Maraging steels
ML18PQ
Spécifications
EU
X2NiCoMo18-8-5
USA
UNS: K92890
AMS
6512
AIR
E-Z2NKD18
WL
1.6359
BS
S162
Composition
C
<0.03
Ni
18
Mo
5
Ti
0.5
Co
8
Applications
• High strength and fatigue stressed rotation parts, mainly used for turbine shafts, compressor shafts.
Characteristics
• Precipitation hardened margaging steel vacuum melted and consumable electrode remelted
• High yield strength and good impact strength
• Good weldability, high cycle fatigue
• Surface hardening by nitriding is possible.
Mechanical properties
| Heat treatment |
UTS (N/mm²) |
0,2% YS (N/mm²) |
A (%) |
KCU (J/cm²) |
|---|---|---|---|---|
| H + V 480°C | 1850 | 1780 | 9 | 40 |
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 |