PH 15-7 Mo SS compatibility with DI water...

[quizzical1]

Hi everyone,

Can anyone steer me to a chemical compatabilty chart for PH 15-7 Mo SS in DI water?

 

[strider6]

I think you've to look on the NACE Cor-Sur, but in my opinion this material doesn't have problem with DI water.

regards

Vict

http://www.corrosionist.com

 

[EdStainless]

At room temp I suppose. How concerned about ion pickup in the water are you?
It won't be as good as 316L, but it is the best of the PH grades.

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[quizzical1]

Not sure about the ion pickup - the application is for a water-water mixing valve (cold / hot) with max temp of 200F.

I'm guessing we should play it safe with 316L?

 

[strider6]

Maybe i've not understood well, but DI means de-ionized water?
Or there is something else ?
I think that every SS could perform well in DI water but to be sure it's necessary to know excatly the composition and conditions.

regards

Vict

http://www.corrosionist.com

 

[quizzical1]

Hi Vict,

You would think so, but we have physical evidence that DI water pits most 300 series SS other than 316SS...

Glenn

 

[quizzical1]

Sorry, didn't mean most....at least the 302, 303 and 304 SS materials we've used in past applications.....

G~

 

[EdStainless]

I would suggest something better than 316L for hot service. I always worry about external CSCC. You would have better pitting resistance, strength and CSCC resistance from alloys such as AL-6XN or 2205.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[strider6]

Hi Glen

It would be necessary to know exactly the composition of the water you are considering. To me seem very strange that a 304 SS would pit if you don t have any chloride in the water. Also pitting depends on aeration of the water and other factors.
Is it a mixing valve? could be cavitation? there are so many explanation for a failure that it would be necessary to have all the information to give a reliable material selection.

Vict

http://www.corrosionist.com