Titanium armor, can it be used for knife?

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Feb 21, 2001
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Ok guys, I have a friend who builds things out of Armor for DOD. And recently the Govt specd Titanium armor. He used ATI425 titanium armor and has quite a few drops he said I can have if I can find a market for it. Well I at first decided to see if I could cut it with my bandsaw, Yes it cuts easily albeit slowly. Next I attempted to drill a hole in it with a hss bit, THat was a big no-go. Lastly I attempted to machine it with carbide mill bits, no problem. I next tried to hit it with a file, the file almost skated on it, almost like half hard steel. Lastly I took it to the sanding machine and using a worn blaze belt attempted to grind it. Well when the Ti got orange hot so I quenched it in water and it got hard as glass. I could no longer sand it and a file skated like hardened steel. I was only planning to make bottle openers or whatnots out of it to sell but now I wonder if I dont have a Ti-alloy that might make a good knife.
Here is what I would like, a few very very experienced volunteers who could attempt to make a knife out of this stuff to see if it has potential in the knife world before I decide what to do with this stuff. I prefer fulltime makers who can tell me if its worth a darn in a knife or not. A rockwell hardness tester would be good as well so we can see what we are getting on the rockwell test. I am still unsure how to harden this stuff and can not find anything on the net, but its definitely harder where I got it hot and quenced than everywhere else on the billet.
PS This is 1/4 thick stock.
Who is up for the challenge. I only have enough here to send out 2-3 billets at this time but can get much more if this looks promising.
 
can not find anything on the net,.



data sheet.

http://www.alleghenytechnologies.com/defense/docs/ATI_Def_425_MIL_1.pdf

http://www.alleghenytechnologies.com/ati425/specifications/datasheet.asp

It looks like it is made to have similar properties to 6al4v, but accept cold rolling and fabrication more easily which should bring costs down.

- meaning that it is less springy and no good for frame lock folders.?

"The combination of strength and ductility found in ATI 425®-MIL Alloy make it useful for applications that require bending and forming. With ATI 425®-MIL Alloy, parts can be easily manufactured while maintaining superior strength compared to parts made with similarly formable low-alloy grades of titanium"
.


Harden-ability ? I don't see any info on that, but you could still go after the EOD / non magnetic / diving market.
 
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