cpm s45vn vs s30v

december 1, 2020

I didn't really plan it that way, but it works out that this edge type, when combined with a relatively steep sharpening angle of 17 degrees per side gives a really tough sharpened edge. According to the specs, toughness is slightly decreased, CPM S45VN has 11lbs on C notch, vs. 12lbs on S35vn steel, but better than 10lbs on earlier S30v steel. $269.95. I’ve been a long time user of Chris Reeve Knives and even have my faithful first regular Sebenza in BG42 steel. As shown in the datasheet, S30V can reach at least 64 Rc when using cold treatments, and can easily be tempered down to the 58-61 Rc range common for many knives. in these two. The early versions of the steel were first tested by Chris Reeve Knives making that company very significant to what the final product became. 5 out of 5 stars (1) 1 product ratings - Spyderco Jerry Brouwer CPM-S30V Green G-10 (Newest CQI Version) C232GTIP. A Knifemakers Perspective S45VNSelecting a steel to use in a knife is a balance between the intended use (features required), the cost of the steel (price point), and the difficulty both to cut, grind and heat treat the steel. $195.00 +$5.00 shipping. CPM S30V 10.0 ft. lbs. See this article to learn about corrosion resistance. Perhaps the toughness could be improved to 7-8 ft-lbs at 1-2 Rc higher hardness if using 2025-2050°F and 400°F: The corrosion resistance of S30V and the similar S35VN have been found to be better than CPM-154, in a range I would call “above average.” The corrosion resistance has been improved somewhat with the new S45VN, but S30V is good enough for many knives. S90V has a better edge retention but let's all be honest, edge retention for most of us is just numbers on a piece of paper. "Corrosion Resistance Freeman also said that “I think the main advantage of S45VN is the increased corrosion resistance. You can read more about carbide types and how elements interact to lead to different amounts in this article on carbides. The corrosion resistance of S30V and the similar S35VN have been found to be better than CPM-154, in a range I would call “above average.” The corrosion resistance has been improved somewhat with the new S45VN, but S30V is good enough for many knives. The carbide structure of S30V was finer than the common 154CM (BG42 is similar) because of powder metallurgy. While corrosion resistance is important a knife's key role is cutting hence holding its edges is a vital feature. Possibly due to a 2,000F AUS temperature that gives a higher hardness, among other things. However, in testing of that steel Chris Reeve Knives wanted more wear resistance to better differentiate from BG42, leading to an increase in vanadium up to the final 4%. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! Eventually though, CRK introduced S30V steel, which Chris was directly involved … We now have initial edge retention results from 32 steels on Patreon, so if you want an early look at that come join us on Patreon. S30V gained wide usage in a relatively short period of time. Winkler Highland Hatchet - Curly Oak Tomahawk, Chris Reeve Large Sebenza 21 Tanto - Micarta Inlay Folding Knife, Kurt Merriken Custom 3" Phantom San Mai Damascus, Brian Tighe - Tighe Down Integral - RWL34 & Carbon Fiber Inlay, Hinderer Extreme Duty Pen Copper - EDP Tactical Pen, Tuff Writer Precision Press Flamed Titanium Tactical Pen, Download the Crudible CPM S45VN Steel Datasheet. Along the same lines, CPM S45VN has slightly better edge retention in CATRA test results(all % numbers relative to AISI 440C steel) when compared to CPM S35VN steel, 143% vs… Top. 7. It was designed in conjunction with knife companies, knifemakers, and heat treaters to learn the properties that they wanted in a knife steel. I think this is due to the supporting material behind the edge. Apart from the increase in Cr, S45VN also has a 0.15% nitrogen addition. S45VN uses a similar chemical formula but with a rebalance of the percentage compositions of the elements. CPM S35VN. 5. Corrosion resistance is “above average” and has been sufficient for many knives that have been released over the almost 20 years S30V has been available. Crucible started with 154CM as their basis, replacing 2% Mo with 2% vanadium. CPM-S30V. The addition of hard carbides to the steel makes it the best option among manufacturers of stainless steel knives. The resulting edge retention is better than steels like Elmax, S35VN, CPM-154, and BG42, though a bit worse than S90V and M390. The S30V sample I tested was austenitized at 2000°F and tempered at 500°F. The new S45VN steel offers corrosion resistance like never before. 21 (1983): 53. Summary and Conclusions. 154CM was designed for bearings, and was essentially a modification of 440C by reducing the chromium (Cr) by ~3% and adding 4% molybdenum (Mo). this article to learn about corrosion resistance, Toughness – improved because of a small reduction in carbide content along with using powder metallurgy for finer carbides, Edge retention – increased vanadium for hard vanadium carbides led to increased wear resistance and therefore slicing edge retention, Corrosion resistance – With the vanadium addition, less chromium carbide is formed in the S30V leading to improved corrosion resistance relative to BG42 and 154CM. S60V was the first CPM steel produced by the company through the modification of common stainless grade 440C steel by increasing the composition of vanadium with a corresponding increase of carbon elements.CPM technology was used in the manufacture of homogeneous steel through the even distribution of carbides in the blade. S30V and S35VN are very similar for corrosion resistance. Your email address will not be published. Add in the machined "grooves" on the bevels, and the edge thickness can be .050" prior to sharpening. Chromium and vanadium both compete to form carbides. 4% S90V. So I think that 20CV would probably be the best choice for Spyderco to use if production costs were competitive with S30V or S45VN. By Larry Connelley When looking at quality American-made knives, you'll notice that S35VN and S30V steel are two of the more popular steels for knife blades. CPM SPY27 is a steel produced by Crucible exclusively for Spyderco. Freeman mentioned, “Not a knock on any other CPM steels, but so far this seems "cleaner", meaning that it gives a very uniform surface appearance across a large surface area. It sharpens easier and is cheaper while still having a pretty great edge retention. I would argue that S30V is better for every practical need. Steels have varying levels of difficulty working the steel, can require specialized tools and exacting heat treatment.S45VN fits the bill for high-end knifemakers that require excellent edge retention and corrosion resistance that is relatively easy to work. Crucible developed several powder metallurgy steels including 10V, S60V (formerly 440V) and S90V (formerly 420V), but none of them really gained wide use in knives. Exhibiting very good edge retention, corrosion resistance, and sharpenability, S30V is utilized by a variety of makers for its … CPM-20CV. If it costs the same as S30V/S35VN I could see a use for it, if its 10-20% more expensive, than we're in the price range of 20CV/M390. vivi Member … Hey guys.. do you have a list of blade steels in order of edge retainability.. The increase in Mo from 1% in S90V up to 2% in S30V provided an increase in corrosion resistance with the relatively low 14% Cr. It is a step forward from S35VN but its improvements are incremental better not orders of magnitude better. As seen in the formula composition, S45VN has a higher chromium content as compared to the S35VN. Powder metallurgy allowed higher alloy steels and finer microstructures because of the rapid solidification process. 154CM 2.5 ft. lbs. As for edge finishing, I have been going with a 100 grit, then a 220 grit, then a 400 grit at 17 degrees per side, then a buffing wheel with green chrome to finish. Enter your email address to subscribe to this blog and receive notifications of new posts by email. The addition of niobium is reflected with the addition of N in the name which is absent in the S30V. Another change to S30V is that an intentional nitrogen addition was made of about 0.2%, which was made to improve corrosion resistance but also means improved hardening when heat treating. https://www.patreon.com/Knifesteelnerds, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). S30V continues to be the benchmark other stainless knife steels are compared to. The CPM process used enhances the production standardized, high-quality steel with superior dimensional solidity, toughness, and machinability.Comparison Between S45VN and S35VN, Composition Both S30V and S35VN steel are made with the same carbon and chrome content, and from various tests, both steels provide the same edge retention and corrosion … Design of S45VN Steel – Nitrogen. You can read more about what nitrogen additions do in this article on nitrogen additions as well as this article on S45VN. I really would like to try out SPY-27, that looks like an interesting steel also. UK Penknife™ Red G-10 CPM S30V Exclusive. CPM S35VN Steel Review Chris Reeve Knives PacificWhen Crucible Industries introduced its CPM S30V steel, blade-smiths and knife-lovers alike fell in love with it; the quality wear resistance, toughness, and machinability offered by the steel was equal to none other. It's good stuff and I have, make and use S30V blades and haven't had big problems with chipping, but I don't chop cinder blocks either. Carbides are hard particles in steel that add to wear resistance but detract from toughness. Therefore, having only vanadium carbides means a better wear resistance-toughness balance. “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 5,679,908, issued October 21, 1997. Metallurgy and Testing of Knives and Steel. S35VN was released in 2009 as a modification of S30V to have superior toughness and … While various manufacturers have already put out the S45VN knife in the markets, it is bound to be more resistant to corrosion and wear as well have tough on edge retention. The replacement of vanadium and carbon with niobium and nitrogen produces an excellent combination of wear and corrosion resistance, edge retention, and toughness making this the ideal choice in the manufacture of knives. Overall, I'm pleased with it, and more importantly, my customers are satisfied. As described in the S45VN article, nitrogen also decreases the chromium carbide content while increasing the vanadium carbide content, though I’m not sure that was recognized at the time that S30V was designed. CPM = Cruidible Powder Metallurgy Powder steel is a technology that was invented to allow the … Its composition has been altered to create more chromium carbides, while also allowing free chromium compounds in the composition. 29% CPM-154. With increased carbon content and less vanadium, S45VN holds an edge longer as compared to its predecessors. I won’t say equivalent but close, CPM 154 is close to the S30V in the balance between hardness, corrosion resistance, wear resistance, and toughness, but still the S30V is better in edge retention and corrosion resistance, the second equivalent for our CPM154 would be the 154 CM(since it was developed based on it), and of course CPM … A cryo treatment may be added between tempers. It gives a nice sharp bright and mirror-polished finish on the edge. Yojimbo™ 2 Natural G-10 CPM M4 Exclusive. This is in reference to surface grinding water jet cut blanks to final thickness. [5] Pinnow, Kenneth, William Stasko, and John Hauser. 5. Notify me of follow-up comments by email. So to design a more balanced steel than S90V with improved toughness and grindability, a reduction in carbon and vanadium was necessary. $217.95. S30V is a knife steel produced by Crucible, released at the end of 2001 [1]. The lead development metallurgist was Dick Barber who used the history of stainless steels developed by Crucible to inform the designs that were tried, including important details like the amount of chromium used, how much vanadium to achieve the right balance of properties. Spartan Blades, along with other tactical knife manufacturers, have embraced the high performance CPM steels for their knives. CPM S45VN is the updated version of CPM-S35VN. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition. Chris said that if Crucible made something better they would buy it. 3. It's about the same edge retention as S30V but with better toughness and corrosion resistance. We will be looking into that more in the future. $329.95. Further fast-quench and cold treatment are recommended at 400°F temperatures depending on the desired levels of hardness. And of course, this varies along the edge from machined peak to valley. In 1970, Crucible Industries pioneered in the production of powder metallurgy tool steels. [4] Chilton’s iron age 226, no. Molybdenum improves corrosion resistance, as mentioned earlier in connection with 154CM. The more the carbides present the tougher and brittle the steel. Niobium carbides are also hard hence used in place of vanadium to form higher wear resistance. Below is a table summarizing the resulting properties including the amount of chromium carbide (M7C3), vanadium carbide (MC), measured toughness (higher is better) wear resistance in a crossed-cylinder wear test (higher is better), and corrosion measured in a 10% boiling acetic acid solution (lower is better): So with all of those lessons learned, it was known that a lower chromium content would allow vanadium to go further in terms of its contribution to wear resistance. S30V quickly became a favorite for knife manufacturers in the 2000s. ATS34 might need to be touched up a bit more often, but S30V will be a little harder to sharpen.

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