AISI	American Iron and Steel Institute
CHT	Conventional heat treatment
CT	Cryogenic treatment; cryo-treatment
SZT	Sub-zero treatment
EDX	Energy dispersive X-ray spectroscopy
PM	Powder metallurgy
HSS	High-speed steel
ECs	Eutectic carbides
FCC	Face-centred cubic
SCs	Secondary carbides
SGCs	Small globular carbides
RA	Retained austenite
CVN	Charpy V-notch (impact energy). Note: the values of CVN toughness were obtained by room-temperature testing unless otherwise indicated.
KIC	Fracture toughness (critical stress intensity factor)
Ka	Apparent fracture toughness
HRC	Rockwell hardness
HV	Vickers hardness