GKP
GKPW
GKPYW
Spécifications
6497
6498
Composition
Applications
• GKP® is used to produce nitrided parts which need to be extremely stable after hardening and tempering treatment.
• It is particularly suitable for deep nitriding.
• Gears, crankshafts, precision parts, aircraft parts.
Characteristics
• Nitriding steel with an excellent level of hardenability and particularly high mechanical properties, impact strength and fatigue limit.
• It may be nitrided in the heat treated condition with a core strength of 900 N/mm2 to 1450 N/mm2. The nitrided layer is not brittle.
• In comparison with other nitriding steels, GKP® allows the nitriding process time to be reduced by up to 40 % for the same nitrided layer depth.
• With the same nitriding process time, GKP® results in a depth gain of up to 0.2 mm. GKP® makes it possible to obtain nitrided layers with a depth of 0.9 mm.
Mechanical properties
| Heat treatment |
UTS (N/mm²) |
0,2% YS (N/mm²) |
A (%) |
KV (J) |
|---|---|---|---|---|
| T + Rv 640°C | 1250 | 1175 | 15 | 80 |
| T + Rv 660°C | 1130 | 1060 | 16 | 110 |
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 |