Re: Boring bars - was 'Reaming cast iron question'

On Tue, 22 Nov 2005 11:11:54 -0000, "Dave Baker"
<Pumaracing(NoEmails)@aol.com> wrote:

>All grades of steel have about the same Young's Modulus. Composition and
>heat treatment will affect the tensile strength and hardness but the Young's
>Modulus stays resolutely the same. Mild steel is therefore as good a
>material for the shank of a boring bar as the best high alloy heat treated
>steel. I know, it bugs me too and doesn't seem totally logical but it
>appears to be the case.

Yep - you are right. Composition of the alloy has only a very minor
effect on the Youngs modulus, and the state of hardness none at all.

The state of hardness/temper affects only the point at which you reach
elastic limit & what happens when you do - deformation vs the material
fracturing.

Regards,
Tony
.

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