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Melting iron and stone is very reasonable considering the calcs we already have for Smaug and Ancalagon, but at the same time they aren't overly relevant because of that (unless we make a general Dragon page at some point)Been off for a bit but during that time I've read a lot of Tolkiens works. Not sure what the current discussion is atm so if I could be put up to speed that would be good.
For Dragons I wanna add that Fall of Gondolin states Dragon fire can melt stone and Iron and I believe also Children of Húrin. Both Glaurung and Smaug also desolated several miles of land but I feel those events might be too vague.
As for speed I'd argue Dragons are around the level of Maia since Gandalf considered Smaug a being of immense power in the Unfinished Tales, so most likelt they can scale from the Balrogs flying from Angband to Lammoth.
If not I assume they scale to the Fell Beasts winged speed which accordong to Gandalf can cross at least 200 leagues in a few hours, assuming 3 hours that's 230 MPH or 370 Kilometers per hour.
Dragon scales are harder than Iron according to Fall of Gondolin and Children of Húrin and also comparable to even Mithril in the Hobbit when Thorin showed the Mithril shirt to Bilbo
The canonicity of Tolkien's writings is a rather messy thing, but as long as it's not contradictory, or from a plainly discarded or outdated work, I believe it should be fine.
Scaling Smaug to the Maiar feels rather iffy to me. Sure, the Winged Dragons of the First Age were Morgoth's trump card, even compared to the Balrogs, but Smaug was born in the Third Age (being young in his attack on Erebor) and we know little of how he compares to his forebearers. Gandalf considers him a dangerous being, but he's speaking in the context of Middle-Earth as a whole, and whether he was personally threatened by him is unknown (plus we see Gandalf considered the Necromancer a graver threat, and he was able to drive off this weakened Sauron with the rest of the White Council).
The Fell Beast scaling should be fine, although we might need to put it down as a "possibly" or "likely" as this assumption relies on Smaug being stronger than a fell beast.