Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
PH resistance of SS316 material
- Thread starter friend81
- Start date
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.
- Thread starter
- #3
- Thread starter
- #4
EdStainless
Materials
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.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
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.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
- Status
Similar threads
- Locked
- Question
- Locked
- Question