molten tin and Hastelloy

[jcnjc2]

I hve been handed the job of findinga replacement valve for our tin anode caster. I was told it is hastelloy lined and is replaced every 4 onths due to leaking. It shows signs of pitting and the tin in bonding with the Hastelloy. Can anyone tell me a good coating to use instead of Hastelloy?

Thanks

 

[joeswoes]

Whats the temperature ? Can Teflon be used ?

 

[jcnjc2]

Temp is 450 F - 500 F. That's at the top of the range for Teflon.

 

[btrueblood]

http://www.crucibleservice.com/products/hotWork/index.cfm

... as a start. This from a Google search using the terms "tin die casting mold steel".

 

[rorschach]

Perhaps a conventional steel valve that has it's wetted areas flame sprayed with Alumina might be a cheaper alternative.

 

[jcnjc2]

Great tips. I will investigate all of them. Thanks so much.