is there a material number corresponding to 25% Cr Super Duplex? I cant seem to see one in there.

Materials 340 & 342
You might give consideration to 'rolling your own' because those material definitions consider the same thermal expansion as austenitic stainless steel, whereas according to Sandvik data the expansion is closer to carbon steel than austenitic. The usual piping codes that I'm aware of don't provide thermal expansion data for this material hence I presume the conservative path adopted.

I'm sorry,
I take advantage from this topics to ask for anothers materials:

is there in Caesar a material number corresponding to

Sanicro 28 Nickel Alloy Steel
Hastelloy B3

Thanks