Well, amazing knife and tutorial.
I never heard before about the steel you had used. Did you know any others name?
4 13 180 others name- W-2 EXTRA, 76 MN, WNR 1.1259, DIN- 80Mn4, BOEHLER- F912
4 19 312 others name- STABIL, 80MN2V, WNR 1.2842, DIN- 90MnCrV8, BOEHLER- K720, AISI- O2