4340
Annealed · 200–240 HB
G434001.6582AMS 6414REFERENCE DATA
MACHINING IDENTITY4340 · Annealed · 200–240 HBDo not enter cutting parameters or quote until condition and hardness are confirmed.
ISO GROUPISO P / H
HARDNESS200–240 HB
MACHINABILITY2 / 5
CONDITIONAnnealed
FAMILYHigh-strength steel
UNSG43400
EN / DIN1.6582
ASTM / AMSAMS 6414
MAIN INDUSTRIES
Shafts, barrels, critical structural applications. The machinability score changes with the selected condition.
MACHINABILITY SCALE
1EasyAluminium, magnesium, low-carbon steel. The problem is distortion and chip evacuation.
2ModerateFerritic/martensitic steel, boiler steels, cast valve materials.
3DifficultAustenitic and PH stainless, standard duplex, CP titanium.
4Very difficultSuper duplex, super austenitic, Ti-6Al-4V and beta titanium, hardened steel.
5ExtremeNickel- and cobalt-based superalloys, refractory metals, turbine castings.