Can stainless steel corrode?

Austenitic steel is the most common type of stainless steel, accounting for up to 70% of all stainless steel production in the world.

Blue Wave A/S production contains mostly of Austenitic steel, more preciously EN 1.4401/4404 or AISI 316/316L.

Despite the fact, it is called stainless steel there are some factors that can cause pitting corrosion. One of the factors we tend to forget is high temperature in connection with high salinity environment.

 

temperature- pitting“PREN is a guideline formula for calculating the properties of stainless steel and their resist against pitting. The higher value of PREN the higher pitting corrosion resistance “

In above chart the preferable environment can be observed for stainless steel to remain stainless.

 

sea

“Ocean salinity is generally defined as the salt concentration (e.g., Sodium and Chloride) in sea water.  It is measured in unit of PSU (Practical Salinity Unit), which is a unit based on the properties of sea water conductivity. It is equivalent to per thousand or (o/00) or to g/kg.”

One of the risk zones that can be mentioned, referring to above world map, is the Mediterranean Sea – Due to the temperature which easily can top 40 degrees and with high contain of chloride in the ocean.

How to avoid pitting corrosion

The best way to maintain your stainless steel items, from being affected by pitting corrosion, is by rinsing your items once and a while. Especially mentionable when it haven’t rained for a while!

Time is the magic word here – The longer the salty liquid allows to be applied, the more aggressive/quicker reaction can be expected.

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