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 an excellent choice. It can be machined by all customary methods. This material is available in both vacuum melt (VM) and air melt (AM).
We sell our trademark material Durelloy that is made to last and perform better than standard 4340.
| Minimum Properties | Tensile Strength, psi | 140,000 |
| Yield Strength, psi | 120,000 | |
| Elongation | 14% | |
| Rockwell 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% |
Not sure what you are looking for? Contact Ameralloy Steel an ISO 9001 certified supplier that specializes in finding hard-to-find Stainless and Alloys. Along with our proprietary grades Amera-Braze, Durelloy, and Dura-Krome. Our knowledgeable sales team will help you find what you are looking for. With many shapes, sizes, and material grades available, we can help you find what you are looking for. The most common items stocked are Tube, Pipe, Sheet, Plate, Hex bar, Square bar, Round bar, Threaded bar, Pump Shaft, and Millimeter sizes. We offer added fabrication services. Contact us now for the current price and delivery.