Through hardening steels
GH4
GH4W
Spécifications
EU
40CrMoV13-9
AIR
40CDV12
ISO Symbol
40CrMoV13-9
ISO Num
1.8523
BS
S132
S134
S138
S134
S138
Composition
C
0.4
Cr
3
Mo
1
V
0.2
Applications
• This steel may be used to produce nitrided parts.
• Parts for the aerospace industry subjected to high stresses.
• This steel is mainly used at a tensile strength of 1400 N/mm2.
Characteristics
• High mechanical strength.
• High hardenability.
• For very thin parts or delicate shapes this grade may be air hardened.
• It may be nitrided in the heat treated condition to obtain a strength from 900 N/mm2 to 1400 N/mm2.
Mechanical properties
| Heat treatment |
UTS (N/mm²) |
0,2% YS (N/mm²) |
A (%) |
KCU (J/cm²) |
|---|---|---|---|---|
| T + Rv 200°C | 1950 | 1450 | 10 | 60 |
| T + Rv 600°C | 1400 | 1150 | 13 | 65 |
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 |