Steels for nitriding

GKH

GKHW
GKHYW

Spécifications

EU
33CrMoV12-9
USA
UNS: K24340
AMS
6481
AIR
32CDV13

Composition

C
0.3
Cr
3
Mo
1
V
0.2

Applications

• GKH® is used to produce nitrided parts which need to be extremely stable after hardening and tempering. It is particularly suitable for producing parts for deep nitriding.
• Gears, crankshafts, precision parts, aircraft parts.
•Bearing rings working up to 400°C.

Characteristics

• Nitriding steel with an excellent level of hardenability and particularly high mechanical properties, impact strength and fatigue limit (GKH®W and GKH®YW grades).
• It may be nitrided in the heat treated condition to obtain a strength from 900 N/mm2 to 1350 N/mm2. The nitrided layer is ductile.

Mechanical properties

Heat
treatment
UTS
(N/mm²)
0,2%
YS
(N/mm²)
A
(%)
KV
(J)
T + Rv 600°C 1250 1060 15 130
T + Rv 660°C108090019170

Key to heat treatment symbols

Solution treated H Annealed R
Thermo-mechanical treatment TM Quenched and tempered T+RV
Sub-zero treatment F Solution treated and aged H+V

See also

ARMAD

Through hardening steels

GKP

Steels for nitriding

FND

Steels for carburizing