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Yeah the different steels are basically the same stiffness as a bulk material, but posh steel has higher yield strength and higher hardness, which means it can be formed into bigger diameter, thinner walled sections, which are stiffer than smaller diameter sections of the same wall thickness, while mitigating the risks of tube buckling and denting.
I think the chat about bulk material properties for steel Vs aluminium alloy Vs titanium Vs carbon etc is not very informative.
Cupcakes
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