A few cave shops back in the day would put tanks
in ice water
before they filled them to get more air in. Cute sales trick
Anyway that tank can take temps that would be insanely low, if there is a weak point, itís the O ring between the tank and valve, super low temps could harden the rubber O-ring and maybe blow it, but even if that happened itís child play to replace one and any dive shop should have new ones.