I just forged out a knife from John Deer control shaft and it is some great stuff. It is 5160 but the alloying is proprietory. Dan Gray just sent a box of 1.2" x 8" round bar. It also machines real nice. Filing and grinding was very easy w/o annealing after forging. If I can get my hands on some more I would like to forge out many more knives out of it.
Before I forged any of it I sliced a disk off and hardened it (no tempering). After securing it into my vice I smacked it and it broke like glass.
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