Bark River Magnacut Rust?
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- Опубликовано: 12 сен 2024
- Bark River Magnacut Rust? I test out a theory thar some of the issues people report of their Bark River Magnacut blades taking a strong patina is related to grinding dust impregnated into the steel
The acidic nature of vinegar will etch stainless and carbon steels especially if the vinegar has been heated to 115 degrees F. This is what appears to be happening in your video. The longer it remains on the metal the deeper the etch will become. I sometimes do this in my knife making process for different appearances. I believe the darkened polish is caused by metal removal by the fine grit that is in the polish. Very good content and informative.
I have 3 Magnacut blades. Two Bark River’s and one custom. I’ve been testing multiple steels as food prep knives for about a year. An example, I would slice up an apple and cheese with 5 knives and let them sit overnight. My Magnacut blades are all reacting differently and are all harder to keep up with than most of the knives tested. I haven’t oiled or polished the blades just wash them every day. Of my Bark River’s Magnacut, 3V, S35vn, S45vn, Cruwear, my Magnacut looks the worst. One has multiple spots that rust (developing pits) and the other has a badly cloudy finish like hard water stains, and I once used a Sharpie marker on it and the marks are impregnated into the surface.
That’s definitely not supposed to be how this steel behaves. I know that others are experiencing similar results in terms of corrosion resistance. I have to wonder if it has to do with the heat treat protocol. A high temperature temper will reduce the corrosion resistance of the steel. I believe they can temper up around 850-900 degrees or temper at a low temperature of 350-400. High temperature tempering offers a lot of advantages for manufacturing and grinding. It’s more forgiving when keeping the blades cool when grinding.
The steel I’ve been impressed with is Cruwear. I would also note that my Custom Magnacut has far better edge retention than anything I’ve tested, while the other two perform in the middle of the pack like my S45vn.
@@dlrmon1 yup, Cruwear has been a standout for me as well. 4V also
I’ll have to try 4V...Of the knives I’m testing, the ones that still look the best, in order; Enzo Elmax, Hinderer 20Cv and Benchmade S30v & M390 all still look new (the later 3 are stonewashed), then BR’s S45vn still looks relatively new. The rest have all formed a light patina.
I’m glad that all cleaned up for you. I love my Barkies.
It’s a great little knife. Me as well!
Theoretically, I think Magnacut can be a great steel. My thought is that manufacturers are still struggling with it’s production and falling short of what’s required...
The black-colored residue on your polishing towel is probably mostly, if not virtually all, blade metal. Polishing compounds are an abrasive which removes metal from the substrate in addition to any stained (oxidized) metal. If you don't believe it, polish a blade which is known to be absolutely clean and unoxidized with your compound. Guaranteed, it will remove a small amount of metal, resulting in a black-colored polishing cloth.
I've got two Bark River Bravo 1 Lt knives that got a patina immediately upon use. I polished one with flitz to get any grinding dust off and it has developed patina again.
That’s interesting. I’ve experienced a little bit of patina after polishing as well. It’s certainly less than what I see in my 4V blades but more than expected. My thoughts are that Bark River are using a high temperature tempering protocol which would reduce the corrosion resistance of this steel. All other performance categories should be unchanged. At least not in any way that the end user would notice. The high heat tempering process would be very beneficial for the grinding process Bark River uses. It’s much less likely to overheat the blade while grinding. That’s my theory anyways!
Use flitz ceramic sealer. I use the flitz polish first, then flitz gun and k ife wax and then the ceramic sealer and it stopped it from coming back
Good info
There are voices saying this batch of MC was decarburized during the stress relieve phase.
I had rust on my magnacut drop point hunter after wet forming a sheath. Did the same with 3v and had no rust. The rust came off easily enough just with some stropping, but I'm still disappointed in the lack of corrosion resistance that one should expect with magnacut.
Good findings!
We both called this one! I’m glad our hypothesis proved to be true. The steel is very impressive in terms of overall performance.
Mike Stewart said there was contamination at the factory that produced that particular magnacut.
I think he was talking about an inclusion in the steel which happens from time to time in any steel.
Where you get that? Give me the link for video where Mike is saing that please.
why?
@@PhillipMoitawhat why? Wanna see what he realy said.
@@zdenekbart And I don't give a shit what you want! You think you're talking to your son?
There are two options.
First is grinding dust from other steels, which is not big problem.
Second they mislabled steel, and in real is not Magna-Cut. They did it in the past many times. Cedric and Ada have video they mislabled knife which should be CPM-154 but in real it was A2.
Bingo
Oh come on…
They probably mislabeled the steel
Great video
Thank you!
Μagnacut super steel my ass😂😂😂😂😂😂😂
Poor heat treatment.
Possibly. I’m leaning towards it being that they used a high temperature tempering cycle which would have reduced corrosion resistance. Also, they ran it softer than the target HRC of 63 which may be a factor
Sounds like you don't have magnacut
It certainly makes me wonder. I’ve done some XRF analysis on the Magnacut blades I have and they all tested the same but the lab only had the soil module for the tester so it didn’t give me any information other than that they tested consistently with each other. I think that they have done a high heat tempering process on these knives which will reduce the corrosion resistance. The edge holding and toughness is indistinguishable from my 4V knives and certainly more stain resistant