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Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

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Old 07-17-08, 06:02 PM   #1
tyler_online
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high-carbon steel?

Hi there,

I have an old road frame, not sure what the year is. But its somewhere within the 70's and 80's range. It's been tricky to find the year, because the frame when I got it only said Nishiki on it... no model type.

Anywho, on the top tube, it says hi-carbon steel frame. I am wondering what that means. Is this a lower grade or higher grade steel? Good? Bad?

Any insight would be great.

thanks
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Old 07-17-08, 06:03 PM   #2
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it also said 170 beside the hi-carbon if that helps
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Old 07-18-08, 01:23 PM   #3
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It is probably just advertising words, unless there is enough carbon in the steel that the whole thing was post build heat treated. That would be a big deal to pull off, does the bike look worth that?

Other than that one has stuff like 4140 that is stronger than 4130, but not usually available in tubbing. The 40 or 30 are the points of carbon, and add to strength but do not require heat treating. 4130 is used in aircraft tubbing, and lots of bikes, 4140 is used in gun barrels, and shafts where greater loads are expected. So there is an example of more carbon also being better. Nothing to worry about.
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Old 07-21-08, 11:03 AM   #4
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Great,

I doubt that it is post build heat treated, seems like a pretty standard lugged steel frame. Seems to be similar to a lot of peugot's of the past. Rides really smooth so I'm happy and satisfied.

Thanks for all the info, greatly appreciated.
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Old 07-21-08, 12:38 PM   #5
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If it is lugged then heat treating would be very complicated...
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