4340 Alloy Bar

4340 alloy steel bar is used heavily in the aerospace industry due to its ultra-high strength. When heat treated it is known for its toughness while preserving good fatigue strength. For highly stressed parts it is excellent choice. It can be machined by all customary methods. This material is available in both vacuum melt (VM) and air melt (AM).

Applications:

  • Aircraft Landing Gear
  • Power Transmission Gears
  • Structural Use Applications

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SKU Description DFARS Manufacture Method Diameter Shape Specification
Sku: A5796 Description: 4340 N&T VAC AMS6414 .375 DIA DFARS: No Manufacture Method: VACUUM ARC REMELT Diameter: 0.3750 Shape: ROD/BAR ROUND Specification: AMS6414
Sku: 11465 Description: 4340 AIR MELT CD AMS6415 .500DI DFARS: Yes Manufacture Method: Air Melt Diameter: 0.5000 Shape: ROD/BAR ROUND Specification: AMS6415
Sku: A5797 Description: 4340 N&T VAC AMS6414 .625 DIA DFARS: No Manufacture Method: VACUUM ARC REMELT Diameter: 0.6250 Shape: ROD/BAR ROUND Specification: AMS6414
Sku: A5798 Description: 4340 N&T VAC AMS6414 .6875 DIA DFARS: No Manufacture Method: VACUUM ARC REMELT Diameter: 0.6875 Shape: ROD/BAR ROUND Specification: AMS6414
Sku: 11464 Description: 4340 AIR MELT Cf AMS6415 .750DI DFARS: Yes Manufacture Method: Air Melt Diameter: 0.7500 Shape: ROD/BAR ROUND Specification: AMS6415
Sku: 11466 Description: 4340 AIR MELT AMS6415 .875DI DFARS: Yes Manufacture Method: Air Melt Diameter: 0.8750 Shape: ROD/BAR ROUND Specification: AMS6415
Sku: A5799 Description: 4340 N&T VAC AMS6414 .875 DIA DFARS: No Manufacture Method: VACUUM ARC REMELT Diameter: 0.8750 Shape: ROD/BAR ROUND Specification: AMS6414
Sku: 07971 Description: 4340 N&T VAC MELT AMS 6414 1.000DIA DFARS: Yes Manufacture Method: VACUUM ARC REMELT Diameter: 1.0000 Shape: ROD/BAR ROUND Specification: AMS6414
Sku: 07977 Description: 4340 AIR MELT AMS 6415 1.00 DIA DFARS: Yes Manufacture Method: Air Melt Diameter: 1.0000 Shape: ROD/BAR ROUND Specification: AMS6415
Sku: 71350 Description: 4340 REC BAR 1 X 2.5 DFARS: No Manufacture Method: Air Melt Diameter: 1.0000 Shape: BAR RECTANGULAR Specification: AMS-S-5000

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Typical Chemical Properties
Minimum Properties Tensile Strength , psi 140,000
  Yield Strength, psi 120,000
  Elongation 14%
  Hardness Rc 32/39
Chemistry Carbon( C) .38 -.43%
  Chrome (Cr) 0.70- 0.90%
  Manganese (Mn) 0.60-0.80%
  Molybdenum (Mo) 0.20 - .30%
  Nickel ( Ni) 1.65-2.0%
  Phosphorus (P) 0.030%
  Sulphur (S) 0.040%
  Silicon (Si) 0.15- 0.35%