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OBEWAN,
as 885°F embrittlement has a strong time-temperature dependence, what does this particular
'ASTM procedure', you have mentioned, recommend?
My humble assumption is, it will always require an appropriate amount of time
and temperature, in order to find how long it will take the delta ferrite to be dissolved.
Isn't there any information available on these details coming from the steel suppliers?
On the other hand, I am almost sure that Henry will be able to provide you with tons of material on this topic.
Stephan