[TheForge] Hardening steel

Sat Sep 7 02:38:01 2002

If I am understanding this, an annealed carbon rod will bend a given amount with
out becoming permanently bent (it will return to straight when the pressure is
released). The same rod hardened will bend the same amount with an equal
pressure. The difference comes in when you apply pressure greater than the
annealed rod will stand and it remains bent. In this case, the hardened rod will
resist this force and further require even more force to cause the hardened rod
to remained bent.

Darrell

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----- Original Message -----
From: "Peter Fels and Phoebe Palmer" <[email protected]>
To: <[email protected]>
Sent: Friday, September 06, 2002 10:17 PM
Subject: Re: [TheForge] Hardening steel

> At 08:40 PM 9/6/02, you wrote:
>
> My old cooked brain is having a lot of trouble with this one...not a good
> week in that regard. First i get outsmarted by a large piece of 1" plate ,
> now this...It's the problem with being self-taught by a fool.
> OK....when you take a rod of carbon steel and you flex it, the outside of
> the curve has to stretch and the inside compresses. If you harden the rod,
> then it becomes more resistant to stretching and compressing. Therefore it
> should become stiffer....NO?..apparently not . I don't get it.
> Would someone be merciful and explain this  to us igorantses...Pete F
>
>
> >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
> >
> >
> >
> >
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