321 Stainless Steel Casting 1

[Lemona]

I found 347 stainless steel casting valves installed in 321 stainless steel piping. Based on my memory, I never have seen any 321 casting material.
Could somebody enlighten me why there is no 321 casting?
Thanks a lot!

 

[btrueblood]

321 contains titanium for chromium carbide stabilization; Ti will oxidize rapidly in the melt if exposed to air (e.g. in typical sand/investment casting processes). The columbium-stabilized alloy 347 is replicated by cast alloy CF-8C. Columbium I think is quite a bit more stable in the melt.

 

[EdStainless]

There are some cast stabilized grades with a bit of each Ti and Nb (it hasn't been Cb since the 1940's). You can cast 321, but you are more likely to have large oxide inclusions.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[arunmrao]

You can make 321 castings with Ti additions.There is a minimum Ti requirement which is related to carbon content.

To make this large addition of Ti is a difficult issue. You have to take in vaporisation loss, fading effect, gassy metal(due to excessive FeTi addition).

Last year I made some castings in 321 ,but these were the problems faced

" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke

 

[btrueblood]

"it hasn't been Cb since the 1940's"

Bah. The Europeans robbed Hatchett of the credit for discovery. And I'll keep eating my freedom fries until they change back.