Lets go ahead and just make one out of ATS-34 (Hitachi trademark) or 154 CM (Crucible steel). That away if you sharpen the flanges they will hold a real good edge (J/K) . As for heat 154 is used in militairy jet turbines!!!! Haa Haa, imagine how much that would cost!!!!
BTW-I have mild steel but wish I would have gotten stainless.

 

I want mine in Titanium with O2 & EGT flanges and Jet Hot coated black so the smog guy doesn't see it.