Is it what I have here? First time seeing this in this steel. HT was 1080 C, plate quench, LN2, 175 C 2x2 hrs. 63 Hrc.
It is RWL-34What was the steel.
I don't think an auto-hamon is possible in an air hardening steel.
My suspicion is it is a manufacturing/rolling artifact.
more extreme then im used to seeing but could be. all none PM steels can have this happen. i know for sure i could look at cpm154 vs 154cm and tell the difference