AISI 4140 / 42CrMo4
AISI 4140EN 42CrMo4 / 1.7225JIS SCM440
The benchmark chromium-molybdenum through-hardening engineering steel. Excellent combination of strength, toughness and machinability in the quenched and tempered condition.
- Deep hardenability
- Good machinability in annealed condition
- Available pre-hardened and stress relieved
Available forms & sizes
| Form | Size range |
|---|---|
| Round Bars | 16 - 800 mm dia, forged or peeled |
| Plates | 10 - 200 mm thk |
| Blocks & Profiles | Cut blocks to size |
Chemical composition (%)
| Element | Min | Max |
|---|---|---|
| C | 0.38 | 0.43 |
| Cr | 0.80 | 1.10 |
| Mo | 0.15 | 0.25 |
| Mn | 0.75 | 1.00 |
Mechanical properties
| Property | Value | Unit |
|---|---|---|
| Yield Strength (Q+T) | 650 - 900 | MPa |
| Tensile Strength (Q+T) | 900 - 1100 | MPa |
| Elongation | 12 min | % |
| Hardness (Q+T) | 280 - 320 | HBW |
Physical properties
| Property | Value | Unit |
|---|---|---|
| Density | 7.85 | g/cm3 |
Typical applications
Drive shafts and axles
Gears and couplings
Drill collars and tool joints
Hydraulic cylinder rods
