Steels for carburizing

FND

FNDW
FNDYW

Spécifications

EU
15NiMoSiCr10
USA
UNS: K51570
AMS
6494
6495

Composition

C
0.15
Ni
2.5
Cr
1
Mo
2
Si
1.1

Applications

• This case hardening steel has applications in all mechanical assemblies working at temperatures above 150°C e.g. gears, fuel injectors. It is also used for parts requiring a good adherent PVD layer.
This steel can be gas pressure quenched, which reduces distortion caused by heat treatment.

Characteristics

• Case hardening and through hardening steel with excellent hardenability, high mechanical properties and a surface hardness of around 700 HV after carburizing at tempering temperatures of up to 350°C.
• 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 800 HV.

Mechanical properties

Heat
treatment
UTS
(N/mm²)
0,2%
YS
(N/mm²)
A
(%)
KV
(J)
T + F + Rv 300°C 1400 1120 13 120
Tgaz + F + Rv 300°C1350103013110

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

GKH

Steels for nitriding

GKP

Steels for nitriding

FDG

Steels for carburizing