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Probably one of the better, intelligent steel conversations I have EVER read. Both Gentlemen presented their side, disagreed, but were cordial and intelligent about it. Thank you to the contributors.
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What would be Crucible steel contender against BU M390? S110V?
- Thread starter MobileFireLord
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How hard was it? I've sharpened CPM S110V at 64HRC side by side with 62HRC CPM S30V, and I could tell the difference(110 was more difficult), although mostly on a fine whetstone - 10K.
Manganese: It adds toughness and wear resistance. I am surprised S90V does not contain it.[/QUOTE]
It does, CPM S90V composition. For that matter, it is unlikely to see a steel made today w/o some amount of Manganese in it, as usual 0.30-0.50 is a minimum. Often not listed in promo materials though, just C, Cr, and strong carbide formers like V, W, Mo, etc. and if something exotic is in it, like Nitrogen. Still, Mn is always there, so is Silicon and contaminants like Sulfur and Phosphorus, even though they are rarely listed. However, if you see something "extra clean" or "clean" as usual that refers to low S and P levels, in which are S and P are specified.
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Agreed. You folks are giving me a free education on a subject I'm very interested in. This is what makes Bladeforums such a great place.
It does, CPM S90V composition. For that matter, it is unlikely to see a steel made today w/o some amount of Manganese in it, as usual 0.30-0.50 is a minimum. Often not listed in promo materials though, just C, Cr, and strong carbide formers like V, W, Mo, etc. and if something exotic is in it, like Nitrogen. Still, Mn is always there, so is Silicon and contaminants like Sulfur and Phosphorus, even though they are rarely listed. However, if you see something "extra clean" or "clean" as usual that refers to low S and P levels, in which are S and P are specified.[/QUOTE]
Do carbide formers generally tend to make knives more difficult to sharpen?
I find S90V to be one of the most difficult steels for me to sharpen. High hardness ZDP-189 is another, although not as bad as S90V. I touched up a 110V knife yesterday and I am just amazed how much easier it is to upkeep than S90V.
Ankerson
Knife and Computer Geek
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A lot of it depends on what is being used to sharpen with....
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To split hairs here, carbides themselves do, not the carbide forming elements, per se. Carbide formers can do other things in the blade when they're "free" & aren't being forced into a carbide state.
For example, when you see vanadium in amounts less than 1% or so (as in AUS8A or VG10) its mostly there for grain refinement. The larger percentages of vanadium in other steels are for the purpose of forming carbides to increase wear resistance.
"Free" chromium helps resist corrosion & staining when not bound up in carbides. ZDP189 has a 20% chromium content but isn't very corrosion resistant because, with a proper heat treat, most of that chromium is bound up in carbides. AUS8A has only 14% chromium but is more corrosion resistant because more of that chromium is "free" & not bound up in carbides. There are other examples but you get the picture (& I can't remember them).