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°C | 1080 | 900 | 19 | 170 |
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 |