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Anybody thought about stripping a steel frame, and give it a color case hardening treatment, like shotguns's steel parts ? If there's something that's enduring the test of time over tough outside conditions with steel, it's that one...?
I thought it might look really nice ? I'm planning on building a commuter/beater out of an old Peugeot (and maybe using that finish)...
I even think I saw something that looked similar on the gallery section, where the braze-ons were left "natural" on a road steel frame.
NOTE: I would only like to obtain the finish, and not go in the whole process about hardening the steel. Maybe I can obtain it by heating the tubes with a blowtorch, and either give it a "gun blue" finish, or even a matte clear.
....I weighed the frame : 2484 g...................
Though it would be cool to investigate if such a finish is do-able, I think I'll go a more simple route...
....I'm afraid to weigh the fork now....
I got a quick reply from Simonne who's been there for ever ( wife of Giuseppe Marinoni, and owner), giving the best customer service. I'll try to give an appropriate translation since the original message is in french:
" Does your Peugoet have brazed-on welds, or TIG weelds like the Speedvagen ?
We did that finish on our Strada model 5 or 6 years ago. With a blow torch on the brazed-on welds, and with the TIG on our TIG welds. But I can't tell you if you can do it without danger, because I don't know what kind of welds they were using. You still have to finish the frame with transparent primer, and clearcoat. It's more complicated than paint, and, to us, less resistant. I saw the color case hardening method on firearms at HOW IT'S MADE, and they don't have to paint them because they put them over heat treatment. You couldn't leave your frame without protection, it would rust immediately.
P.S. Our winters are way too long for cyclists."
I think it looked like this:
http://www.woodcockcycle.com/photo_gall ... &photo=128"
Speaking of Marinoni:
I liked the looks that I obtained actually. There's some primer residue that I can't completely take off, and a few rust stains remaining, but I think it looks cool this way.
I also passed the blowtorch over the welds to see what it would look like.
Here's the results.
I'll just give it a matte clear, and build it like it is now.
For those interested, the frame lost 50g after the stripping. It now weighs 2440g .
in some powder and then after bringing it to a cherry red quenching it into water or oil, depending on the alloy. The quenching will make the steel tubes quite brittle and loose
cro-mo's elongation qualities or fatigue life. Case hardening in pure metalurical sense
is usually done for wear resistance such as pins and bearing races.
The blow torch treatment and cooling will also weaken your frame by burning out more
carbon. In effect an annealing action.
For gun parts this is acceptable (case hardening), for bikes no.
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