5A,6A vs 6% Mo stainless in desalination process.
5A,6A vs 6% Mo stainless in desalination process.
(OP)
What are your thoughts gents about the pitting and crevice resistance of the cheaper 5A and 6A (CE3MN, CD3MWCuN) Duplex vs. the AL6XN, 254SMO (CN3MN,CK3MCuN).It is for pumps and valves in a desalination plant. So I asume seawater. The PRN or CPT in the literature is fairly similar especially if one tweak the Nitrogen in the duplex. Is the extra cost worth the seemingly small increase in performance (with 45$/lbs Mo....)?
Gerard
Gerard





RE: 5A,6A vs 6% Mo stainless in desalination process.
I don't know that they will cost any less. They are still made from premium melt stock, they must be annealed, and they are not easy to machine.
You can get by with a slightly lower PREN using a duplex. The calculation does not put the alloy families all on the same line. A superferritic with PREN of 35 will have the same G48 CCCT as a superduplex with 40 and a superaustenitic with 45. I am using PREN = (Cr+3.3Mo+16N)
If you go duplex make sure that you require A923 testing.
The last time that I looked Ni was ~$6.75 and Mo ~$35.
No joy for us. I can sell a lot more stainless when it is $4 and $6.
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Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: 5A,6A vs 6% Mo stainless in desalination process.
What about just using fiberglass pipe or HDPE?
StoneCold
RE: 5A,6A vs 6% Mo stainless in desalination process.
Gerard
RE: 5A,6A vs 6% Mo stainless in desalination process.
Good rapid quench from anneal and you should be fine.
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm