titaium

DCK8 · Jan 4, 2000

can anyone tell me the difference in commercaily pure and 6/4 titaium

Dr.Lathe · Jan 4, 2000

I would call Rob Halpern at Halpern Titanim. He sells both. I'm not home now or I would put up his adress. He advertises in the knife mags.
Here is my understanding which could be totally wrong

Commercialy pure is softer and I think is preferred for jewelry making. 6AL4V is harder and is good for knife frames and such.
I will watch this thread to see if anyone corrects me!
Neil

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JoHnYKwSt · Jan 5, 2000

Dr Lathe is correct. Commercially pure titanium is exactly what it sounds like, pure titanium. 6/4 titanium is titanium that has 6 percent aluminum and 4 percent vanadium added for strength, hardness etc.

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Johnny
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Michael Vagnino · Jan 5, 2000

Les Halpern (Halpern Titanium) phone #
1-888-283-8624 One of the best suppliers
of titanium around.

BARRY JONES · Jan 5, 2000

http://www.halperntitanium.com

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Chiro75 · Jan 6, 2000

CP (commercially Pure) titanium is, as was stated, titanium in its purest unallyoyed form. Sources are variable, most being from the USA, Russia, or China, but also from Europe. CP titanium has excellent corrosion resistance, but its strength-to-weight ratio is rather poor, especially compared with 3/2.5 Ti and even some modest steels. Unless you're building bike frames or other structural elements, however, this really isn't much of an issue. There are four grades of CP Ti that originate in the USA, with the different grades being designated by oxygen content. Other countries grade their titanium differently, but with some poking around you can usually figure out what is what even with different "names" from the various grading systems. CP's yield strength varies from 25-65 ksi (thousand pounds per square inch), and the grading system worls with Grade 4 having the highest yield strength and Grade 1 having the lowest. Again, probably only an issue in load-bearing structural projects.

6Al/4V titanium is 90% titanium, 6% aluminum, and 4% vanadium. It is the brainchild of the aerospace industry, with an excellent strength-to-weight ratio and it accounts for about 50% of the overall titanium usage in the USA. It tends to be less ductile, but again, if you aren't making tubes you'll not notice this. 6/4's shear modulus value is less than 3/2.5 titanium, which can be a probelm with repeated torsion (probably not an issue with knives). It is more expensive and harder on tools, so it is costly and difficult to get it to do what you want.

An alternative is 3Al/2.5V titanium, which is sort of a magical compromise between the CP and 6/4 alloy. Probably the bottom line, though, is for use in knife manufacturing, they're all pretty much the same. Any arguments?

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Burke · Jan 5, 2000

Hey, so the 6AL must refer to the percentage of ALuminum, and the 4V is the amount of Vanadium...pretty cool. You learn somethin' new every day.

Nomad · Jan 7, 2000

I have been interested in using Ti for folder
handles - basically like scales without liners - but I have been turned off by the expense of the required Cobalt tools to machine it. Does Commercially Pure (CP) Ti machine easier than 6Al4V?

Which Ti (CP or alloy) would you recommend for this application? How would you compare these two Ti options for machining, grinding, shaping, and wear resistance?

magnum .44 · Jan 7, 2000

cobalt tools aren't extremely expensive. t's worse when your doing exotic hardwood work, i have to buy carbide cutters, very expensive. titanium doesn't sound extremely hard to work, but i heard the sparks can light metal dust on fire. it does chatter when your cutting it though. what type of machines are you using to work this stuff?

Nomad · Jan 8, 2000

I have an old Unimat but I haven't gotten to the point of purchasing materials yet. I'm still researching this and finding that most people who seem knowledgeable on the subject have expressed that it is difficult to machine Ti but I have not heard them mention a distinction between CP and alloy.

Many people seem interested in using Ti for a blade where hardness is required. From what I'm hearing in this forum it seems to me that they are probably working with an alloy whereas what I need for a handle would be different properties alltogether. I am hoping that CP might give me the amount of strength that I need as well as being easier to work into the shapes I want.