AISI 4340 Steel — Specifications & Listings
SAE/AISI — Nickel chrome molybdenum high strength alloy steel
Grade Details
| Grade | AISI 4340 |
| Standard | SAE/AISI |
| Description | Nickel chrome molybdenum high strength alloy steel |
| Applications | Aircraft parts, heavy duty gears, crankshafts, high tensile bolts |
Equivalent / Similar Grades
Chemical Composition (%)
| C |
Mn |
Cr |
Mo |
Ni |
Si |
| 0.38–0.43 |
0.60–0.80 |
0.70–0.90 |
0.20–0.30 |
1.65–2.00 |
0.15–0.35 |
Mechanical Properties
| Tensile Strength |
1000–1200 MPa |
| Yield Strength |
≥830 MPa |
| Elongation |
≥12% |
| Hardness |
285–341 HB |
Typical Available Sizes
| Round Bar |
20mm–400mm dia |
| Flat Bar |
25×10mm–300×80mm |
Sizes are indicative. Contact seller for exact availability.
Active AISI 4340 Listings on M-EX