PH resistance of SS316 material

[friend81]

I am curious about what will be the PH handling capacity of SS316 material. When pumps are made with SS304 manufacturers are recommending for a PH of 6.5 to 8.5.

Hence what will be the PH range for SS316 material.

 

[metengr]

What is the specific fluid medium? pH alone is not enough to provide information regarding limits of use. You need to know the temperature and if you have any halides (like chloride or fluoride ions in solution). The 316 ss has molybdenum for increased general and pitting (from chloride) corrosion resistance and elevated temperature strength.

 

[friend81]

The pumped liqiud will be Borewell(deepwell) water.The underground water in our area has a PH of 11 to 12 and also the water has Caco3.

And also i would like to know the corrossion resistance of SS304 against water with ferrous oxide.

 

[friend81]

the temperature of liquid will be maximum of 40C.

 

[EdStainless]

There are general relationships for the tradeoff between temp, Cl and pH in stainless grades.
For 304 the drop in pH of 1 is roughly equivalent to raising the Cl by 10x.
In 316 you have to drop the pH by 2 to see the same impact on pitting corrosion.
In other words, if 304 works at a specific temperature, Cl level and pH; then you could use 316 at the same temp, Cl level and a pH that is roughly 1 to 1.5 lower.

This is only a rough estimate. You need to know specifics before you can really talk about limits.

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