
300M Alloy Steel is a vacuum-melted, low-alloy steel that is essentially a modification of AISI 4340 with added Silicon (approx. 1.60%). This addition allows the material to be tempered at higher temperatures while maintaining extreme hardness and preventing embrittlement, resulting in one of the highest strength-to-weight ratios of any low-alloy steel.
| Feature | Details |
| Common Name | 300M / AISI E4340M / AMS 6417 / AMS 6419 |
| Chemical Composition | Nickel (1.65% 2.00%), Silicon (1.45% 1.80%), Vanadium (0.05% min) |
| Tensile Strength | $1860 - 2100 \text{ MPa}$ ($270,000 - 300,000 \text{ psi}$) |
| Fracture Toughness | Excellent resistance to crack propagation at high strength levels |
| Melting Process | Vacuum Induction Melted (VIM) or Vacuum Arc Remelted (VAR) |
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