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I've heard of using chainsaw bars before but, as Crex indicated, some might be OK but others won't be. Treat them like any other salvaged steel and do a quench test on each and every piece to determine it's suitability as a blade.
That said, I have a lot of chainsaws and extra bars around here and see nothing about them that would make me think they would make better blades than any medium carbon steel like 1065 or 1070. Considering the low cost of buying a known good piece of high carbon steel I can't see a chainsaw bar making any better blade (and maybe not even as good) as 1080, 1095 and especially not as good as O1 .....
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