Nil Ductility Temperature or Ductil to Brittle Transition Temperature

[commocheck]

Does anyone know where I can locate the NDTT or DBTT (Nil ductility or ductil to brittle transition temps) for 174-h900?

Thanks

 

[commocheck]

I meant to write 17-4 h900, instead of 174-h900. Sorry for the mix up.

 

[metengr]

I couldn’t locate specific impact energy data below room temperature in the literature I have for 17-4PH in this heat treatment condition. At room temperature, the value reported is about 20 ft-lbs minimum CVN impact energy at the 900 heat treatment condition*. Below room temperature, the impact energy for this heat treatment condition is going to decrease in value so if there is a so-called DBTT it might be above RT, if you can find CVN data at elevated temperature.

*Source; "Handbook of Stainless Steels" by Peckner and Bernstein

 

[EdStainless]

Cartech data
H900 RT CVN 16 ft-lb typical

But, in another table for H925
75F 30 ft-lb
10F 16 ft-lb
-40F 9 ft-lb


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[commocheck]

Many thanks. This is exactly the info I've been looking for.

 

[Flesh]

From Armco 17-4PH

H900 CVN Ft-lb
75F 19 ft-lb
32F 18-20 ft-lb
-40F 7-9 ft-lb
-80F 8 ft-lb
-320F 3-4.5 ft-lb