Friday, October 22, 2010

[MW:7714] Re: Chemical properties of SA 213 Gr. 304H

Dear Shinde,

I don't agree with Mr. Kesavamoorthi his answer. There is a difference
between chemical composition and chemical properties. Chemical
composition won't change but chemical properties at the other hand
will, and that is what you are asking for in my opinion.
Because of materials production process and/or welding activities
Chromium carbides can / will be present in the material at the grain
boundaries, especially in case of H quality (higher Carbon content).
The formation of Chromium carbides will cause a lower Chromium content
near the boundaries of the grains, even less than 12% which makes
these parts of the structure no longer Corrosion Resistant. This can
cause Inter-crystalline corrosion. Due to the solution heat treatment
these carbides will be solved and Chromium will be devided over the
microstructure again. Therefore the chemical properties of 304H
material will always be better in the solution annealed condition.

Best Regards,

Herman Pieper

On 21 okt, 09:39, "agstes" <ags...@gmail.com> wrote:
> Dear All,
>
> Is there any change in chemical properties prior to solution annealing and after solution annealing of SA 213 Gr. 304H ( solution annealing temp 1040 degree centigrade) e.g. % of carbon specifically.
>
> Thanks well in advance.
>
> Regards,
>
> Shinde

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[MW:34820] RE: 34813] Clarification in Rate of heating and cooling.

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