AISI 420
AISI 420 GENERAL. The steel GGD 420 is a martensitic stainless steel having excellent response to heat treatment of quenching and tempering, can be hardened to maximum hardness between 48 and 52 HRC. ... In hot runner molds, subject to intense atmospheric humidity and injection of abrasive polymers such as, for example, thermosets (Bakelite ...