Hello. Can you introduce a traditional alloy or HEA, with high temperature (1200 degree) Oxidation resistance and boiling HNo3 and HCl resistance?
Dear colleague,
For almost any commercial alloy requirements are too rigorous, as you already know. 310 austenite and 446 ferritic stainless steels (2111HTR and 253MA also) are close to that but without fulfilling any of the three claims. Hastelloy C276 and C22 are corrosion-resistant but not sufficiently high-temperature resistant (similar but even slightly worse is Inconel 625 alloy). So, you are on the "thin ice" with possibilities (without HEA).
Ti alloys are not good enough (almost useless) for the application, so ... (although Ti-5Ta-2Nb alloy should be checked; see https://doi.org/10.1016/j.mtcomm.2020.101786.
W alloys (e.g., TAM 3950) are worth checking, although not convinced about corrosion resistance. Niobium-Tungsten Alloys and Tungsten Carbide could be the solution.
Ni-Nb-Zr-Ta is also a suitable candidate (see MaterialsTransactions, Vol. 50, No.6 (2009) pp.1304-1307).
Zr (alone) or Zr2.5Nb could be good enough.
Last but not least, Nb and some Nb alloys (e.g., C103) and Ta alloys (Ta – 2.5% W or Ta-10%W) could be the best for the required environment.
Otherwise, you should find some High Entropy Alloy (not as familiar to me as conventional).
Regards (and wish you luck in the research)!
P.S.
doi: 10.1177/0885328220970756
This could be interesting (it is new for me, I do not know the properties, and it is potentially for medical application; however, the composition is promising (for Ti 20%)).
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