Rusted Stainless Steel Plate

[farhanjnawab]

Dear All,

Background :

Stainless Steel Grade 316 plates were cold bended to manufacture 150x80 L angles for fixing access ladders at marine pier.

Problem :

After a few days of the installation of these ladders, the stainless steel angle plates used at the joints were found to have a layer of rust. Our Clients are of the opinion that the material may not be 316 grade, but at the same time we have verified the grade by testing it chemically and found moly % 2.3 (2-3 for 316 grade)

Question :

What is the reason for such rust? Any remedy for the same ??

Please Help

 

[EdStainless]

My guess is that the parts were not passivated after forming. They used regular steel tooling and there are small particles of iron embedded in the surface.
You need to clean it before pitting starts.
You may need to remove them since I doubt that you are allowed to let the acid run into the waterway.
There are solutions available that work and are fairly safe.

http://www.citrisurf.com/

If you let this start to pit then it will keep corroding.

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Plymouth Tube

 

[strider6]

Hi

You can find a list of useful paper on stainless steel passivation and cleaning:

http://www.corrosionist.com/pickling_cleaning_passivation_of_Stainless_Steel_library.htm

http://www.google.com/cse?cx=010231...=UTF-8&q=stainless+steel+passivation+cleaning

hope this help u

S

Corrosion & Rust Prevention Control

 

[asbjornr]

Hi, We are delivering stainless steel equipment to ships. When we are delivering equipment like this and without coating, I always spesify material of 316L grade or 304L because of the marine conditions.

asbjornr