HPALLOYS

Joined
Apr 10, 2001
Messages
45
Against better advice I did buy the skinny bent crooked pieces of Cobalt 6bh from Hp Alloys. I realy should have listened to the advice I didn't realize I needed.

It was cheap cause that is all it was worth. I did manage to grind out a couple of pairing knives to see how this Talonite copy (??) would grind. It grinds pretty easy. Good enough so that the next project is a full size knife with a full size piece of real TALONITE. I gave both knives away for use and hopefully abuse.

One of the "knife blanks" was curved so much as to be unusuable. I haven't decided as of yet what to do as of yet with that, but it is doubtfull that I can use it. I should send it back, but have not email to inquire as to the procedure.

I did have a long email conversation with HPALLOYS, before the arrival of the "blanks". The jist of it is that they are very sensitive to critisism of any sort, and have quite an interesting approach to buisness. I did state that I thought calling this size piece of metal a "Knife Blank" was stretching a point and the response was (paraphrased) 'what should we call them? scrap pieces of a very expensive alloy" Yes, because that is what it is. I would also add expensive scrap that you are trying to turn into extra cash. (Ain't America Great!) They did send a analysis sheet with Mitsubishi's name on it. I had hoped for better. Has any one else had any current experince with them?

Grinding this alloy was pretty much a breeze. Getting an edge that feels real sharp is an area I have not yet mastered. It sure does seem to cut and cut. I should mention that I grind on a cone-loc, and it still grinds pretty easily.

All in all a worthwhile experience, and two friends have little cobalt 6bh pairing knives to use.
 
I believe I made a mistake in buying two of these cut-off turbine blades (?) That is what they appear to be, tapered from one end to the other and beveled on only one side. Don't know if they are used, were never used, defective, or whatever, but in checking them out I found that they bend quite easily . . . and Stay bent. DISAPPOINTMENT (and Other Words). Not quite what I had in mind for a flexible fillet knife. Like most metals they are less easily straightened, but not too bad on a one-time or at least once-in-a-while basis, but not every time after a few fish.

Anybody know how to stiffen them up? The HP Alloys website does not contain any clues I can find, just chemical composition and wear resistance of a sort.

Think I will try cold forging one with an old hammer and an anvil that needs resurfacing. Can't make it much easier to bend I don't think.

Best,

harvey Heffernan

Caveat Emptor!
 
Stellite and Talonite are cobalt chromium alloys.

The prime characteristic of cobalt/chromium alloys is their wear resistance not their hardness or stiffness. They can be bent and straightened without weakening them, some people even cold forge them. They do not need to be heat treated, the metal is as hard as it will ever be as it comes from the supplier.

Because of the wear resistance they hold an edge better than other materials in straight cutting tests.
 
In a word, don't. They chip (not like hard steel, just sort of "flake"), crack, and just do not 'beat out' like a soft matrix; they crumble like a good cookie.

I do not know if it is because these 'cheapies' are from used turbines or just the nature of the HP alloy. It is obvious from the 'cheap chunks,' that they are ground (rather roughly) at least partly to shape, with a heavy black (oxide? whatever) "finish."

I have an inquiry to HP in now on the metal.

Best,

harvey Heffernan
 
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