4340 is nickel-chromium-molybdenum alloy steel. It is ideal for highly stressed parts, and it can attain much deeper hardenability than 4100 series steel. 4340 also has excellent non-distorting properties for an alloy steel, with high fatigue/tensile ratio and the capability to maintain strength, ductility, and toughness at relatively high temperatures. Meets MIL-S-5000, AMS-6415, and others.
AED stocks several sizes of 4340 round bar, generally in the cold finished and normalized condition. Other sizes and conditions, as well as hex, flat and square bar may also be available upon request.
Technical Mechanical Properties
| Property | Annealed |
|---|---|
| Tensile Strength (psi) | 110,000 |
| Yield Point (psi) | 66,000 |
| Elongation % in 2 | 23 |
| Reduction of Area (%) | 49 |
| Brinell Hardness | 197 |
Related Documents
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