I agree that this is the wrong material for this application because
in this temperature range you will get Chromium carbides as well as
Sigma fase present as precipitations on the grain bounderies which
will influence the clad layers corrosion resistance. The material
SS347 is a more common used metarial for high temperature application
and is also often used at power plants because of its enhanced
properties against creep. So for this aplication I would say this will
be a much better choice, but depends also on the content of the
equipment. Why did they choose 304L? When changing to 347 material you
will have material with high carbon content, is this acceptable?
Best regards,
Herman Pieper
On 28 nov, 16:47, "sachin sankhe" <sachin.san...@rediffmail.com>
wrote:
> Dear Freinds,
> I have query on below subject
>
> We have got main colum section of FCC unit wherein base metal is LAS cladded with SS304L.This requirement in specified by UOP Process Licensor
> However design temp of Main column is around 55o deg.C
> Under this circumstances,I feel SS304L is not suitable at this temp since it will result in formation of chromium carbide at grain boundries.
> I feel UOP shall have specifed SS347.
> Kindly share your knowledeg
>
> Regards
> Sachin
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