Corrosion of 304SS
Corrosion of 304SS
(OP)
I have a 80' high tank operating at 300 F and 100 psia made out of 304SS. We have been recently seeing problems at the bottom of the tank of leaks due to corrosion. A sample was taken and the following concentrations were found at the bottom
pH Acetic Formic Chloride Sulfate
ppm ppm ppm ppm
4.7 172.8 535.5 35.9 29609.9
4.4 395.1 748.3 43.7 22456.1
4.3 365.8 742.1 50.1 18122.1
4.3 209.5 677.6 47.3 13529.7
4.3 176.7 614.9 34.5 11455.9
4.3 128.2 609.1 36.7 22146.5
4.1 135.7 627.7 34.4 24384.2
7.0 543.3 850.2 42.3 17686.2
We may have had a process change recently, but the tank has been in service for about 20 years. I wanted to know if anyone can direct me towards some reference showing the corrosion rates of 304SS with different concentrations of these chemicals.
pH Acetic Formic Chloride Sulfate
ppm ppm ppm ppm
4.7 172.8 535.5 35.9 29609.9
4.4 395.1 748.3 43.7 22456.1
4.3 365.8 742.1 50.1 18122.1
4.3 209.5 677.6 47.3 13529.7
4.3 176.7 614.9 34.5 11455.9
4.3 128.2 609.1 36.7 22146.5
4.1 135.7 627.7 34.4 24384.2
7.0 543.3 850.2 42.3 17686.2
We may have had a process change recently, but the tank has been in service for about 20 years. I wanted to know if anyone can direct me towards some reference showing the corrosion rates of 304SS with different concentrations of these chemicals.
-Mike





RE: Corrosion of 304SS
Secondly, try the NACE Cor-Sur database if you can find a NACE member able to log in at www.knovel.com
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Corrosion of 304SS
I would expect field welds (with heat tint and residual ferrite) and locations where sludge can accumulate (and form crevice conditions) to corrode first.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Corrosion of 304SS
Do you have a graph or online reference of this?
-Mike
RE: Corrosion of 304SS
RE: Corrosion of 304SS
http://
and here you can find other corrosion data for SS
h
S
Corrosion Prevention & Corrosion Control
RE: Corrosion of 304SS
MTI = Materials Technology Institute