Alloy Steel 300M
Material Data Sheet
300M is a low alloy, vacuum melted steel of very high strength and hardenability. Essentially it is a modified AISI 4340 steel with silicon, vanadium, and slightly more carbon and molybdenum. 300M has a very good combination of strength in the 280-305 KSI range (1930–2100 MPa). It is a through hardening alloy with a combination of high toughness, fatigue strength, and good ductility.
Chemical Composition
| Element | Content (%) |
|---|---|
| Iron, Fe | 94.0 |
| Nickel, Ni | 1.65 – 2.0 |
| Silicon, Si | 1.45 – 1.8 |
| Chromium, Cr | 0.7 – 0.95 |
| Manganese, Mn | 0.6 – 0.9 |
| Titanium, Ti | 0.3 – 0.5 |
| Molybdenum, Mo | 0.3 – 0.65 |
Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.87 g/cc | 0.284 lb/in³ |
| Melting Point | 1422 °C | 2590 °F |
Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile Strength, Ultimate | 1931 MPa | 280 ksi |
| Tensile Strength, Yield | 1586 MPa | 230 ksi | Modulus of Elasticity | 205 GPa | 29700 ksi |
| Poissons Ratio | 0.28 | 0.28 |
| Shear Modulus | 80.0 GPa | 11600 ksi |
Applications
Alloy Steel 300M is used in the following application areas:
- Aircraft landing gear
- High strength bolts
- Missile components
- Motorsport applications
- Driveshafts
- Flap tracks
- Airframe parts
