Steels for carburizing
FADH
FADHW
FADHYW
Spécifications
EU
14NiCrMo13-4
USA
UNS: K43214
AMS
6547
6548
6549
6548
6549
AIR
16NCD13
ISO Symbol
14NiCrMo13-4
ISO Num
1.6657
WL
1.6657
1.6658
1.6658
BS
S157
Composition
C
0.16
Ni
3.2
Cr
1
Mo
0.25
Applications
• Various heavily stressed carburized and non carburized mechanical parts.
• Parts for the aerospace industry.
Characteristics
• After carburizing, quenching and tempering, the surface hardness is around 700 HV.
• Good toughness of the carburized layer.
• High hardenability.
• Good mechanical properties.
• Good resistance to fatigue.
Mechanical properties
| Heat treatment |
UTS (N/mm²) |
0,2% YS (N/mm²) |
A (%) |
KV (J) |
|---|---|---|---|---|
| T + Rv 150°C | 1350 | 1000 | 14 | 140 |
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 |