Thread: handlebar
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Old January 14th 18, 11:06 PM posted to rec.bicycles.tech
Jeff Liebermann
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Default handlebar

On Sun, 14 Jan 2018 14:32:16 -0500, Frank Krygowski
wrote:

On 1/14/2018 2:01 PM, Jeff Liebermann wrote:
On Wed, 10 Jan 2018 02:38:48 +0100, Emanuel Berg
wrote:

Take one piece of aluminium and one piece
of stainless steel and hold it in ur hand -
they must be the same size, you can feel
the weight different: aluminium is much
lighter, while stainless is much heavier.


It depends on the type of stainless steel. Exotic alloys, complex
heat treatment, and a lengthy annealing process, will produce a
stainless steel that is quite strong and suitable for bicycle frames
(and by implication, handlebars):
http://www.kvastainless.com/tubing-info.html
http://www.kvastainless.com/bicycles/
http://www.kvastainless.com/technical-library.html


That's a precipitation hardening stainless steel. That's _very_ exotic
stuff.


It may be a pain in the posterior to heat treat, with the steel at
480C-800C for 4 hours waiting for a precipitate to form, but methinks
it's becoming more common, available, and possibly affordable:
http://www.outokumpu.com/SiteCollectionDocuments/Outokumpu-martensitic-grade-630-data-sheet.pdf
17-4 PH stainless (also known as UNS S17400 or SAE T-630) seems to be
available in various flavors:
http://www.matweb.com/search/quicktext.aspx?SearchText=UNS+S17400%20stainless
http://www.matweb.com/search/QuickText.aspx?SearchText=17-4%20stainless
for a multitude of mundane applications:
https://www.tubehollows.com/alloys/stainless-steels/17-4
"...alloy 17-4 PH is a superb choice for structural components
of airplanes, biomedical hand tools, food processing equipment,
pulp and paper mill processing and nuclear waste processing
and storage."
The tubing is supplied as "solution treated" at moderate hardness,
which can be machined and possibly hydroformed into components. Once
that's done, a simple low temperature heat treatment (age hardening)
brings it up to full strength.

There's also 17-7 PH which seems to more appropriate for tubing:
https://www.tubehollows.com/alloys/stainless-steels/17-7

No clue on the cost of such a 17-4 PH frame or handlebar:
http://www.kvastainless.com/inox-bicycles.html

Mo
"The Surge of Stainless Steel"
https://roadbikeaction.com/features/rba-features/the-surge-of-stainless-steel
http://www.bobbrowncycles.com/stainless_frames.htm
https://www.google.com/search?q=stainless+steel+bicycle+frame&tbm=isch

Drivel: How about a frame from conglomerated materials? In the frame
triangle, use one tube each of aluminum, stainless steel, and carbon
fiber. The other tubes can be a mix of plastic, ordinary steel, wood,
bamboo, and titanium, using whatever material is best suited for the
particular structural member. Soon everyone will be riding around on
non-homogenous frames.

--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
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