Steels for carburizing

FDG

FDGW

Spécifications

EU
20NiCrMo13-4
USA
UNS: K41910
AMS
6492
6493
ISO Symbol
20NiCrMo13-4
ISO Num
1.6660

Composition

C
0.2
Ni
3.2
Cr
1
Mo
0.5

Applications

• Gears subjected to high stresses, diverse parts subject to wear and fatigue in service.
• In the quenched and tempered condition: safety-critical parts.

Characteristics

• High mechanical properties.
• Good fatigue strength.
• After carburizing, quenching and tempering, the surface hardness is around 700 HV.
• For some carburizing applications, oil quenching can be replaced with gas pressure quenching in order to minimise distortion due to the heat treatment.
The mechanical properties thus obtained are equivalent to those of the FADH grade.

Mechanical properties

Heat
treatment
UTS
(N/mm²)
0,2%
YS
(N/mm²)
A
(%)
KV
(J)
T + Rv 150°C 1450 1100 13 130
1300100013110

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

FADS

Steels for carburizing

FND

Steels for carburizing

FADH

Steels for carburizing