300M Alloy Steel (4340M)

300M is a vacuum melted low alloy steel with the inclusion of vanadium and a higher silicon composition. It has a very good fatigue strength and resilience. Where fracture toughness and impact strength are crucial, 300M is a great choice.

Applications:

  • Aircraft Landing Gear
  • Airframe Parts
  • Missile Components
  • Motorsport Applications 
Typical Chemical Properties
Minimum Properties Tensile Strength , psi 280,000
  Yield Strength, psi 230,000
  Elongation 7%
  Rockwell Hardness B 311 Max
Chemistry Carbon( C) .38 -.42%
  Chrome (Cr) 0.70-0.95%
  Manganese (Mn) 0.60-.90%
  Molybdenum (Mo) 0.30 - .50%
  Nickel ( Ni) 1.65-2.0%
  Phosphorus (P) P & S - 0.10 %
  Sulphur (S) P & S - 0.10 %
  Silicon (Si) 1.45 - 1.80%
  Vanadium( V) 0.05 - 0.10 %
  Copper ( Cu) 0.35%
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