Suitability of 4140+ENP at low temperature

[SUTA]

We are buying LCC ball valves. One manufacture offered 4140+ENP for Ball & Stem. Our MDMT is -45C. Would you please advise if the offered material is suitable for low temperatures?
Thanks in advance.

 

[metengr]

Ask the manufacturer if the proposed material is acceptable for use at MDMT - in other words impact test data.

 

[metengr]

Here is a general reference for use in valve material selection based on service temperatures. Warning; this is only a guide.

http://productionvalves.com/products/cast-body-ball-valves/material-specifications/