The weight is the biggest determinant in selection of the foundry - it is fairly high and will preclude many foundries. I believe you would be best served with a foundry with AOD capabilities, both Atlas and Achison have them, as does MetalTek in Waukesha WI. Other than that, in the USA things...
I think that for most applications, especially in chlorides, the use of duplex materials offers substantial improvement in yield strength. With the present price of nickel, etc. the use of 2205 duplex may make sense - however, I would carefully check qualifications of suppliers. The material...