Chloride Concentration on Pitting Resistance 2

knowkeys · Sep 16, 2003

I was wondering if anyone has had any experience or can provide guidelines on an acceptable level of chloride.

I have an application where a "super duplex" pipe (25Cr) with a pitting resistance number > 40 is exposed to seawater (not flowing) . The concentration of NaCl can be reduced, however, I need guidance on the minimum acceptable level to prevent pitting.

Thanks

mcguire · Sep 16, 2003

This has been well researched. One needs to know the temperature, however. Also, what is the surface condition? And has it been welded?

knowkeys · Sep 16, 2003

Thanks for the prompt response

The temperature will be between 5 and 15 deg C.
The pipe is welded but has been coated. The surface should be in good condition. This will be the worst case.

Can you provide a link or reference to the research.

mcguire · Sep 17, 2003

There is a great collection of papers on this topic in "Applications of Stainless Steels '92". I would also recommend the the AvestaPolarit website. You can enquire there dirctly. They pioneered these grades and are the most expert company in their use. (The best advice is right here)

knowkeys · Sep 18, 2003

That is an excellent website and I was able to make use of the information provided. Thanks very much.

Metalguy · Sep 18, 2003

Knowkeys,

So give him a red star if he helped you!

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