Re: [MW:7626] SA-335 Grade P12 and P22

Hi Navid :

Higher Cr content will certainly bring better resistance to elevated temperature. So first of all please check your operatiing temperature.

Secondly,Due to above reason by using P22 tube your designer could select  thinner wall thicknes and thus reducing hanger load, which further also reduce top support beam size.

From corrosion point of view P22 have better resistance to Flow assisted corrosion as described in below paper
http://hcasia.safan.com/mag/hca0910/t40.pdf

Thanks
Richard Bonardo

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From: Navid Navidi <navid_751400@yahoo.com>
To: materials-welding@googlegroups.com
Sent: Mon, 18 October, 2010 11:55:05 AM
Subject: [MW:7625] SA-335 Grade P12 and P22

hi all,

what is the main practical difference between these two alloys:
1-  SA-335 Grade P12 (USA / ASME) Cr(0.8-1.2) Mo(0.44-0.65)
2-  SA-335 Grade P22 (USA / ASME) Cr(1.9-2.6) Mo(0.8-1.1)

Is it possible to substitute the second item with first one?
We are going to use them in boilers?

thanks a million


     

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