OK! Here are the numbers: Approx. at room temperature.
C.P. Grade #1
Ultimate Tensile Strength (000 psi)-35
Yield strength(000 psi) 0.2% Offset-25
Elongation in 2"(%) Sheet>0.025 Thick-24
Hardness-Rb = 70
C.P. Grade #2
Ultimate Tensile Strength (000 psi)-50
Yield strength(000 psi) 0.2% Offset-40
Elongation in 2"(%) Sheet>0.025 Thick-20
Hardness- Rb = 80
C.P. Grade #4
Ultimate Tensile Strength (000 psi)-80
Yield strength(000 psi) 0.2% Offset-70
Elongation in 2"(%) Sheet>0.025 Thick-15
Hardness- Rb = 100
Alloy Grade #5 (6% Vanadium/ 4% Aluminum)
Ultimate Tensile Strength (000 psi)-130
Yield strength(000 psi) 0.2% Offset-120
Elongation in 2"(%) Sheet>0.025 Thick-10
Hardness-Rc = 36
Grades 1 & 2 can be certified for surgical implant chemistry. Tube
and pipe is usually grade 2. The difference in the two is few parts
per million of oxygen, hydrogen, iron and other trace elements.
Aircraft and high strength applications are generally Grade 5, also
referred to as “6/4”. There is a “3/2.5” which is very similar to
6/4 but easier to work. Your spokes are 6/4 most likely. There is
6/4ELI specifically made for surgical implants. ELI = extra low
interstitial.Which, as I understand, it relates to the compactness
of the crystal structure.
There is “3/8/6/4/4” AMS spec 4957 which I believe the very springy
alloy used in many glass frame. I know little to nothing about it.
Just that you won’t find in laying around.
It is possible to find “end of runs” and over runs. This usually
requires a lot of calling around and asking people to go look in the
back room. It is time consuming for everybody involved. There just
is no value in doing the work for little or no pay. Many mills
don’t make a dime until the order reaches $200 to $250. It is not
worth it to even ask if they have a few feet of this or that. If
there is a bit sitting around its liable to be 5 - 10 pounds. You
want it to work with, you have to buy the lot. It is the nature of
the beast. I have 22 years of doing this, it can take days. It is
usually a waste of time. Most of the product in this industry is
made to order. If there is a little over the purchaser usually takes
it too. Bill
Reactive Metals Studio, Inc.
PO Box 890 * 600 First North St. * Clarkdale, AZ 86324
Ph-928/634-3434 * Ph-800/876-3434 * Fax-928/634-6734