Use of SS above maximum operational temperature and SCC

[bodildra]

Hi,

I am currently working with material selection for a topside platform. From our process engineers, we have received an interesting question regarding time above the maximum operational temperature and danger for (Chloride-induced)SCC.

In NORSOK M-001 it is specified that the maximum temperature limit to avoid SCC for SS 6Mo, is 120*C. However, it is often said in various material selection reports that it is OK to be above this temperature in short periods of time. The question I got from the process engineers is: how long is a short period of time, in the above case.

Any input?

 

[EdStainless]

What is the risk of failure?
If it is long enough to initiate corrosion then you may have SCC.
Hours could be serious problems.

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Plymouth Tube

 

[TVP]

I agree with EdStainless, anything more than minutes can be problematic.