Quenched, 540°C temper, 525°C nitride for 40 hours with 20-30% ammonia dissociation, hardness of 88 HR15N case hardness at 0.635-0.762 mm nitrided case depth |
UNS G98400, AMS 6342 C, ASTM A274, ASTM A322, ASTM A519, SAE J778, DIN 1.6511, UNI 38 NiCrMo 4, B.S. 816 M 40 |