[ASK] HOW TO DETERMINE TEMPERATURE DE-RATED YIELD STRENGTH 4

[Rizkyffq]

Hello guys,

As title of this thread, maybe someone here has expertise on this.
In my design standard, for some component need to calculate reduction of yield strength by specified temperature condition (which in this case temperature in actual field is more than 300 F).
I already seek the references for reduction coefficient, but as i searched no one mentioned about reduction coefficient for material AISI 4140.

Does anyone know how to determine it by equation or this coefficient may get through experiment or any standard ?

Before many thanks,
regards.

 

[EdStainless]

They are in your design code, such ASME B&PVC.

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P.E. Metallurgy, consulting work welcomed

 

[jmec87]

API 6A Annex G

 

[Rizkyffq]

Thanks sirrr