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Old 02-19-14, 05:12 PM   #1
xtc14
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Niobium Steel Alloy

I came up today with a bike shop and frame builder here at Guadalajara, MX
At their facebook page they uploaded a picture of a Columbus Niobium Steel Alloy tube:
https://www.facebook.com/15567690796...type=3&theater

So where does the Niobium tubing stand compared to Reynolds 953 or even a Titanium tubes?

The guy can build you up a nice S3 frame material (I'm not sure what S3 stands for) for around 28,000MXP (1 USD ~ 13.5 MXP) frame and fork only.
I might go to his shop to talk about the tubing, etc of those builds.

I piqued my interest since I'm waiting to pull the trigger on a Motobecane LeChampion SL Titanium.

Any thoughts on those Niubium alloy tubes?
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Old 02-19-14, 05:45 PM   #2
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google offers http://www.columbustubi.com/eng/3_3.htm

Mechanical characteristics:
Ultimate tensile strength = 1050 1250 MPa
Yeld strength: min 750 MPa
Minimum elongation: 14%

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So where does the Niobium tubing stand compared to Reynolds 953 or even a Titanium tubes?
now look up the material characteristics for those metals ..
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Old 02-19-14, 07:58 PM   #3
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Might be looking at the wrong end of the equation.

The idea behind the use of stronger steel alloys isn't to build a stronger frame, it's to build a lighter weight frame that's equally strong. The challenge of working with thinly drawn tubes is to 1. avoid "beer can" crushing failures and 2. not to burn through the tubes during the joining process. One way of avoiding the latter is to fillet braze the joints. Of course, when you do that, you're adding a lot of heavy brass to the frame.
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Old 02-20-14, 08:49 AM   #4
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retro

Good heavens no. The sin of all that heavy brass. Just think of it. If a person were to ride clear across country with a frame that was brazed with that dastardly brass, he might be 40 feet behind a bike without that brass.
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Old 02-20-14, 08:52 AM   #5
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But slightly off subject here, can anyone deny the beauty of the hand brazed frames of the 80s and earlier.
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Old 02-20-14, 07:43 PM   #6
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It's heavier than iron and weaker than aluminum. Tell me why anybody would want to use it???

6061 T6 = 35,000 PSI
7075 T6 = 74,000 PSI
4130 normalized = 97,200 PSI
Niobium = 18,000 PSI
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Old 02-21-14, 09:31 AM   #7
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Originally Posted by BlazingPedals View Post
It's heavier than iron and weaker than aluminum. Tell me why anybody would want to use it???
It's not pure niobium, but niobium alloyed with iron, carbon and other elements. The properties of an alloy are not linear combinations of the properties of its constituents.
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Old 02-21-14, 09:22 PM   #8
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Quote:
Originally Posted by BlazingPedals View Post
It's heavier than iron and weaker than aluminum. Tell me why anybody would want to use it???

6061 T6 = 35,000 PSI
7075 T6 = 74,000 PSI
4130 normalized = 97,200 PSI
Niobium = 18,000 PSI
There's more to making a bicycle frame tube than just strength. The niobium is probably there for some other property such as the ability to be drawn into thinner walled tubes.
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Old 02-24-14, 03:35 PM   #9
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Columbus Nb/Fe alloy
Ultimate tensile strength = 1050 1250 MPa
Yeld strength: min 750 MPa
Minimum elongation: 14%

Reynolds 953
Ultimate tensile strength –1750 to 2050MP
Yield strength 1500-1900 MPa
Stiffness Modulus (E) is 200 GPa,

So no, it's not a comparible.
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Old 02-24-14, 07:08 PM   #10
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I missed the 'alloy' part.
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Old 02-26-14, 12:37 AM   #11
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Quote:
Originally Posted by fietsbob View Post
google offers http://www.columbustubi.com/eng/3_3.htm

Mechanical characteristics:
Ultimate tensile strength = 1050 1250 MPa
Yeld strength: min 750 MPa
Minimum elongation: 14%



now look up the material characteristics for those metals ..
You must work in Microsoft support
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