The uranyl carbonate processing recipe produces steam at 750 degrees despite nothing in the game deriving value from the extra temp over 500. Out of curiosity, why did you make it this way?

Initially it was lower (but above the 300 mark for regular steam boilers) , as I didn't want the player to use it for too much power, but someone wanted more power, so I set it higher. The number itself is fairly meaningless - as your quite right, functionally it just needs to be above 500... I figured maybe in tandem with other mods who need higher temp steams it might have interesting side effects I suppose, so halfway between 500 and 1000 felt like a reasonable choice.

Interesting. I've not personally encountered any mods that use steam temps higher than 500, but I guess that doesn't mean they're not out there.