Monday, November 16, 2009

Re: Normalized Steel

On Nov 16, 2009, at 8:30 PM, Alfonso Quilala wrote:

> Does the steel which will undergo heat treatment (normalizing) to
> improve its mechanical properties will change its chemical
> properties also?
No. normalizing is usually done to improve toughness. It's a grain
refinement process involving heating to just under the critical
temperature followed by a controlled cool.
> We have a vendor that have surplus of ASTM A572 steel but need to
> normalized the steel in order to pass charpy test. Is it still
> required to submit another CMTR of the steel after the heat
> treatment? Or the original CMTR is sufficient?
Heat treatment changes the microstructure enough to change the
mechanical properties, so you'll need new test reports. Certificates
of compliance won't do it because you're apparently doing non-
standard processing. And you'll want Charpy test results anyway.

I went through an old copy of ASTM A-572 and couldn't find any
specified values for Charpy test. You might want to think about how
you'll know what Charpy value you need to pass the test and what the
testing temperature should be.


Christopher Wright P.E. |"They couldn't hit an elephant at | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania

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