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on the other side- are those chips or curls?

There's that 8tape bevel line. :D
It's obvious now that you say 30x. Of course. I think you'd need a bit higher be sure there is no visible corrosion....

pretty cool. caustic cracking. As I was reading along I thought corrosion could have been hiding in micro cracks. SCC is different from regular ole corrosion?
Are these effects more a concern for...

From what I have read and been told, a loss of temper is not going to cause a defect like this.

what it could be perhaps and inclusion, or the result of micro cracks caused by initial quenching,...