Through hardening steels

GH4

GH4W

Spécifications

EU
40CrMoV13-9
AIR
40CDV12
ISO Symbol
40CrMoV13-9
ISO Num
1.8523
BS
S132
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°C140011501365

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

FDMA

Through hardening steels

819B

Through hardening steels

GKP

Steels for nitriding