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The stiffness is eaxctly the same across the tubes (207Gpa).
The strength varies which does allow for thinner tube walls to save weight with better grades, but then the tube diameter has to be increased to get the stiffness back. My 953 track frame has 0.35mm walls in places and decently oversized tubes to make it very light and stiff but it will dent easily.
ie Wot @Cupcakes sed
leggy_blonde-
The stiffness is eaxctly the same across the tubes (207Gpa).
Yeah you're right, I had strength and stiffness the wrong way around
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Sorry your original post was a bit misleading.
Steel is an alloy. The stiffness depends on what and how much is mixed with iron.
What I think you meant is carbon steels for bike frames are v close in properties.
PhilDAS
Ordinata
Is stiffness not the more relevant figure for bicycle frames? The higher end tubes can be drawn thinner and maintain the same stiffness and therefore are lighter at the cost of being more prone to dents etc
Tubes in a frame are pulled, compressed, twisted, all of which stiffness = better