“…Despite considerable inconsistencies in the test conditions (counterpart nature, load, sliding speed, and distance), some general outcomes can be derived. For AISI H11, H13, and H21 steels, a 16-24 h treatment at −184 • C (or −185 • C) was recommended to achieve the lowest wear rate against steel counterparts [19,49,51,122,199,200,[259][260][261][262]269]. However, when hard alumina counterparts were used for wear performance examination, after CT at −180 • C for 32 h, there was only a 12% wear performance improvement in H13 steel [267].…”