High temp helium service

[gustorf]

Hi all.

What cast material would be used for a valve body in Helium service, temperature up to 350°C, pressure max 90 bar?
We were informed, that under these condition Helium tends to creep through any kind of casted material so only forged material to be used.

 

[btrueblood]

Cast grey iron is one of the easiest materials to cast without voids. But, it's still a sieve compared to forged steel or forged brass. Why would you not want to use a forged valve body?

 

[europipe]

I agree with btreublood.
I´ve seen specs with that conditions using
forged CS gatevalves acc B16.34

 

[JLSeagull]

Forgings lack the pathways that exist in castings.