"MagnaCut Sharpening and Grinding
I don’t have any standardized tests of grindability, finishability, or sharpenability so I am reliant on anecdotal experiences. A fine microstructure means improved grindability, but MagnaCut also has a significant amount of high hardness vanadium and niboium carbides so I didn’t know where the grindability and finishability would end up. Initial reports from knifemakers are very positive, with Matt Gregory and Shawn Houston reporting that it finishes and grinds easier than S35VN or S45VN. Those steels have a relatively small amount of vanadium and niobium carbide so I assumed they would be easier to work with. The finer microstructure of MagnaCut apparently helps in that regard. Big Chris ground a CPM-4V knife side by side with a MagnaCut knife and reported that the MagnaCut was significantly easier to grind, even though the two knives were at the same hardness. Matt Gregory said, “This stuff grinds so easily with coarse belts that you think something is wrong with it.” So the somewhat finer microstructure of MagnaCut has made an improvement in grinding. Finishing is not as easy as CPM-154 according to Matt Gregory and Darrin Thomas, which is to be expected probably since CPM-154 has no vanadium carbides. With polishing, the closer the abrasive size is to the carbide size the more apparent the harder carbides are. Matt says that grinding is easier than CPM-154 until about 240 grit where the vanadium carbides start to make the MagnaCut somewhat more difficult. Chad Nell said that grinding MagnaCut is similar to CPM-154 but is more difficult to finish. However Shawn reported that MagnaCut was easier to finish than Z-Wear at similar hardness which was surprising. Z-Wear has a similar amount of carbide but a good portion of it is the softer chromium carbide. Apparently the finer carbide size of MagnaCut makes the difference between the two.
Sharpening was also reported to be relatively easy by all of the knifemakers that commented on it to me. Devin Thomas reported that it sharpened well even with Shapton Glass stones, which have the standard aluminum oxide abrasive, as opposed to CBN or diamond which is harder than vanadium carbide. He found the Shapton stone to sharpen better than diamond plates on MagnaCut, perhaps due to the finer scratch pattern. Shawn Houston also said that putting on the initial bevel and burr removal was very easy to do. Some steels can have issues with “stubborn burrs” particularly with heat treatments that lead to excess retained austenite, but that does not seem to be an issue with normal heat treatments of MagnaCut. Shawn found steel removal easier with a 62 Rc knife while 65 Rc felt a bit more glassy, as expected by the higher hardness. However, he also said the higher hardness knife was easier to deburr. The steel is capable of very high sharpness, of course, as most knife steels are. Chad Nell liked how MagnaCut sharpens better than CPM-154 and thought the edge that it took was better. Big Chris said that MagnaCut “gets incredibly scary sharp; best part is it has great feedback on the stones and is very responsive to stropping (the burr is not difficult to remove).” He even said it is easier to sharpen than CPM-4V."
https://knifesteelnerds.com/2021/03/25/cpm-magnacut/
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