45VN for higher edge retention and corrosion resistance and S35VN for better toughness, depending on your desired properties. In choosing the best pocket knife you should pay particular attention to the type of steel used in the blade. Based on @Bohler communication the M390 steel is composed of: 1.9% of Carbon: Carbon is essential in all blades and knives, it gives more toughness, durability to the blade/knife, but the carbon as a component is susceptible to corrosion. For a fixed blade I could understand the toughness could come into play maybe?? This is expected due to ThermoCalc being an equilibrium calculation (infinite hold time). Notify me of follow-up comments by email. Checkout Deals of the Day on Amazon. The ratings are approximate and the actual corrosion resistance performance will vary based on the corrosive media, heat treatment, and surface finish. However, there are other steels that apparently will outperform ELMAX, stuff like S90V and M390. These special, custom and unique knives are considered to be the best folding knives in Russia. S30V also has a nitrogen addition [3], a point not often recognized since the nitrogen is not listed in the datasheet [4]. This puts S45VN more on par with 204P/M390/20CV as shown in this comparison chart of my previous corrosion experiments. a mix) of carbon and iron that is often enriched with other elements to improve certain characteristics depending on the desired … I wouldn’t say that S45VN is any more sensitive to heat treatment than any other steel. You can read more about cryo treatments here: Part 1, Part 2, and Part 3. I had a Cru wear pit at the Tang under the washers(somehow?) [1] Chilton’s iron age 226 (1983): p. vi. Best wheel for Ultra Premium (S110V, S90v, M390, etc) « on: January 24, 2019, 07:40:26 am » I'm ready to purchase a T-8, but I am in the initial stage of learning about different grinding materials for working on the higher end blades I have (S110V, S90v, M390, etc. See more S90V steel knives. 1. share. The S90V offers the same/close edge retention compared to the M390, but it has lower toughness, corrosion resistance, and is harder to sharpen. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! Quick info! S110V has a similar Mo content as well so it should still have better corrosion resistance than S45VN. I’m glad you found a steel that works for you. In @KnifeUser we decided to walk you through all the details about a knife, the steel used in it and the other components. If you’re a fan of the Knife GRINDER/Belt sander, according to BOHLER the M390 Steel is perfectly grindable, but let’s not forget, if the steel is perfect for grinding with a machine tool, it doesn’t mean it’s easy to sharpen with a sharpening stone. Nitrogen is not as prone to form chromium nitrides as carbon is to form chromium carbides, so nitrogen can often be added to steel for an increase in hardness without decreasing corrosion resistance. Based on @Bohler communication the M390 steel is composed of:. The M390 knife steel is identical to the CPM 20CV or the CTS-204P in comparison of hardness(62HRC). Blade Steel … To test the toughness of S45VN I did three different heat treatments, all of which utilized liquid nitrogen after the quench. A place to list and reference all Spyderco counterfeits, clones, and replicas that are found. Still in the range of xhp, elmax,3v? The equation puts S45VN at about 142% at 61 Rc, very close to the value provided by Crucible. M390. from carrying it for a couple weeks and not disassembling and cleaning it off (sweat I’m guessing). The results of these experiments (minus S45VN) were previously shown in this article. Crucible and Niagara collaborated to offer a steel with improved corrosion resistance without sacrificing other properties. Still in the range of xhp, elmax,3v? But in addition, it has better corrosion resistance as an evolution. Final refinement of the chemistry and Mill Production methods were developed by Bob Skibitski of Crucible. This has been killing me. The 2000°F austenitize in combination with cryo and a 400°F temper led to a good combination of hardness (61-62 Rc) and toughness along with low retained austenite. I will be writing a more in-depth history of S30V and S35VN in the future. Who uses it: Benchmade, Zero Tolerance. PLUS, it’s easier to grind and sharpen then either. It seems to be a popular opinion among some enthusiasts that S30V and S35VN are now old hat, so perhaps this new grade will attract them again. A freezer is not as effective at minimizing retained austenite but it is better than nothing. Steel type: M390 There are better steels suitable for each job. It seems like s45vn is going to be a really good fixed blade steel(5-6 inch)….IF heat treated correctly….. Lol. The previously shown retained austenite measurements showed only a small increased in RA by austenitizing at 2000°F, likely ruling out a strong effect of retained austenite. But not quite up to super steel status m390, s90v, s110v, 4v, m4? Check this great post by thefabricator.com SPOILER ALERT: a lot of GOOD science!). I found that the carbides were significantly finer by using the 2000°F austenitize which is a likely explanation for the improvement in toughness: While austenitizing temperature does lead to the dissolution of more carbide, this does not always lead to an improvement in toughness because grain growth is possible and with more carbon in solution there is a chance of embrittlement. I also adjusted the carbon content to maintain carbon “in solution” constant so that hardness is unchanged. The following chart shows C and Cr in solution for a range of PM vanadium stainless steels using ThermoCalc estimates with the recommended austenitizing temperature found in each datasheet: I heat treated S45VN by wrapping it in heat treating foil and heating it in an Evenheat furnace. I also think that S45VN is an upgrade over Elmax as it has similar edge retention but somewhat better potential hardness, corrosion resistance, toughness, and a finer carbide structure. 1.9% of Carbon: Carbon is essential in all blades and knives, it gives more toughness, durability to the blade/knife, but the carbon as a component is susceptible to corrosion. They perform really well. M390 is king and Elmax is a wannabe, also ran. If a further increase in hardness is desired for high edge retention or edge stability then temper between 300 and 350°F. Therefore, a niobium additions helps improve both toughness and corrosion resistance by increasing chromium in solution and refining the carbide size. The M390 STEEL is a popular premium steel that fits perfectly for knives, it offers all the specs to enjoy a high-end knife (high corrosion resistance, excellent edge retention, great toughness), and that explains the expensive part of the m390 steel knives.Truth to be said you won’t regret buying an M390 Knife! Thanks to John Dyess, Michael Foote, Xun Fan, and Mark Vanderwest for becoming Knife Steel Nerds Patreon supporters! Plus, we now offer the finest Custom Made Knives and Semi-Custom Made Knives on the web! Is there something about s35vn that would make it a superior folding knife steel? The increase in Cr in solution puts S45VN at a similar Cr-level to Elmax, but it is still somewhat below S110V and M390. Therefore a Mo addition can be used for stainless steels with a bit lower Cr for an improvement in corrosion resistance. 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 also boast nearly the toughness of s35vn. As shown the composition of M390 steel includes a lot of materials, which demonstrate the power of an M390 steel knife, it guarantees toughness, resistance and strength, it will be a great choice for hunting, camping or any outdoor usage. “Quick Stop” If you have no idea about “Rockwell Hardness” You must read this post then comeback! 0.3% of Manganese: Adds a … Perhaps even higher hardness could be obtained by austenitizing at yet higher temperatures. 0.7% of Silicon: Gives extra hardness to the steel, and keeps air bubbles from forming in the melting process. I have used nd carried a great many knives from many manufacturers, with more than a small variety of different steels - M390 and Elmax included. According to the chemical composition and the HRC of the steel, the CPM s90v Steel has the following features: CPM s90v Edge Retention: With a high presence of vanadium and carbon, s90v steel offers extreme edge retention (might be the best in the steel). The best place to find and buy the perfect knife, gear, accessories, and more.Choose from kitchen knives to pocket knives, outdoor, camping, and survival knives, Swiss Army Knives, key ring knives, multitools and kitchen cutlery. They are highly appreciated and rated among the knifelovers and knifecollectors all over the world. S90v has great wear resistance but would make a sub par chopper and m4 is a great overall steel but would make a bad diving knife. Ether you are a pro or an amateur in knives, you already heard of this rule: High edge retention = High strength = Hard to sharpen, so sharpening an M390 knife won’t be a perfect experience as grinding it. It features a 3.5" VG-10 hollow ground stainless steel blade that enjoys great edge retention and resistance to corrosion, which is further helped by the black treatment on the blade. S60V was a modification of the common stainless grade 440C by adding 5.5% vanadium with a corresponding increase in carbon. Steel is essentially an alloy (i.e. I saw s30v as a good mid range folding knife steel and s35 as a good mid range fixed(5-6 inch) blade steel, but nothing really stands out about them. So was crucible out to create a new premium steel? “Multicomponent diffusional reactions in tool steels: Experiment and Theory.” PhD diss., KTH Royal Institute of Technology, 2012. In this section, we’re going to compare our steel with other steels, and for this, I use four criteria; Edge Retention, Corrosion resistance, Ease of Sharpness, and Toughness, and I use a scale or note from 1 to 10.
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