Steel 300M
A646 - K44220
300M steel is a high-strength alloy, derived from AISI 4340 steel with the addition of silicon, vanadium, and slightly more carbon and molybdenum. This material stands out for its combination of strength, toughness, fatigue resistance, and ductility. Its characteristics allow it to withstand the extreme conditions encountered in flight, such as temperature variations, pressure cycles, and vibrations. These properties make 300M particularly well-suited for critical applications in the aerospace and defense sectors, such as landing gears and structural components.
Available shapes :
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Chemical composition of 300M
The variations in its chemical composition for aerospace.
| % | C Carbon | Cr Chromium | Cu Copper | Mn Manganese | Mo Molybdenum | Ni Nickel | P Phosphorus | S Sulfur | Si Silicon | V Vanadium |
|---|---|---|---|---|---|---|---|---|---|---|
| Min. | 0.40 | 0.70 | <0.00 | 0.65 | 0.35 | 1.65 | <0.00 | <0.00 | 1.45 | 0.05 |
| Max. | 0.45 | 0.95 | 0.35 | 0.90 | 0.50 | 2.00 | 0.010 | 0.010 | 1.80 | 0.10 |
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Key properties
The most remarkable properties of this steel alloy
Ductility
≥4%
Tensile Strength
1930-2068 MPa
Yield Strength
≥1586 MPa
Brinell Hardness
≤99
How 300M is used in aerospace
The practical applications of this steel in aircraft construction.
Landing gears
Designed to withstand the severe shocks of landings and takeoffs, landing gears require strong fatigue resistance, such as that provided by 300M steel. Long a competitor of 35NCD16, 300M is now preferred for these applications.
Drive shafts
Connecting engines to propellers or rotors, aircraft drive shafts demand exceptional torsion and fatigue resistance. 300M steel meets these criteria, ensuring efficient power transmission to helicopters and turboprop engines.
Gears and high-strength bolts
The high-strength 300M steel is widely used in critical applications. Its exceptional resistance to wear, high loads, and tensile stress makes it suitable for gears and fasteners in aircraft. Resistant to vibrations, temperature cycles, and high pressures, 300M steel ensures the reliability of propulsion systems and structural components.
Optimizing the use of 300M : treatments, regulations, and options.
Applications of
300M steel
How it is used in various industries.
