Alloy Steel 4640
Material Data Sheet
AISI 4640 alloy steels are characterized by high toughness, strength, and corrosion resistance. The following material data sheet will discuss in detail about AISI 4640 alloy steel.
Chemical Composition
| Chemistry | Content(%) |
|---|---|
| Iron, Fe | 96.04 – 96.89 |
| Nickel, Ni | 1.65 – 2.00 |
| Manganese, Mn | 0.60 – 0.80 |
| Carbon, C | 0.38 – 0.43 |
| Silicon, Si | 0.20 – 0.35 |
| Molybdenum, Mo | 0.20 – 0.30 |
| Phosphorus, P | ≤ 0.04 |
| Sulfur, S | ≤ 0.04 |
Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.75 g/cm3 | 0.280 lb/in3 |
Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Hardness, Brinell | 390 | 390 |
| Tensile Strength, Ultimate | 1276 MPa | 185100 psi |
| Tensile Strength, Yield | 1103 MPa | 160000 psi |
| Elongation at Break | 14% | 14% |
| Modulus of Elasticity | 201 – 209 GPa | 29200 – 30300 ksi |
| Bulk Modulus | 160 – 170 GPa | 23200 – 24700 ksi |
| Poissons Ratio | 0.27 – 0.30 | 0.27 – 0.30 |
| Shear Modulus | 81.0 – 82.0 GPa | 11700 – 11900 ksi |
Applications
Alloy Steel 4640 is used in the following application areas:
- Landing Gear Bushings
- Strut Bearings
- Main Pistons
- Trunnion Bearings
- Actuator Parts
- Valve Seats
- Valve Guides
- Pump Shafts
- Pump Gears
- Bearings
- Nuts
- BOP Components
- Pump Components
- Bolts
- Propellers
