300M Alloy Steel (4340M)

300M steel 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 

300M(4340)

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Alloy Grade
Diameter
Manufacture Method
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SKU Description DFARS Manufacture Method Diameter Shape Specification
Sku: A5766 Description: 300M (4340M) AMS 6419 .750 DIA DFARS: Yes Manufacture Method: ROUGH TURNED Diameter: 0.7500 Shape: ROD/BAR ROUND Specification: AMS 6257 AMS 6417
Sku: 92248 Description: 300M (4340M) AMS 6419 1.00 DIA DFARS: Yes Manufacture Method: VACUUM ARC REMELT Diameter: 1.0000 Shape: ROD/BAR ROUND Specification: AMS 6257 AMS 6417
Sku: A1263 Description: 300M (4340M) AMS 6419 1.25 DIA DFARS: Yes Manufacture Method: VACUUM ARC REMELT Diameter: 1.2500 Shape: ROD/BAR ROUND Specification: AMS 6257 AMS 6417
Sku: 92249 Description: 300M (4340M) AMS 6419 1.500 DIA DFARS: Yes Manufacture Method: VACUUM ARC REMELT Diameter: 1.5000 Shape: ROD/BAR ROUND Specification: AMS 6257 AMS 6417
Sku: A1264 Description: 300M (4340M) AMS 6419 1.625 DIA DFARS: No Manufacture Method: VACUUM ARC REMELT Diameter: 1.6250 Shape: ROD/BAR ROUND Specification: AMS 6257 AMS 6417
Sku: A1265 Description: 300M (4340M) AMS 6419 1.750 DIA DFARS: Yes Manufacture Method: VACUUM ARC REMELT Diameter: 1.7500 Shape: ROD/BAR ROUND Specification: AMS 6257 AMS 6417
Sku: A3023 Description: 300M (4340M) AMS 6419 1.875 DIA DFARS: No Manufacture Method: VACUUM ARC REMELT Diameter: 1.8750 Shape: ROD/BAR ROUND Specification: AMS 6257 AMS 6417
Sku: 92512 Description: 300M (4340M) AMS 6419 10.00 DIA DFARS: No Manufacture Method: VACUUM ARC REMELT Diameter: 10.0000 Shape: ROD/BAR ROUND Specification: AMS 6257 AMS 6417
Sku: 92250 Description: 300M (4340M) AMS 6419 2.000 DIA DFARS: Yes Manufacture Method: VACUUM ARC REMELT Diameter: 2.0000 Shape: ROD/BAR ROUND Specification: AMS 6257 AMS 6417
Sku: A1266 Description: 300M (4340M) AMS 6419 2.250 DIA DFARS: Yes Manufacture Method: VACUUM ARC REMELT Diameter: 2.2500 Shape: ROD/BAR ROUND Specification: AMS 6257 AMS 6417

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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%