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

See also

RA50YW

Through hardening steels

GKH

Steels for nitriding

GKP

Steels for nitriding