[TheForge] Hardening steel

[Bob Ehrenberger]

Mike,

I tried to find this information in the metals handbook but the only thing I
found on Modulus of Elasticity was in relation to different temperatures.
I'm not trained in this but got the books from a friend when he got the new
edition. The index said that it would be K1 on the charts but I didn't see
that on any of them.

We are off to a sale this weekend but I'll try to run some tests next week.

Bob Ehrenberger
Shelbyville, Mo

> I will have to test this myself

Hi Bob,
  It is one of those things that don't seem to make sense at first look, but
is the case.  If you look at a data sheet on most any grade of steel, you
will see the Modulus is shown as a single number, not like tensile and yield
strengths, which show the properties with differing tempering temperatures.
I agree it still seems like it shouldn't be that way, but if you want to
change the amount of bend or deflection under a given load, you need to
change the cross section of the material, or change to a different material.
The average modulus for steel is 29,000,000 which you get by dividing the
stress (pounds per square inch) by the strain (inches per inch).
Aluminum for example is only 10,000,000 (same as glass), Titanium
17,000,000,
etc.
Good luck with your testing,
Mike Schermerhorn