• I think the brittleness of steel at the temperature of liquid nitrogen would be characterized by cracking or shattering after being struck really hard with a hammer. You couldn't break it and would most likely get horrible frost bite if you tried.
  • ***Some*** iron alloys like carbon steel become brittle below the brittle-ductile transition point because the crystal structure changes. Whether you can break a bit of supercooled iron with your hands depends on how hard you can swing it and what you hit it against. - could probably break a very brittle steel wire.

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