Corrosion Resistance: The CPM M4 corrosion resistance isn't the best as the edge retention; with 4% of chromium, it offers decent corrosion resistance. Blade HQ opines that CPM-3V and -4V are, "perfect blade steel for a fixed blade knife" because they score high in edge retention and toughness, with medium corrosion resistance and ease of sharpening. Cruwear is dream to sharpen and in my estimation has edge retention on par with S30V. Bark River Knives: Essential EDC - CPM M4. This is even better than non-stainless steels that are well regarded in terms of toughness such as CPM-M4 and A2. NW Montana. CPM 4V will have all the vanadium carbides but will be tougher and operate with a . I doubt many of us could distinguish the 2. The only drawback to 4V is that it is not as corrosion/stain resistant as 3V. 1 - CRK Large Inkosi Insingo/ Black Micarta Inlays. CPM 4V is a powder metal tool steel with an outstanding combination of properties including high impact toughness and very good wear resistance. 1 - CRK Umnumzaan. I don't remember the hardness of the data sheets I was looking at when spec'ing a 5" camp knife working with a forum knife maker who did his own heat treats. CPM Rex M4 HC offers improved cutting tool life compared to conventionally-wrought M1, M2, M7 and other lower-alloyed high speed steels. Vanadis 4 Extra is slightly different than CPM-4V which may be a borderline case but I didn't have any Vanadis 4 Extra so that made that decision easier. IIRC, some of the guys in Bladesports who have been using CPM M4 in their competition choppers are leaning towards 4V now. #5. CPM 4V Powder Metal Tool Steel. CPM 4V should be considered for applications where a higher attainable hardness and additional abrasion resistance is required than can be offered by CPM 3V. What it is: CPM M4 is a "Crucible Particle Metallurgy" carbon tool steel, widely regarded as a "super steel" for its properties and performance. 17 's in 12 different steels. Powder metallurgy steels with low vanadium content like CPM-1V and Z-Tuff/CD#1 have extremely high toughness. This is even better than non-stainless steels that are well regarded in terms of toughness such as CPM-M4 and A2. #5. M4 seems to be all about getting a nice edge and keeping it but it can be hard to get it. A large volume of hard vanadium carbides provides the high wear resistance. M4 is more wear resistant and holds an edge longer and takes a little longer to sharpen. The video has discussion about to. The Cruwear is going to be a little more stain resitant and have less wear resitants so it will be easier to sharpen than M4. The equivalent of CPM MagnaCut can be CPM 4V, which is non-stainless steel. . Advantages: Relative toughness, wear resistance. Most of these steels are carbon steels, except for CPM MagnaCut (the fancy steel cooked up specifically for knives by Dr. Thomas), which has excellent corrosion resistance. CPM 3V will be more prone to edge rolling at the lower cutting geometries . CPM 3V provides impact toughness approaching that of S7 and wear resistance higher than D2. The video has discussion about to. CPM 1-V has shock resistance close to S-7 and wear resistance close to A-2. 10V offers almost three times the wear resistance of 4V. As to toughness of the two they are almost indetical in published Charpy tests and both and both fall between 01 and A2 for toughness. CPM-M4. I have a new knife in CPM-M4 hardened to 64-65 HRc. CPM Rex M4 HC also excels in cold work tooling applications, where it provides better toughness and wear resistance than high-carbon, high-chromium die steels such as D2 and D3. Advantages: Relative toughness, wear resistance. May 3, 2018. . Can anyone with experience, or knowledge please tell me about these steels? CPM 4V is a more available USA copy of the European Vanadis 4 Extra. CPM 4V(Crucible)- Crucible CPM alloy. From the Knife Steel Database : As Crucible states it has high impact toughness and wear resistance and should be considered for the applications where higher attainable hardness and wear resistance are. CPM 4V steel Wear resistance Like any other hard steel, CPM 4V offers excellent wear resistance. Disadvantages: Relatively more difficult to sharpen than CPM 3V and predecessor tool steels like A2, not as tough as CPM 3V or CPM 4V. 1 - CRK Small Sebenza 31/Macassar Ebony Inlays. Feb 15, 2018. Powder metallurgy steels with low vanadium content like CPM-1V and Z-Tuff/CD#1 have extremely high toughness. 1 - CRK Large Sebenza 31/Box Elder Inlays. CPM 9V Powder Metal Tool Steel. It's very close to CPM 4V and I've had good luck with 4V in terms of wear resistance and edge holding. Heat at a rate not exceeding 400F per hour (222C per hour) to 1600-1650F (871-899C), and hold at temperature for 1 hour per inch of maximum thickness; 2 hours minimum. cpM 4 V At the November Fabtech Show in Chicago, Crucible ln- dustries and Latrobe Specialty Steel Distribution introduced CPM 4\P. CPM 4V joins forces with the Crucible Killer vs family of CPM IV, CPM 3V, CPM M4, CPM 9\/, CPM 1 OV, and CPM 15V to cover any difficult cold work tooling application. CPM 9V is a powder metal tool steel that provides very high wear resistance in combination with high impact toughness. desired compared to 3V. I thought it would be too brittle, but it's proving to be very tough, as well . M4 is definitely not stainless and needs a bit more care than Cruwear. Re: REX45 vs. CPM 4V. The performance of each steel, against each characteristic, is scored on a 1 - 10 . CPM 4V should be considered for service in fine blanking, powder compaction tools, for processing high-strength low-alloy (HSLA) steels, advanced high-strength steels (AHSS) and applications where a . Based on my experiences with D2, cruwear should be more rust resistant than M4 and M4 should be a little tougher in impact resistance. I got the Vanadis 4 steel. CPM 4V is a powder metal tool steel with an outstanding combination of properties including high impact toughness and very good wear resistance. CPM M4 VS 3V 3V offers better corrosion resistance and lower edge retention compared to the M4. CPM M4. High Alloy Tool Steel and High Speed Steel Ratings Stainless Steels . Relative Properties Physical Properties Density: 0.278 lb/in3 (7700 kg/m3) Specific Heat: 0.11 Btu/lb/F (460 J/kgC) Modulus of Elasticity: 30x106 psi (207 GPa) Ready to grab a Para 3 in Orange REX45, or Red CPM 4V. Great for all kinds of knives. 4V is much . MagnaCut and 4V steel both provide the same level of edge retention. Very similar to Bohler-Uddeholm Vanadis 4E steel. CPM 4V steel Hardness CPM 4V hardness is 64HRC which is very impressive. The short blade is stout, with a deep belly, perfect for slicing. CPM M4. The S30V looks about right based on others' tests. My favorites of the high edge retention group are Vanadis 8 and CPM-10V. The best steels with balanced properties include 4V/Vanadis4E, CPM-CruWear, and CPM-M4. The Bark River Knives Essential is an EDC-size knife specifically designed to be compact -- a great cutter and comfortable in the hand.. Cruwear is not supposed to be stainless but it almost seems it in my uses. High Alloy Tool Steel and High Speed Steel Ratings. If memory serves, M4 responds well to powder metallurgy so the CPM version stays together (toughness) pretty decent, in real world scenarios. But really, any comparison has to specify the hardness, otherwise it's an apples/oranges thing. CPM 4V should be considered for service in fine blanking, powder compaction tools, for processing high-strength low-alloy (HSLA) steels, advanced high-strength steels (AHSS) and applications where a . CPM 9V contains less carbon and vanadium than CPM 10V, which results in a lower attainable hardness, slightly lower wear resistance, but a significant increase in toughness. CPM 4V is a more available USA copy of the European Vanadis 4 Extra. These steels are the good old' hard-working steels. CPM-M4 knives are available anywhere from 60 to 64+ Rc which would obviously affect . Composition Relative Properties We already have the 4V Shaman fella's! Continue cooling to ambient temperature in the furnace or in air. Elmax and M390 are both stainless, but M390 seems a bit better in most respects -- more in the league of CPM-M4. This video addresses the subject of toughness testing with knife steel. I can get one or the other new for about $229. CPM 4V is a powder metal tool steel with an outstanding combination of properties including high impact toughness and very good wear resistance. abbazaba Member Posts: 3874 Joined: Mon Nov 09, 2015 9:40 pm Location: New England. Steels like CPM MagnaCut, CPM M4, CPM 4V, and CPM CruWear fit in this category. Perhaps just you expected CPM-M4 to be better. Stainless Steels They both offer more toughness and edge stability at a higher working hardnesses then CPM M4, yet reduced edge aggression and wear resistance. We chose ~61 Rc for our initial study because a fair number of knives are produced around the value, and gives a more 1:1 comparison in terms of wear resistance with other knife steels that are typically around that hardness. Top. Then cool slowly with the furnace at a rate not exceeding 50F per hour (28C per hour) to 1000F (649C). Both steels offer excellent toughness at different levels of hardness and are therefore highly resistant to breaking or chipping. CPM 4V is unique in its potential to be very, very strong, much more then it's more malleable and tougher cousin, 3V. . According to It chemical composition and hardness, the CPM M4 offers the following properties: Edge Retention: with a hardness of 65HRC, the CPM M4 offers an exceptionally Edge retention, one of the best in tool steels even in carbon steels. From a custom knife maker perspective, there is no reason to use CPM M4. Thus these are popular steels in heavy-duty survival/bushcrafter type knives, from major name production and custom knife makers. CPM M4 is heat treated to a relatively wide range of hardness, all the way from 60 Rc up to 64+ Rc. CPM 10V offers higher toughness and is more suitable for knives that their applications require additional wear resistance. I do believe CPM M4 has a slightly higher overall carbide volume, but not by much, thus making 4v "tougher", in theory. From a custom knife maker perspective, there is no reason to use CPM M4. The best steels with balanced properties include 4V/Vanadis4E, CPM-CruWear, and CPM-M4. Statistics 07 10 06 05 Rankings Edge Retention Toughness Corrosion Resistance Ease of Sharpening 2 - Bradford Guardian 3's (Wharnie Vanadis 4E and 3V/Drop Point) 1 - Monterey Bay Knives Slayback Flipper - ZDP 189. However, MagnaCut provides better corrosion . The way the blade curves to the point mimics the arc made by the motion of your arm, which helps the Essential perform like a much larger knife. As Crucible states it has high impact toughness and wear resistance and should be considered for the applications whre higher attainable hardness and wear resistance are desired compared to Crucible CPM 3V steel. With this hardness level, knives made from this steel portray high wear resistance, excellent edge retention, and, most importantly, without compromising toughness. In terms of comparisons with other steels, MagnaCut looks very similar to CPM-4V and Vanadis 4 Extra as was expected (labeled V4E with a tan line on the non-stainless chart). In terms of comparisons with other steels, MagnaCut looks very similar to CPM-4V and Vanadis 4 Extra as was expected (labeled V4E with a tan line on the non-stainless chart). CPM-M4 knives are available anywhere from 60 to 64+ Rc which would obviously affect . Conclusion The CPM M4 offers great qualities for a knife, in exception of corrosion resistance, it has great edge retention, hardness, and wear resistance. Perhaps just you expected CPM-M4 to be better. Vanadis 4 Extra is slightly different than CPM-4V which may be a borderline case but I didn't have any Vanadis 4 Extra so that made that decision easier. My favorites of the high edge retention group are Vanadis 8 and CPM-10V. Reactions: rodriguez7 and kuraki. Not that M390 is a slouch, I've got plenty of knives with M390 and I'm always on the lookout for 4V and 10V blades. About CPM MagnaCut Steel Designed by Dr. Larrin Thomas, boasting the edge retention of CPM 20CV with the toughness of CPM 4V. Disadvantages: Relatively more difficult to sharpen than CPM 3V and predecessor tool steels like A2, not as tough as CPM 3V or CPM 4V. CPM, made tough, and made in the USA! The S30V looks about right based on others' tests. CPM 4V should be considered for service in fine blanking, powder compaction tools, for processing high-strength low-alloy (HSLA) steels, advanced high-strength steels (AHSS) and applications where a combination of . CPM 4V vs CPM 10V. High Edge Retention, Moderate Toughness. This video addresses the subject of toughness testing with knife steel. CPM 4V is a powder metal tool steel with an outstanding combination of properties including high impact toughness and very good wear resistance. The steels used are CPM 4V, CPM M4 . The cold work tool steels known for superior wear resistance typically contain significant amounts of vanadium with sufficient carbon to form high volumes of vanadium carbides. Each steel is evaluated in terms of four performance characteristics: edge retention, toughness, corrosion resistance, and ease of sharpening. This of course depends on heat treat as either can be heat treated a little softer to improve it's toughness. CPM 4V will have all the vanadium carbides but will be tougher and operate with a . much more then it's more malleable and tougher cousin, 3V. They both offer more toughness and edge stability at a higher working hardnesses then CPM M4, yet reduced edge aggression and wear resistance. Made in the USA by Crucible Industries. What it is: CPM M4 is a "Crucible Particle Metallurgy" carbon tool steel, widely regarded as a "super steel" for its properties and performance. CPM MagnaCut vs CPM 4V. The steels used are CPM 4V, CPM M4, and CPM S90V. The steels used are CPM 4V, CPM M4 . Since it's a tool steel, it is prone to patina and rust way more than M390. CPM-M4 M390 CPM 20CV Lc200N CPM-S45VN. The steels used are CPM 4V, CPM M4, and CPM S90V. Carbon and tool steels (chromium content less than 13%) Crucible: CPM-M4, CPM-3V, CPM-4V Generic: A2, O1, D2, 1095. CPM 4V and 10V are all made by crucible following the same production process, the only difference is the composition of the alloys.