Quenched and tempered steel with high temperability and toughness thanks to the high chromium content. It can be quenched and tempered at high resistance values and offers hardness consistency and uniformity. Generally used for pinions and shafts. Has average machinability on tool machines. Can be nitrided at the quenched and tempered state to increase resistance to wear and the fatigue limit.
Equivalent or similar:
AISI 4340, SAE 4340, G43400, SEW 310, SEW 550,30NCD8,
ASTM A 29 4340, SNCM431, BS 823M30, 3KH3M3F,
DIN EN 898-1 class 10.9 and DIN EN 898-2 class 10.0
