Steels for carburizing
50NILYW
Spécifications
Common name
M50NIL
EU
13MoCrNiV42-16-14
USA
UNS: K91231
AMS
6278
ISO Symbol
13MoCrNiV42-16-14
ISO Num
B61
Composition
C
0.13
Ni
3.4
Cr
4.15
Mo
4.25
V
0.25
Applications
For service temperature up to 400°C:
• Aerospace bearings
• Gear assembly (integrated runway …).
Characteristics
• After carburizing and quenching, sub-zero treatment and tempering, the surface hardness is approx. 700 HV.
• The good temper resistance of this steel allows it to be used with a duplex treatment (carburizing + quenching + nitriding) to obtain a good case depth and surface hardness of more than 900 HV.
Mechanical properties
| Heat treatment |
UTS (N/mm²) |
0,2% YS (N/mm²) |
A (%) |
|---|---|---|---|
| T + F + Rv 550°C | 1400 | 1200 | 13 |
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 |