ISO 10382

[dog241]

Hi,

I have manufacturer to make some kind of Guard rail to be used in ocean.
The guard rail is made of SS316 or 316L. However, I need to know how well the material can be resistant to corrosion. I am wondering what kind of ISO standard should be referred to for testing.
Is ISO 10382 commonly used?

Please advise

Regards,
MK

 

[EdStainless]

S31503 is commonly used in coastal applications.
There are specs (I don't know the ISOs) for the passivation of SS.
There is no reason to corrosion test, if the passivation has been done correctly.
If there are no crevices or pockets in the assembly, and it gets washed with fresh water regularly (rain) it will survive this exposure. This alloy will not stand up to direct (or intermittent) seawater exposure.

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P.E. Metallurgy

 

[kingnero]

EN ISO 9227 is commonly used (salt spray test), I don't know ISO 10382 so can't comment on that.

Can I hijack this thread and ask an additional question?
I know austenitic stainless steels like 304 and 316 have a very limited corrosion resistance, especially when chlorides are present.
However, SCC list as conditions to occur, also elevated temperatures (from memory, starting somewhere at 60°C/140°F).
Exposure to sunlight (where I live) doesn't heat up materials to that temperature, but SCC still occurs.

Am I not understanding this correctly, or do the textbooks underestimate the SCC phenomena, or is there still something else at play that I'm not aware of?

 

[EdStainless]

SCC in a clean Cl environment for 304 and 316 sets in about 125F or so, depending on stress and surface corrosion.
But you can get SCC with organic chloramines at temps like 75F.
This is what caused the equipment and roofs to fail in swimming pool buildings. There is a great European case study of this effect.

dog241, the spec that describes passivation should also have the tests for it in it. There are various ways to do this, salt spray is not a suitable test for passivation.

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P.E. Metallurgy

 

[kingnero]

@EdStainless: Thx for the clarification!
I am aware of the accidents that have happened in swimming pools, I believe a committee has written a report with attached a proposition for a standard or a guideline that specifically concerns the use of materials in Cl-containing environments like swimming pools, but government/the powers that be have stopped the publication of these documents.
I'd like to read up on this, I guess I have to search around a bit to find some interesting/reliable literature...

@dog241: I searched our standards database, here are some that I could find, that might be of interest to you (can't comment on the contents though):
- ISO 16048 - passivation of stainless steel fasteners.
- ISO 16701 - salts pray test (but EdS already said this is not the way to go)
- ISO 7359-11 - SCC + Hydrogen
- ISO 11474 - Scab (see note above)
- ISO 9225 + 9227 - general corrosion
- ISO 10062 - corrosion due to contamination
- ISO 7539-7 - SCC and deformation
- ISO 10289 - corrosion testion / sampling