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Old January 14th 18, 11:42 PM posted to rec.bicycles.tech
Frank Krygowski[_4_]
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Default handlebar

On 1/14/2018 5:06 PM, Jeff Liebermann wrote:
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


From the dreamy adspeak: Stainless steel's ride can be "crisper" and
"snappier."

Is that better than "rigid, yet compliant"?

--
- Frank Krygowski
 




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