Corrosion of 1.4003 ("3CR12") in chlorides. 2

[enmax]

Is grade 1.4003 steel (also known as 3CR12) suitable for containing water with a chloride content of 100ppm, neutral pH, ambient temperature. I have a second case with 1000ppm chloride - again neutral pH, ambient temperature. I guess general corrosion would be low but pitting and crevice corrosion are likely but at what sort of penetration rate? This information is hard to come by!

 

[gr2vessels]

roberts12,
This is the "poor man's stainless steel" intended for use in light corrosive environment like 100 ppm chlorides and relative erosive materials. It is suitable for coal handling facilities, train carriages, etc. It will corrode in time, but much slower than carbon steel. I'm not sure if the 3CR12 is available any longer, last I heard it was replaced by 5CR12. I worked with this material on the basis of 0.8 mm/year corrosion rate and 1.2 mm/year erosion rate in brown coal handling facility, temperature around 60 deg C. Please note that there is a wealth of information from Columbus and many other studies in the last 8 - 10 years.
cheers,
gr2vessels

 

[EdStainless]

You might have success at 100ppm, but not 1000ppm.
If you have any scaling, fouling, or microbiological issues the local pitting rate could easily lead to leaks within a week or less.
For the higher level look into some of the lean duplex grades (LDX2101). These alloys are strong and you can use a lot less metal.

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Still trying to help you stop corrosion.
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eblessman@plymouth.com
or edstainless@earthlink.net

 

[strider6]

Is your water oxygenated or oxygen free? if you don't have oxygen and the water is a closed system a carbon steel could be ok.. Corrosion is a complex issue and is necessary to know everything about thew environment, fluid and operating condition to assess the right material..
Regards
S.

http://www.corrosionist.com