I don't know the answer to your question, but I'd be more concerned with the validity of the material certifications and with the process control at the manufacturer (heat treat, machining, grinding, etc.).
If you do find someone selling gears made from your chosen alloy, just make sure they didn't pencil-whip a "Alloy 9310" material certification while actually selling you shit gears made from melted down Yugo bumper brackets.
the cert. should say something like
"Chemical Analysis per ASTM XXXX . . ."
"Deese are bestest Steel Metal of 9310 Alloys with most happy strongness and supreme durables . . ."
Not saying you shouldn't pursue a given material, just saying "trust, but verify" - mostly verify.
PLEASE BUY AMERICAN SO I DON'T HAVE TO LEARN CHINESE
-The 4th little pig made his house of reinforced concrete, with wolfskin rugs in every room-
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