Let's not get silly here. All steel gets brittle in cold weather. It's just a question of how cold it needs to get to break in normal use versus breaking it with a hammer or similar tool...
silly? what part of ColdOne's post didnt you grasp? -40, strong as hell. Perhaps you have a different understanding of "brittle" than I. <img src="/ubbthreads/images/graemlins/barf.gif" alt="" />