That being said, proper stones and technique make any steel "easy to sharpen", some just take a little more time You can compare with many other steels in this article which contains all of my micrographs."įor what it's worth I too find it much easier to sharpen than the steels with more vanadium and tungsten carbides. Stainless steels with a lower carbide content like S35VN, S45VN, or Vanax also have a finer microstructure. The high volume of chromium carbide means that M390 has a larger carbide structure than those steels, however. This high carbide volume results from the high carbon and chromium in the steel, which puts its carbide content similar to steels like Maxamet, S90V, and 15V. Bohler reports that M390 has about 18% chromium carbide and 2.5% vanadium carbide, and in my metallography I found about 22% carbide. Chromium carbides tend to be larger than vanadium carbides in power metallurgy steels which limits toughness, but they are easier to sharpen because they are softer than common sharpening abrasives like aluminum oxide. You can read more about the interaction between different elements for carbide formation in this article on carbides. The vanadium does increase the hardness of the chromium carbides, however. The high chromium content in M390 means that less of the high hardness vanadium carbide is present in the steel, and the majority of carbide is the lower hardness chromium carbide. Larrin addresses the carbide type in 204p class steels and why they are easier to sharpen: I have two S110Vs (PM 2 and UKPK) and never dared to even put them close to the sharpening gear because of what I have read. I've yet to use 20CV but I found 204P easier to sharpen than S110V. CTS-204P is made by the USA-based Carpenter Technology Corporation and CPM-20CV is manufactured by Crucible Industries." With significant amounts of Chromium, Molybdenum, Vanadium, and Tungsten, these steels are 100% ready for action. "Bohler M390, CTS-204P, and CPM-20CV are all essentially the same steel and sport a near identical composition. Is 204P in your experience easier to sharpen than, for instance, CPM-S110V or CPM-20CV? I read the following in Blade HQ "BEST KNIFE STEEL COMPARISON AND CHARTS" and thought that it is another hard-to-sharp steel: Delica is just to small for me to carry a lot. Really wish Sal & Co would make an Endura in 204p. Makes sense given it doesn't have tons of Vanadium or any wolfram. Seems that well heat treated m390 analogs do very well in fine edge holding but not quite as well in working edge as some of the big guns like s90v, s110v, k390, etc. On a side note Gerald (Outpost 76 on YT) tested my 204p Mille and it did very respectable especially fine edge holding (170 to 179 ft cardboard maintaining shaving sharpness). I carry it a lot when I have corrosion concerns. It also showed excellent corrosion resistance for me.ĭitto on Vivi's experience on the 204p Mille. Very good edge holding but not as time consuming to sharpen as some other higher end stainless steels I've tried. I carried a Military in 204P for a while and its one of the better stainless steels I've tried. It’ll get a daily workout since we have most things delivered these days. Let the pursuit of perfection be our guide.Is it your first 204P knife? It's a very, very good steel. However by striving for perfection we create things that are as perfect as practically possible. Hope that's closer to being right (but it's still untested).įor all things perfection is, and will always remain, impossible to achieve in practice. Pop ax Remove retry counter from stack (can't do "add sp,2" without trashing carry) Mov ax, 0x0201 ah = BIOS function number (read sector/s), al = number of sectors to read Div cx dh = 0, dl = sector - 1, ax = remainder = "logical track number"
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