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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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