Through hardening steels
CLARMHB7
Spécifications
EU
40NiCrMoV15
Composition
C
0.4
Ni
3.7
Cr
1.6
Mo
0.9
V
0.3
Mn
0.1
Applications
• Large caliber gun barrels and accessories (breech rings, breech blocks, muzzle brakes, etc…).
• Pressure vessels.
• Mechanical parts in the range of YS 1250 to 1400 N/mm2.
Characteristics
• High mechanical characteristics.
• Good impact strength at low temperature.
• High level of hardenability.
• Good characteristics at high temperatures.
• Good temper resistance.
Mechanical properties
| Heat treatment |
UTS (N/mm²) |
0,2% YS (N/mm²) |
A (%) |
KV -40°C (J) |
|---|---|---|---|---|
| T + Rv 560°C | 1480 | 1350 | 13 | 32 |
| T + Rv 585°C | 1350 | 1260 | 14 | 40 |
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 |