Minimum allowable temperature of 316 ss and 17-4 ss 2

[JSAkins]

I need to find out the minimum allowable working temperture of 316 and 17-4 annealled and at condition H900. I have looked in ASME B&PV Code with little success. Can anyone tell me a resourse to look up.

Thanks,

akinsosu

 

[israelkk]

Here is the quote from MIL-HDBK-5J:

"The impact strength of 17-4PH, especially large size bar in the H900 and H925 conditions, may be very
low at subzero temperatures; consequently, the use of 17-4PH for critical applications at low temperatures
should be avoided. For non-impact applications, such as valve seats, parts in the H925 condition have
performed satisfactorily down to -320F. The H1100 and H1150 conditions have improved impact strength
so that parts made from small diameter bar can be used down to -100EF with low risk. For critical low
temperature applications, a similar alloy, 15-5PH (consumable electrode vacuum melted), should be used
instead of 17-4PH because of its superior impact strength at low temperature."

 

[metengr]

For solution-annealed 316 SS, ASME Boiler and Pressure Vessel Code allows use up to -320 deg F. IF the minimum design metal temperature is colder than -320 deg F, impact testing and welding processes are limited for welded components.

 

[EdStainless]

The other thing to remember about the PH grades is that, in general, they are very notch sensitive.
Even if I was looking at 15-5 or 17-7 I would want the material in the overaged condition unless it was being strongly compressivly loaded.

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Corrosion never sleeps, but it can be managed.

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