A2 TOOL STEEL - RAW SET DATA

Data numbers in the charts is the number of the impact roller cycles with the resulting sharpness.
E.g. “ x1 = 150, x2 = 300 “ means after 1 impact cycle the edge sharpness is 150 BESS, after 2 cycles 300 BESS, and so on.

A2 Tool Steel Sample →	HRC 54	HRC 62
Initial Sharpness BESS	109	114
SHARPNESS BESS	x1=282 x2=300 x3=334 x4=332 x5=349 x15=384 x20=410 x25=428 x30=464 x35=467 x40=496 x45=526 x50=559 x60=593 x70=551 x80=567 x90=599 x100=637	x1=235 x2=278 x3=320 x4=307 x5=314 x15=356 x20=351 x25=352 x30=366 x35=365 x40=390 x45=393 x50=421 x60=402 x70=383 x80=406 x90=399 x100=376 x110=444 x120=474 x130=433 x140=442 x150=438 x160=436 x170=464 x180=400 x190=426 x200=452 x220=438 x240=460 x260=435 x280=428 x300=453 x320=441 x340=461 x360=487 x380=486 x400=457 x420=466 x440=441 x460=455 x480=426 x500=468 …

Key indicators	HRC 52	HRC 64
Average of sharpness scores in the first 5 impact cycles (Phase I - elastic deformation)	319	291
Average of 3 sharpness scores: after 40, 45 and 50 impact cycles (Phase II - elasto-plastic transition)	527	388
Overall average sharpness over 100 impact cycles	460	356
Number of impact cycles to turn the edge blunt at 500 BESS	45	Over 500