Hi.
In the current project I'm dealing with water which has the following
specifications (supplied by the client) -
PCW Closed Loop On-Going
RCP
pH 8-11
Conductivity microS/cm
I would use the 303 only if the required machinablity of the part
justified it.
The stainless steel groups regardless of specific alloy choice
requires do care during fabrication to prevent iron (from carbon tool
steels) contamination. Solution alloy treatment after welding (if
possible), passification using nitric acid (or other oxidizing acid to
remove free iron particles), and argon sheilding inside pipes for
welding are fabrication steps often missed.
Stainless steels are suscepitble to pitting and crevice corrosion
occuring from iron metal contamination.
Ed
Your water analysis is missing the chloride content. Since it is one
of the important factors controlling selection of a stainless steel to
resist crevice corrosion, I cannot tell you whether 304 will be
acceptable or if you will need 316. Typically 304 will work to about
50 ppm, and 316 to 250 ppm.
There is a detailed 20 page reference booklet on =93Fabricating
stainless steels for the water industry=94 that you can get for free
from the Nickel Institute. It is Nickel Development Institute
publication No 11026. See Appendix C. You might also want to look at
some of the other references shown in this publication.
Go to:
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On the top of the page is a box labeled =93Nickel & Its Uses=94. Click on
it. On the right side of the page is a column with a box labeled
=93Technical Literature. Click on it. Change the search box under
Technical Literature Locator to be by Catalogue No., and put in 11026.
Then you can download the book.
(You may have to register if this is the first time at the site).
Stainless steels also are discussed on the Corrosion doctors web
site.
Rouging is discussed at:
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Pittsburgh Pete
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